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From: Kirill Shcherbatov <kshcherbatov@tarantool.org>
To: tarantool-patches@freelists.org, vdavydov.dev@gmail.com
Cc: Kirill Shcherbatov <kshcherbatov@tarantool.org>
Subject: [PATCH v5 4/4] box: introduce multikey indexes in memtx
Date: Mon,  6 May 2019 14:57:41 +0300	[thread overview]
Message-ID: <bb1e8c779aae2538c797d45668f190ba46ce438e.1557142159.git.kshcherbatov@tarantool.org> (raw)
In-Reply-To: <cover.1557142159.git.kshcherbatov@tarantool.org>

- In the case of multikey index arises an ambiguity: which key
  should be used in the comparison. The previously introduced
  comparison hints act as an non-negative numeric index of key
  to use,
- Memtx B+ tree replace and build_next methods have been
  patched to insert the same tuple multiple times by different
  logical indexes of the key in the array,
- Map fields have been expanded service areas "extent" that
  contain an offset of multikey index keys by additional logical
  index.

Part of #1257

@TarantoolBot document
Title: introduce multikey indexes in memtx
Any JSON index in which at least one partition contains "[*]"
- array index placeholder sign is called "Multikey".
Such indexes allows you to automatically index set of documents
having same document structure.

Multikey indexes design have a number of restrictions that must
be taken into account:
 - it cannot be primary because of the ambiguity arising from
   it's definition (primary index requires the one unique key
   that identify tuple),
 - if some node in the JSON tree of all defined indexes contains
   an array index placeholder [*], no other JSON path can use an
   explicit JSON index on it's nested field.
 - it support "unique" semantics, but it's uniqueness a little
   different from conventional indexes: you may insert a tuple
   in which the same key occurs multiple times in a unique
   multikey index, but you cannot insert a tuple when any of its
   keys is in some other tuple stored in space,
 - the unique multikey index "duplicate" conflict occurs when
   the sets of extracted keys have a non-empty logical
   intersection
 - to identify the different keys by which a given data tuple is
   indexed, each key is assigned a logical sequence number in
   the array defined with array index placeholder [*] in index
   (such array is called multikey index root),
 - no index partition can contain more than one array index
   placeholder sign [*] in it's JSON path,
 - all parts containing JSON paths with array index placeholder
   [*] must have the same (in terms of json tokens) prefix
   before this placeholder sign.

Example 1:
s = box.schema.space.create('clients')
s:format({{name='name', type='string'}, {name='phone', type='array'}})
name_idx = s:create_index('name_idx', {parts = {{'name', 'string'}}})
phone_idx = s:create_index('phone_idx', {parts = {{'phone[*]',
'string'}}})
s:insert({"Jorge", {"911", "89457609234"}})
s:insert({"Bob", {"81239876543"}})

phone_idx:get("911")
---
- ['Jorge', ['911', '89457609234']]
...

Example 2:
s = box.schema.space.create('withdata')
pk = s:create_index('pk')
parts = {
	{2, 'str', path = 'data[*].name'},
        {2, 'str', path = 'data[*].extra.phone'}
}
idx = s:create_index('idx', {parts = parts})
s:insert({1, {data = {{name="A", extra={phone="111"}},
                      {name="B", extra={phone="111"}}},
             garbage = 1}}
idx:get({'A', '111'})
---
 src/box/errcode.h             |   1 +
 src/box/field_map.c           |  59 ++-
 src/box/field_map.h           | 138 +++++-
 src/box/index_def.c           |   5 +
 src/box/key_def.c             | 142 ++++--
 src/box/key_def.h             |  34 ++
 src/box/memtx_engine.c        |   2 +
 src/box/memtx_space.c         |  18 +
 src/box/memtx_tree.c          | 240 ++++++++++-
 src/box/sql.c                 |   3 +-
 src/box/tuple.c               |  27 +-
 src/box/tuple.h               |  79 +++-
 src/box/tuple_compare.cc      | 152 +++++--
 src/box/tuple_compare.h       |  10 +
 src/box/tuple_extract_key.cc  |   5 +-
 src/box/tuple_format.c        | 187 ++++++--
 src/box/tuple_format.h        |  37 +-
 src/box/vinyl.c               |   7 +
 test/box/misc.result          |   1 +
 test/engine/engine.cfg        |   3 +
 test/engine/json.result       |  13 -
 test/engine/json.test.lua     |   7 -
 test/engine/multikey.result   | 789 ++++++++++++++++++++++++++++++++++
 test/engine/multikey.test.lua | 206 +++++++++
 24 files changed, 2025 insertions(+), 140 deletions(-)
 create mode 100644 test/engine/multikey.result
 create mode 100644 test/engine/multikey.test.lua

diff --git a/src/box/errcode.h b/src/box/errcode.h
index 3f8cb8e0e..9c0a8e72c 100644
--- a/src/box/errcode.h
+++ b/src/box/errcode.h
@@ -246,6 +246,7 @@ struct errcode_record {
 	/*191 */_(ER_SQL_PARSER_LIMIT,		"%s %d exceeds the limit (%d)") \
 	/*192 */_(ER_INDEX_DEF_UNSUPPORTED,	"%s are prohibited in an index definition") \
 	/*193 */_(ER_CK_DEF_UNSUPPORTED,	"%s are prohibited in a CHECK constraint definition") \
+	/*194 */_(ER_MULTIKEY_INDEX_MISMATCH,	"Field %s is used as multikey in one index and as single key in another") \
 
 /*
  * !IMPORTANT! Please follow instructions at start of the file
diff --git a/src/box/field_map.c b/src/box/field_map.c
index 690aa461d..5d25e3032 100644
--- a/src/box/field_map.c
+++ b/src/box/field_map.c
@@ -37,6 +37,7 @@ field_map_builder_create(struct field_map_builder *builder,
 			 uint32_t minimal_field_map_size,
 			 struct region *region)
 {
+	builder->extents_size = 0;
 	builder->slot_count = minimal_field_map_size / sizeof(uint32_t);
 	if (minimal_field_map_size == 0) {
 		builder->slots = NULL;
@@ -53,9 +54,63 @@ field_map_builder_create(struct field_map_builder *builder,
 	return 0;
 }
 
+struct field_map_builder_slot_extent *
+field_map_builder_slot_extent_new(struct field_map_builder *builder,
+				  int32_t offset_slot, uint32_t multikey_count,
+				  struct region *region)
+{
+	struct field_map_builder_slot_extent *extent;
+	assert(!builder->slots[offset_slot].has_extent);
+	uint32_t sz = sizeof(struct field_map_builder_slot_extent) +
+		      multikey_count * sizeof(uint32_t);
+	extent = region_alloc(region, sz);
+	if (extent == NULL) {
+		diag_set(OutOfMemory, sz, "region", "extent");
+		return NULL;
+	}
+	memset(extent, 0, sz);
+	extent->size = multikey_count;
+	builder->slots[offset_slot].extent = extent;
+	builder->slots[offset_slot].has_extent = true;
+	builder->extents_size += sz;
+	return extent;
+}
+
 void
 field_map_build(struct field_map_builder *builder, char *buffer)
 {
-	uint32_t field_map_size = field_map_build_size(builder);
-	memcpy(buffer, (char *)builder->slots - field_map_size, field_map_size);
+	/*
+	 * To initialize the field map and its extents, prepare
+	 * the following memory layout with pointers:
+	 *
+	 *                      offset
+	 * buffer       +---------------------+
+	 * |            |                     |
+	 * [extentK] .. [extent1][[slotN]..[slot2][slot1]]
+	 * |            |                               |
+	 * |extent_wptr |        |                      |field_map
+	 * ->           ->                              <-
+	 *
+	 * The buffer size is assumed to be sufficient to write
+	 * field_map_build_size(builder) bytes there.
+	 */
+	uint32_t *field_map =
+		(uint32_t *)(buffer + field_map_build_size(builder));
+	char *extent_wptr = buffer;
+	for (int32_t i = -1; i >= -(int32_t)builder->slot_count; i--) {
+		if (!builder->slots[i].has_extent) {
+			field_map[i] = builder->slots[i].offset;
+			continue;
+		}
+		struct field_map_builder_slot_extent *extent =
+						builder->slots[i].extent;
+		/** Retrive memory for the extent. */
+		uint32_t sz = sizeof(struct field_map_builder_slot_extent) +
+			      extent->size * sizeof(uint32_t);
+		field_map[i] =
+			(uint32_t)((char *)extent_wptr - (char *)field_map);
+		memcpy(extent_wptr, extent, sz);
+		extent_wptr += sz;
+	}
+	assert(extent_wptr == buffer + builder->extents_size);
 }
diff --git a/src/box/field_map.h b/src/box/field_map.h
index f6c653030..0fd35c3e1 100644
--- a/src/box/field_map.h
+++ b/src/box/field_map.h
@@ -32,8 +32,10 @@
  */
 #include <assert.h>
 #include <stdint.h>
+#include <stddef.h>
 
 struct region;
+struct field_map_builder_slot;
 
 /**
  * A field map is a special area is reserved before tuple's
@@ -46,13 +48,15 @@ struct region;
  * offset_slot(s) is performed on tuple_format creation on index
  * create or alter (see tuple_format_create()).
  *
- *              4b          4b       MessagePack data.
- *           +------+----+------+---------------------------+
- *    tuple: | offN | .. | off1 | header ..|key1|..|keyN|.. |
- *           +--+---+----+--+---+---------------------------+
- *           |     ...    |                 ^       ^
- *           |            +-----------------+       |
- *           +--------------------------------------+
+ *        4b   4b      4b          4b       MessagePack data.
+ *       +-----------+------+----+------+------------------------+
+ *tuple: |cnt|off1|..| offN | .. | off1 | header ..|key1|..|keyN||
+ *       +-----+-----+--+---+----+--+---+------------------------+
+ * ext1  ^     |        |   ...     |                 ^       ^
+ *       +-----|--------+           |                 |       |
+ * indirection |                    +-----------------+       |
+ *             +----------------------------------------------+
+ *             (offset_slot = N, extent_slot = 1) --> offset
  *
  * This field_map_builder class is used for tuple field_map
  * construction. It encapsulates field_map build logic and size
@@ -60,6 +64,14 @@ struct region;
  *
  * Each field offset is a positive number, except the case when
  * a field is not in the tuple. In this case offset is 0.
+ *
+ * In case of multikey index, the slot may refer to the
+ * "field_map_extent" sequence that contains an additional
+ * sequence of length defined before (the count of keys in the
+ * multikey index for given tuple). In such case offset slot
+ * represents int32_t negative value - the offset relative to
+ * the field_map pointer. The i-th extent's slot contains the
+ * positive offset of the i-th key field of the multikey index.
  */
 struct field_map_builder {
 	/**
@@ -67,12 +79,60 @@ struct field_map_builder {
 	 * Its elements are accessible by negative indexes
 	 * that coinciding with offset_slot(s).
 	 */
-	uint32_t *slots;
+	struct field_map_builder_slot *slots;
 	/**
 	 * The count of slots in field_map_builder::slots
 	 * allocation.
 	 */
 	uint32_t slot_count;
+	/**
+	 * Total size of memory is allocated for field_map
+	 * extents.
+	 */
+	uint32_t extents_size;
+};
+
+/**
+ * Internal stucture representing field_map extent.
+ * (see field_map_builder description).
+ */
+struct field_map_builder_slot_extent {
+	/**
+	 * Count of field_map_builder_slot_extent::offset[]
+	 * elements.
+	 */
+	uint32_t size;
+	/** Data offset in tuple array. */
+	uint32_t offset[0];
+};
+
+/**
+ * Instead of using uint32_t offset slots directly the
+ * field_map_builder uses this structure as a storage atom.
+ * When there is a need to initialize an extent, the
+ * field_map_builder allocates a new memory chunk and sets
+ * field_map_builder_slot::pointer (instead of real field_map
+ * reallocation).
+ *
+ * On field_map_build, all of the field_map_builder_slot_extent(s)
+ * are dumped to the same memory chunk that the regular field_map
+ * slots and corresponding slots are initialized with negative
+ * extent offset.
+ *
+ * The allocated memory is accounted for in extents_size.
+ */
+struct field_map_builder_slot {
+	/**
+	 * True when this slot must be interpret as
+	 * extent pointer.
+	 */
+	bool has_extent;
+	union {
+		/** Data offset in tuple. */
+		uint32_t offset;
+		/** Pointer to field_map extent. */
+		struct field_map_builder_slot_extent *extent;
+	};
 };
 
 /**
@@ -82,9 +142,25 @@ struct field_map_builder {
  * When a field is not in the data tuple, its offset is 0.
  */
 static inline uint32_t
-field_map_get_offset(const uint32_t *field_map, int32_t offset_slot)
+field_map_get_offset(const uint32_t *field_map, int32_t offset_slot,
+		     int multikey_idx)
 {
-	return field_map[offset_slot];
+	uint32_t offset;
+	if (multikey_idx >= 0 && field_map[offset_slot] > 0) {
+		assert((int32_t)field_map[offset_slot] < 0);
+		/**
+		 * The field_map extent has the following
+		 * structure: [size=N|slot1|slot2|..|slotN]
+		 */
+		uint32_t *extent = (uint32_t *)((char *)field_map +
+					(int32_t)field_map[offset_slot]);
+		if ((uint32_t)multikey_idx >= extent[0])
+			return 0;
+		offset = extent[multikey_idx + 1];
+	} else {
+		offset = field_map[offset_slot];
+	}
+	return offset;
 }
 
 /**
@@ -104,20 +180,53 @@ field_map_builder_create(struct field_map_builder *builder,
 			 uint32_t minimal_field_map_size,
 			 struct region *region);
 
+/**
+ * Internal function to allocate field map extent by offset_slot
+ * and count of multikey keys.
+ */
+struct field_map_builder_slot_extent *
+field_map_builder_slot_extent_new(struct field_map_builder *builder,
+				  int32_t offset_slot, uint32_t multikey_count,
+				  struct region *region);
+
 /**
  * Set data offset for a field identified by unique offset_slot.
  *
+ * When multikey_idx > 0 this routine initialize corresponding
+ * field_map_builder_slot_extent is identified by multikey_idx
+ * and multikey_count. Performs allocation on region when
+ * required.
+ *
  * The offset_slot argument must be negative and offset must be
  * positive (by definition).
  */
-static inline void
+static inline int
 field_map_builder_set_slot(struct field_map_builder *builder,
-			   int32_t offset_slot, uint32_t offset)
+			   int32_t offset_slot, uint32_t offset,
+			   int32_t multikey_idx, uint32_t multikey_count,
+			   struct region *region)
 {
 	assert(offset_slot < 0);
 	assert((uint32_t)-offset_slot <= builder->slot_count);
 	assert(offset > 0);
-	builder->slots[offset_slot] = offset;
+	assert(multikey_idx < (int32_t)multikey_count);
+	if (multikey_idx == -1) {
+		builder->slots[offset_slot].offset = offset;
+	} else {
+		struct field_map_builder_slot_extent *extent;
+		if (builder->slots[offset_slot].has_extent) {
+			extent = builder->slots[offset_slot].extent;
+			assert(extent != NULL);
+			assert(extent->size == multikey_count);
+		} else {
+			extent = field_map_builder_slot_extent_new(builder,
+					offset_slot, multikey_count, region);
+			if (extent == NULL)
+				return -1;
+		}
+		extent->offset[multikey_idx] = offset;
+	}
+	return 0;
 }
 
 /**
@@ -126,7 +235,8 @@ field_map_builder_set_slot(struct field_map_builder *builder,
 static inline uint32_t
 field_map_build_size(struct field_map_builder *builder)
 {
-	return builder->slot_count * sizeof(uint32_t);
+	return builder->slot_count * sizeof(uint32_t) +
+	       builder->extents_size;
 }
 
 /**
diff --git a/src/box/index_def.c b/src/box/index_def.c
index 476d9f8d3..28de89274 100644
--- a/src/box/index_def.c
+++ b/src/box/index_def.c
@@ -291,6 +291,11 @@ index_def_is_valid(struct index_def *index_def, const char *space_name)
 			 space_name, "too many key parts");
 		return false;
 	}
+	if (index_def->iid == 0 && key_def_is_multikey(index_def->key_def)) {
+		diag_set(ClientError, ER_MODIFY_INDEX, index_def->name,
+			 space_name, "primary key cannot be multikey");
+		return false;
+	}
 	for (uint32_t i = 0; i < index_def->key_def->part_count; i++) {
 		assert(index_def->key_def->parts[i].type < field_type_MAX);
 		if (index_def->key_def->parts[i].fieldno > BOX_INDEX_FIELD_MAX) {
diff --git a/src/box/key_def.c b/src/box/key_def.c
index d07bbe8bc..d9e8e7a17 100644
--- a/src/box/key_def.c
+++ b/src/box/key_def.c
@@ -104,6 +104,10 @@ key_def_dup(const struct key_def *src)
 		size_t path_offset = src->parts[i].path - (char *)src;
 		res->parts[i].path = (char *)res + path_offset;
 	}
+	if (src->multikey_path != NULL) {
+		size_t path_offset = src->multikey_path - (char *)src;
+		res->multikey_path = (char *)res + path_offset;
+	}
 	return res;
 }
 
@@ -138,7 +142,79 @@ key_def_set_func(struct key_def *def)
 	key_def_set_extract_func(def);
 }
 
-static void
+static int
+key_def_set_part_path(struct key_def *def, uint32_t part_no, const char *path,
+		      uint32_t path_len, char **path_pool)
+{
+	struct key_part *part = &def->parts[part_no];
+	if (path == NULL) {
+		part->path = NULL;
+		part->path_len = 0;
+		return 0;
+	}
+	assert(path_pool != NULL);
+	part->path = *path_pool;
+	*path_pool += path_len;
+	memcpy(part->path, path, path_len);
+	part->path_len = path_len;
+
+	/*
+	 * Test whether this key_part has array index
+	 * placeholder [*] (i.e. is a part of multikey index
+	 * definition).
+	 */
+	int multikey_path_len =
+		json_path_multikey_offset(path, path_len, TUPLE_INDEX_BASE);
+	if ((uint32_t) multikey_path_len == path_len)
+		return 0;
+
+	/*
+	 * In case of multikey index key_parts must have the
+	 * same JSON prefix.
+	 */
+	if (def->multikey_path == NULL) {
+		/*
+		 * Keep the index of the first multikey key_part
+		 * and the length of JSON path substring to the
+		 * array index placeholder sign [*].
+		 */
+		def->multikey_path = part->path;
+		def->multikey_fieldno = part->fieldno;
+		def->multikey_path_len = (uint32_t) multikey_path_len;
+	} else if (json_path_cmp(path, multikey_path_len, def->multikey_path,
+				 def->multikey_path_len,
+				 TUPLE_INDEX_BASE) != 0) {
+		diag_set(ClientError, ER_WRONG_INDEX_OPTIONS,
+			 part_no + TUPLE_INDEX_BASE,
+			 "incompatable multikey index path");
+		return -1;
+	}
+
+	/* Skip JSON_TOKEN_ANY token. */
+	struct json_lexer lexer;
+	struct json_token token;
+	json_lexer_create(&lexer, path + multikey_path_len,
+			  path_len - multikey_path_len, TUPLE_INDEX_BASE);
+	json_lexer_next_token(&lexer, &token);
+	assert(token.type == JSON_TOKEN_ANY);
+
+	/* The rest of JSON path couldn't be multikey. */
+	int multikey_path_suffix_len =
+		path_len - multikey_path_len - lexer.offset;
+	if (json_path_multikey_offset(path + multikey_path_len + lexer.offset,
+				      multikey_path_suffix_len,
+				      TUPLE_INDEX_BASE) !=
+	    multikey_path_suffix_len) {
+		diag_set(ClientError, ER_WRONG_INDEX_OPTIONS,
+			 part_no + TUPLE_INDEX_BASE,
+			 "no more than one array index placeholder [*] is "
+			 "allowed in JSON path");
+		return -1;
+	}
+	return 0;
+}
+
+static int
 key_def_set_part(struct key_def *def, uint32_t part_no, uint32_t fieldno,
 		 enum field_type type, enum on_conflict_action nullable_action,
 		 struct coll *coll, uint32_t coll_id,
@@ -158,17 +234,8 @@ key_def_set_part(struct key_def *def, uint32_t part_no, uint32_t fieldno,
 	def->parts[part_no].sort_order = sort_order;
 	def->parts[part_no].offset_slot_cache = offset_slot;
 	def->parts[part_no].format_epoch = format_epoch;
-	if (path != NULL) {
-		assert(path_pool != NULL);
-		def->parts[part_no].path = *path_pool;
-		*path_pool += path_len;
-		memcpy(def->parts[part_no].path, path, path_len);
-		def->parts[part_no].path_len = path_len;
-	} else {
-		def->parts[part_no].path = NULL;
-		def->parts[part_no].path_len = 0;
-	}
 	column_mask_set_fieldno(&def->column_mask, fieldno);
+	return key_def_set_part_path(def, part_no, path, path_len, path_pool);
 }
 
 struct key_def *
@@ -203,10 +270,14 @@ key_def_new(const struct key_part_def *parts, uint32_t part_count)
 			coll = coll_id->coll;
 		}
 		uint32_t path_len = part->path != NULL ? strlen(part->path) : 0;
-		key_def_set_part(def, i, part->fieldno, part->type,
-				 part->nullable_action, coll, part->coll_id,
-				 part->sort_order, part->path, path_len,
-				 &path_pool, TUPLE_OFFSET_SLOT_NIL, 0);
+		if (key_def_set_part(def, i, part->fieldno, part->type,
+				     part->nullable_action, coll, part->coll_id,
+				     part->sort_order, part->path, path_len,
+				     &path_pool, TUPLE_OFFSET_SLOT_NIL,
+				     0) != 0) {
+			key_def_delete(def);
+			return NULL;
+		}
 	}
 	assert(path_pool == (char *)def + sz);
 	key_def_set_func(def);
@@ -256,11 +327,14 @@ box_key_def_new(uint32_t *fields, uint32_t *types, uint32_t part_count)
 	key_def->unique_part_count = part_count;
 
 	for (uint32_t item = 0; item < part_count; ++item) {
-		key_def_set_part(key_def, item, fields[item],
-				 (enum field_type)types[item],
-				 ON_CONFLICT_ACTION_DEFAULT,
-				 NULL, COLL_NONE, SORT_ORDER_ASC, NULL, 0,
-				 NULL, TUPLE_OFFSET_SLOT_NIL, 0);
+		if (key_def_set_part(key_def, item, fields[item],
+				     (enum field_type)types[item],
+				     ON_CONFLICT_ACTION_DEFAULT, NULL,
+				     COLL_NONE, SORT_ORDER_ASC, NULL, 0, NULL,
+				     TUPLE_OFFSET_SLOT_NIL, 0) != 0) {
+			key_def_delete(key_def);
+			return NULL;
+		}
 	}
 	key_def_set_func(key_def);
 	return key_def;
@@ -685,11 +759,15 @@ key_def_merge(const struct key_def *first, const struct key_def *second)
 	part = first->parts;
 	end = part + first->part_count;
 	for (; part != end; part++) {
-		key_def_set_part(new_def, pos++, part->fieldno, part->type,
-				 part->nullable_action, part->coll,
-				 part->coll_id, part->sort_order, part->path,
-				 part->path_len, &path_pool,
-				 part->offset_slot_cache, part->format_epoch);
+		if (key_def_set_part(new_def, pos++, part->fieldno, part->type,
+				     part->nullable_action, part->coll,
+				     part->coll_id, part->sort_order,
+				     part->path, part->path_len, &path_pool,
+				     part->offset_slot_cache,
+				     part->format_epoch) != 0) {
+			key_def_delete(new_def);
+			return NULL;
+		}
 	}
 
 	/* Set-append second key def's part to the new key def. */
@@ -698,11 +776,15 @@ key_def_merge(const struct key_def *first, const struct key_def *second)
 	for (; part != end; part++) {
 		if (!key_def_can_merge(first, part))
 			continue;
-		key_def_set_part(new_def, pos++, part->fieldno, part->type,
-				 part->nullable_action, part->coll,
-				 part->coll_id, part->sort_order, part->path,
-				 part->path_len, &path_pool,
-				 part->offset_slot_cache, part->format_epoch);
+		if (key_def_set_part(new_def, pos++, part->fieldno, part->type,
+				     part->nullable_action, part->coll,
+				     part->coll_id, part->sort_order,
+				     part->path, part->path_len, &path_pool,
+				     part->offset_slot_cache,
+				     part->format_epoch) != 0) {
+			key_def_delete(new_def);
+			return NULL;
+		}
 	}
 	assert(path_pool == (char *)new_def + sz);
 	key_def_set_func(new_def);
diff --git a/src/box/key_def.h b/src/box/key_def.h
index 6205c278a..fe4fd095c 100644
--- a/src/box/key_def.h
+++ b/src/box/key_def.h
@@ -214,6 +214,34 @@ struct key_def {
 	bool has_optional_parts;
 	/** Key fields mask. @sa column_mask.h for details. */
 	uint64_t column_mask;
+	/**
+	 * In case of the multikey index, a pointer to the
+	 * JSON path string, the path to the root node of
+	 * multikey index that contains the array having
+	 * index placeholder sign [*].
+	 *
+	 * This pointer duplicates the JSON path of some key_part.
+	 * This path is not 0-terminated. Moreover, it is only
+	 * JSON path subpath so key_def::multikey_path_len must
+	 * be directly used in all cases.
+	 *
+	 * This field is not NULL iff this is multikey index
+	 * key definition.
+	 */
+	const char *multikey_path;
+	/**
+	 * The length of the key_def::multikey_path.
+	 * Valid when key_def_is_multikey(key_def) is true,
+	 * undefined otherwise.
+	 */
+	uint32_t multikey_path_len;
+	/**
+	 * The index of the root field of the multikey JSON
+	 * path index key_def::multikey_path.
+	 * Valid when key_def_is_multikey(key_def) is true,
+	 * undefined otherwise.
+	*/
+	uint32_t multikey_fieldno;
 	/** The size of the 'parts' array. */
 	uint32_t part_count;
 	/** Description of parts of a multipart index. */
@@ -452,6 +480,12 @@ key_def_is_sequential(const struct key_def *key_def)
 	return true;
 }
 
+static inline bool
+key_def_is_multikey(const struct key_def *key_def)
+{
+	return key_def->multikey_path != NULL;
+}
+
 /**
  * Return true if @a key_def defines has fields that requires
  * special collation comparison.
diff --git a/src/box/memtx_engine.c b/src/box/memtx_engine.c
index 210f3c22c..65e8804a4 100644
--- a/src/box/memtx_engine.c
+++ b/src/box/memtx_engine.c
@@ -1330,5 +1330,7 @@ memtx_index_def_change_requires_rebuild(struct index *index,
 				  TUPLE_INDEX_BASE) != 0)
 			return true;
 	}
+	assert(key_def_is_multikey(old_cmp_def) ==
+	       key_def_is_multikey(new_cmp_def));
 	return false;
 }
diff --git a/src/box/memtx_space.c b/src/box/memtx_space.c
index a28204d30..c3c9ac79b 100644
--- a/src/box/memtx_space.c
+++ b/src/box/memtx_space.c
@@ -637,6 +637,12 @@ memtx_space_check_index_def(struct space *space, struct index_def *index_def)
 				 "HASH index must be unique");
 			return -1;
 		}
+		if (key_def_is_multikey(index_def->key_def)) {
+			diag_set(ClientError, ER_MODIFY_INDEX,
+				 index_def->name, space_name(space),
+				 "HASH index cannot be multikey");
+			return -1;
+		}
 		break;
 	case TREE:
 		/* TREE index has no limitations. */
@@ -660,6 +666,12 @@ memtx_space_check_index_def(struct space *space, struct index_def *index_def)
 				 "RTREE index field type must be ARRAY");
 			return -1;
 		}
+		if (key_def_is_multikey(index_def->key_def)) {
+			diag_set(ClientError, ER_MODIFY_INDEX,
+				 index_def->name, space_name(space),
+				 "RTREE index cannot be multikey");
+			return -1;
+		}
 		/* no furter checks of parts needed */
 		return 0;
 	case BITSET:
@@ -682,6 +694,12 @@ memtx_space_check_index_def(struct space *space, struct index_def *index_def)
 				 "BITSET index field type must be NUM or STR");
 			return -1;
 		}
+		if (key_def_is_multikey(index_def->key_def)) {
+			diag_set(ClientError, ER_MODIFY_INDEX,
+				 index_def->name, space_name(space),
+				 "BITSET index cannot be multikey");
+			return -1;
+		}
 		/* no furter checks of parts needed */
 		return 0;
 	default:
diff --git a/src/box/memtx_tree.c b/src/box/memtx_tree.c
index fe037c54a..a01aed481 100644
--- a/src/box/memtx_tree.c
+++ b/src/box/memtx_tree.c
@@ -584,6 +584,139 @@ memtx_tree_index_replace(struct index *base, struct tuple *old_tuple,
 	return 0;
 }
 
+/**
+ * Perform tuple insertion by given multikey index.
+ * In case of replacement, all old tuple entries are deleted
+ * by all it's multikey indexes.
+ */
+static int
+memtx_tree_index_replace_multikey_one(struct memtx_tree_index *index,
+			struct tuple *old_tuple, struct tuple *new_tuple,
+			enum dup_replace_mode mode, int multikey_idx,
+			struct tuple **replaced_tuple)
+{
+	struct memtx_tree_data new_data, dup_data;
+	new_data.tuple = new_tuple;
+	new_data.hint = multikey_idx;
+	dup_data.tuple = NULL;
+	if (memtx_tree_insert(&index->tree, new_data, &dup_data) != 0) {
+		diag_set(OutOfMemory, MEMTX_EXTENT_SIZE, "memtx_tree_index",
+			 "replace");
+		return -1;
+	}
+	int errcode = 0;
+	if (dup_data.tuple == new_tuple) {
+		/*
+		 * When tuple contains the same key multiple
+		 * times, the previous key occurrence is pushed
+		 * out of the index.
+		 */
+		dup_data.tuple = NULL;
+	} else if ((errcode = replace_check_dup(old_tuple, dup_data.tuple,
+					        mode)) != 0) {
+		/* Rollback replace. */
+		memtx_tree_delete(&index->tree, new_data);
+		if (dup_data.tuple != NULL)
+			memtx_tree_insert(&index->tree, dup_data, NULL);
+		struct space *sp = space_cache_find(index->base.def->space_id);
+		if (sp != NULL) {
+			diag_set(ClientError, errcode, index->base.def->name,
+				 space_name(sp));
+		}
+		return -1;
+	}
+	*replaced_tuple = dup_data.tuple;
+	return 0;
+}
+
+/**
+ * Rollback the sequence of memtx_tree_index_replace_multikey_one
+ * insertions with multikey indexes [0, err_multikey_idx - 1]
+ * where the err_multikey_idx is the first multikey index where
+ * error has been raised.
+ *
+ * This routine can't fail because all replaced_tuple (when
+ * specified) nodes in tree are already allocated (they might be
+ * overridden with new_tuple, but they definitely present) and
+ * delete operation is fault-tolerant.
+ */
+static void
+memtx_tree_index_replace_multikey_rollback(struct memtx_tree_index *index,
+			struct tuple *new_tuple, struct tuple *replaced_tuple,
+			int err_multikey_idx)
+{
+	struct memtx_tree_data data;
+	if (replaced_tuple != NULL) {
+		/* Restore replaced tuple index occurrences. */
+		struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
+		data.tuple = replaced_tuple;
+		uint32_t multikey_count =
+			tuple_multikey_count(replaced_tuple, cmp_def);
+		for (int i = 0; (uint32_t) i < multikey_count; i++) {
+			data.hint = i;
+			memtx_tree_insert(&index->tree, data, NULL);
+		}
+	}
+	/*
+	 * Rollback new_tuple insertion by multikey index
+	 * [0, multikey_idx).
+	 */
+	data.tuple = new_tuple;
+	for (int i = 0; i < err_multikey_idx; i++) {
+		data.hint = i;
+		memtx_tree_delete_identical(&index->tree, data);
+	}
+}
+
+static int
+memtx_tree_index_replace_multikey(struct index *base, struct tuple *old_tuple,
+			struct tuple *new_tuple, enum dup_replace_mode mode,
+			struct tuple **result)
+{
+	struct memtx_tree_index *index = (struct memtx_tree_index *)base;
+	struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
+	*result = NULL;
+	if (new_tuple != NULL) {
+		int multikey_idx = 0, err = 0;
+		uint32_t multikey_count =
+			tuple_multikey_count(new_tuple, cmp_def);
+		for (; (uint32_t) multikey_idx < multikey_count;
+		     multikey_idx++) {
+			struct tuple *replaced_tuple;
+			err = memtx_tree_index_replace_multikey_one(index,
+						old_tuple, new_tuple, mode,
+						multikey_idx, &replaced_tuple);
+			if (err != 0)
+				break;
+			if (replaced_tuple != NULL) {
+				assert(*result == NULL ||
+				       *result == replaced_tuple);
+				*result = replaced_tuple;
+			}
+		}
+		if (err != 0) {
+			memtx_tree_index_replace_multikey_rollback(index,
+					new_tuple, *result, multikey_idx);
+			return -1;
+		}
+		if (*result != NULL) {
+			assert(old_tuple == NULL || old_tuple == *result);
+			old_tuple = *result;
+		}
+	}
+	if (old_tuple != NULL) {
+		struct memtx_tree_data data;
+		data.tuple = old_tuple;
+		uint32_t multikey_count =
+			tuple_multikey_count(old_tuple, cmp_def);
+		for (int i = 0; (uint32_t) i < multikey_count; i++) {
+			data.hint = i;
+			memtx_tree_delete_identical(&index->tree, data);
+		}
+	}
+	return 0;
+}
+
 static struct iterator *
 memtx_tree_index_create_iterator(struct index *base, enum iterator_type type,
 				 const char *key, uint32_t part_count)
@@ -655,11 +788,11 @@ memtx_tree_index_reserve(struct index *base, uint32_t size_hint)
 	return 0;
 }
 
+/** Initialize the next element of the index build_array. */
 static int
-memtx_tree_index_build_next(struct index *base, struct tuple *tuple)
+memtx_tree_index_build_array_append(struct memtx_tree_index *index,
+				    struct tuple *tuple, hint_t hint)
 {
-	struct memtx_tree_index *index = (struct memtx_tree_index *)base;
-	struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
 	if (index->build_array == NULL) {
 		index->build_array = malloc(MEMTX_EXTENT_SIZE);
 		if (index->build_array == NULL) {
@@ -673,7 +806,7 @@ memtx_tree_index_build_next(struct index *base, struct tuple *tuple)
 	assert(index->build_array_size <= index->build_array_alloc_size);
 	if (index->build_array_size == index->build_array_alloc_size) {
 		index->build_array_alloc_size = index->build_array_alloc_size +
-					index->build_array_alloc_size / 2;
+				DIV_ROUND_UP(index->build_array_alloc_size, 2);
 		struct memtx_tree_data *tmp =
 			realloc(index->build_array,
 				index->build_array_alloc_size * sizeof(*tmp));
@@ -687,10 +820,62 @@ memtx_tree_index_build_next(struct index *base, struct tuple *tuple)
 	struct memtx_tree_data *elem =
 		&index->build_array[index->build_array_size++];
 	elem->tuple = tuple;
-	elem->hint = tuple_hint(tuple, cmp_def);
+	elem->hint = hint;
 	return 0;
 }
 
+static int
+memtx_tree_index_build_next(struct index *base, struct tuple *tuple)
+{
+	struct memtx_tree_index *index = (struct memtx_tree_index *)base;
+	struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
+	return memtx_tree_index_build_array_append(index, tuple,
+						   tuple_hint(tuple, cmp_def));
+}
+
+static int
+memtx_tree_index_build_next_multikey(struct index *base, struct tuple *tuple)
+{
+	struct memtx_tree_index *index = (struct memtx_tree_index *)base;
+	struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
+	uint32_t multikey_count = tuple_multikey_count(tuple, cmp_def);
+	for (uint32_t multikey_idx = 0; multikey_idx < multikey_count;
+	     multikey_idx++) {
+		if (memtx_tree_index_build_array_append(index, tuple,
+							multikey_idx) != 0)
+			return -1;
+	}
+	return 0;
+}
+
+/**
+ * Process build_array of specified index and remove duplicates
+ * of equal tuples (in terms of index's cmp_def and have same
+ * tuple pointer). The build_array is expected to be sorted.
+ */
+static void
+memtx_tree_index_build_array_deduplicate(struct memtx_tree_index *index)
+{
+	struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
+	size_t w_idx = 0, r_idx = 1;
+	while (r_idx < index->build_array_size) {
+		if (index->build_array[w_idx].tuple !=
+		    index->build_array[r_idx].tuple ||
+		    tuple_compare_hinted(index->build_array[w_idx].tuple,
+					index->build_array[w_idx].hint,
+					index->build_array[r_idx].tuple,
+					index->build_array[r_idx].hint,
+					cmp_def) != 0) {
+			/* Do not override the element itself. */
+			if (++w_idx == r_idx)
+				continue;
+			index->build_array[w_idx] = index->build_array[r_idx];
+		}
+		r_idx++;
+	}
+	index->build_array_size = w_idx + 1;
+}
+
 static void
 memtx_tree_index_end_build(struct index *base)
 {
@@ -698,6 +883,16 @@ memtx_tree_index_end_build(struct index *base)
 	struct key_def *cmp_def = memtx_tree_cmp_def(&index->tree);
 	qsort_arg(index->build_array, index->build_array_size,
 		  sizeof(index->build_array[0]), memtx_tree_qcompare, cmp_def);
+	if (key_def_is_multikey(cmp_def)) {
+		/*
+		 * Multikey index may have equal(in terms of
+		 * cmp_def) keys inserted by different multikey
+		 * offsets. We must deduplicate them because
+		 * the following memtx_tree_build assumes that
+		 * all keys are unique.
+		 */
+		memtx_tree_index_build_array_deduplicate(index);
+	}
 	memtx_tree_build(&index->tree, index->build_array,
 			 index->build_array_size);
 
@@ -793,6 +988,36 @@ static const struct index_vtab memtx_tree_index_vtab = {
 	/* .end_build = */ memtx_tree_index_end_build,
 };
 
+static const struct index_vtab memtx_tree_index_multikey_vtab = {
+	/* .destroy = */ memtx_tree_index_destroy,
+	/* .commit_create = */ generic_index_commit_create,
+	/* .abort_create = */ generic_index_abort_create,
+	/* .commit_modify = */ generic_index_commit_modify,
+	/* .commit_drop = */ generic_index_commit_drop,
+	/* .update_def = */ memtx_tree_index_update_def,
+	/* .depends_on_pk = */ memtx_tree_index_depends_on_pk,
+	/* .def_change_requires_rebuild = */
+		memtx_index_def_change_requires_rebuild,
+	/* .size = */ memtx_tree_index_size,
+	/* .bsize = */ memtx_tree_index_bsize,
+	/* .min = */ generic_index_min,
+	/* .max = */ generic_index_max,
+	/* .random = */ memtx_tree_index_random,
+	/* .count = */ memtx_tree_index_count,
+	/* .get = */ memtx_tree_index_get,
+	/* .replace = */ memtx_tree_index_replace_multikey,
+	/* .create_iterator = */ memtx_tree_index_create_iterator,
+	/* .create_snapshot_iterator = */
+		memtx_tree_index_create_snapshot_iterator,
+	/* .stat = */ generic_index_stat,
+	/* .compact = */ generic_index_compact,
+	/* .reset_stat = */ generic_index_reset_stat,
+	/* .begin_build = */ memtx_tree_index_begin_build,
+	/* .reserve = */ memtx_tree_index_reserve,
+	/* .build_next = */ memtx_tree_index_build_next_multikey,
+	/* .end_build = */ memtx_tree_index_end_build,
+};
+
 struct index *
 memtx_tree_index_new(struct memtx_engine *memtx, struct index_def *def)
 {
@@ -803,8 +1028,11 @@ memtx_tree_index_new(struct memtx_engine *memtx, struct index_def *def)
 			 "malloc", "struct memtx_tree_index");
 		return NULL;
 	}
+	const struct index_vtab *vtab = key_def_is_multikey(def->key_def) ?
+					&memtx_tree_index_multikey_vtab :
+					&memtx_tree_index_vtab;
 	if (index_create(&index->base, (struct engine *)memtx,
-			 &memtx_tree_index_vtab, def) != 0) {
+			 vtab, def) != 0) {
 		free(index);
 		return NULL;
 	}
diff --git a/src/box/sql.c b/src/box/sql.c
index 2310ee5e3..7a20d86e0 100644
--- a/src/box/sql.c
+++ b/src/box/sql.c
@@ -782,7 +782,8 @@ tarantoolsqlIdxKeyCompare(struct BtCursor *cursor,
 			} else {
 				uint32_t field_offset =
 					field_map_get_offset(field_map,
-							     field->offset_slot);
+							     field->offset_slot,
+							     -1);
 				p = base + field_offset;
 			}
 		}
diff --git a/src/box/tuple.c b/src/box/tuple.c
index c325f58c9..35194001f 100644
--- a/src/box/tuple.c
+++ b/src/box/tuple.c
@@ -453,7 +453,8 @@ tuple_field_go_to_key(const char **field, const char *key, int len)
 }
 
 int
-tuple_go_to_path(const char **data, const char *path, uint32_t path_len)
+tuple_go_to_path(const char **data, const char *path, uint32_t path_len,
+		 int multikey_idx)
 {
 	int rc;
 	struct json_lexer lexer;
@@ -461,6 +462,11 @@ tuple_go_to_path(const char **data, const char *path, uint32_t path_len)
 	json_lexer_create(&lexer, path, path_len, TUPLE_INDEX_BASE);
 	while ((rc = json_lexer_next_token(&lexer, &token)) == 0) {
 		switch (token.type) {
+		case JSON_TOKEN_ANY:
+			if (multikey_idx < 0)
+				return -1;
+			token.num = multikey_idx;
+			FALLTHROUGH;
 		case JSON_TOKEN_NUM:
 			rc = tuple_field_go_to_index(data, token.num);
 			break;
@@ -530,7 +536,24 @@ tuple_field_raw_by_full_path(struct tuple_format *format, const char *tuple,
 	}
 	return tuple_field_raw_by_path(format, tuple, field_map, fieldno,
 				       path + lexer.offset,
-				       path_len - lexer.offset, NULL);
+				       path_len - lexer.offset, NULL, -1);
+}
+
+uint32_t
+tuple_raw_multikey_count(struct tuple_format *format, const char *data,
+			       const uint32_t *field_map,
+			       struct key_def *key_def)
+{
+	assert(key_def_is_multikey(key_def));
+	const char *array_raw =
+		tuple_field_raw_by_path(format, data, field_map,
+					key_def->multikey_fieldno,
+					key_def->multikey_path,
+					key_def->multikey_path_len, NULL, -1);
+	if (array_raw == NULL)
+		return 0;
+	assert(mp_typeof(*array_raw) == MP_ARRAY);
+	return mp_decode_array(&array_raw);
 }
 
 /* }}} tuple_field_* getters */
diff --git a/src/box/tuple.h b/src/box/tuple.h
index d261d4cc9..c0d06dbe5 100644
--- a/src/box/tuple.h
+++ b/src/box/tuple.h
@@ -506,14 +506,19 @@ tuple_field_count(struct tuple *tuple)
  *                      with NULL.
  * @param path The path to process.
  * @param path_len The length of the @path.
+ * @param multikey_idx The multikey index hint - index of
+ *                     multikey index key to retrieve when array
+ *                     index placeholder "[*]" is met.
  * @retval 0 On success.
  * @retval -1 In case of error in JSON path.
  */
 int
-tuple_go_to_path(const char **data, const char *path, uint32_t path_len);
+tuple_go_to_path(const char **data, const char *path, uint32_t path_len,
+		 int multikey_idx);
 
 /**
- * Get tuple field by field index and relative JSON path.
+ * Get tuple field by field index, relative JSON path and
+ * multikey_idx.
  * @param format Tuple format.
  * @param tuple MessagePack tuple's body.
  * @param field_map Tuple field map.
@@ -526,12 +531,15 @@ tuple_go_to_path(const char **data, const char *path, uint32_t path_len);
  *                         access data in a single operation.
  *                         Else it is initialized with offset_slot
  *                         of format field by path.
+ * @param multikey_idx The multikey index hint - index of
+ *                     multikey item item to retrieve when array
+ *                     index placeholder "[*]" is met.
  */
 static inline const char *
 tuple_field_raw_by_path(struct tuple_format *format, const char *tuple,
 			const uint32_t *field_map, uint32_t fieldno,
 			const char *path, uint32_t path_len,
-			int32_t *offset_slot_hint)
+			int32_t *offset_slot_hint, int multikey_idx)
 {
 	int32_t offset_slot;
 	if (offset_slot_hint != NULL &&
@@ -558,7 +566,8 @@ tuple_field_raw_by_path(struct tuple_format *format, const char *tuple,
 			*offset_slot_hint = offset_slot;
 offset_slot_access:
 		/* Indexed field */
-		offset = field_map_get_offset(field_map, offset_slot);
+		offset = field_map_get_offset(field_map, offset_slot,
+					      multikey_idx);
 		if (offset == 0)
 			return NULL;
 		tuple += offset;
@@ -572,8 +581,8 @@ parse:
 		for (uint32_t k = 0; k < fieldno; k++)
 			mp_next(&tuple);
 		if (path != NULL &&
-		    unlikely(tuple_go_to_path(&tuple, path,
-						    path_len) != 0))
+		    unlikely(tuple_go_to_path(&tuple, path, path_len,
+					      multikey_idx) != 0))
 			return NULL;
 	}
 	return tuple;
@@ -595,7 +604,7 @@ tuple_field_raw(struct tuple_format *format, const char *tuple,
 		const uint32_t *field_map, uint32_t field_no)
 {
 	return tuple_field_raw_by_path(format, tuple, field_map, field_no,
-				       NULL, 0, NULL);
+				       NULL, 0, NULL, -1);
 }
 
 /**
@@ -634,16 +643,19 @@ tuple_field_raw_by_full_path(struct tuple_format *format, const char *tuple,
 			     uint32_t path_len, uint32_t path_hash);
 
 /**
- * Get a tuple field pointed to by an index part.
+ * Get a tuple field pointed to by an index part and multikey
+ * index hint.
  * @param format Tuple format.
- * @param tuple A pointer to MessagePack array.
+ * @param data A pointer to MessagePack array.
  * @param field_map A pointer to the LAST element of field map.
  * @param part Index part to use.
+ * @param multikey_idx A multikey index hint.
  * @retval Field data if the field exists or NULL.
  */
 static inline const char *
-tuple_field_raw_by_part(struct tuple_format *format, const char *data,
-			const uint32_t *field_map, struct key_part *part)
+tuple_field_raw_by_part_multikey(struct tuple_format *format, const char *data,
+				 const uint32_t *field_map,
+				 struct key_part *part, int multikey_idx)
 {
 	if (unlikely(part->format_epoch != format->epoch)) {
 		assert(format->epoch != 0);
@@ -656,7 +668,23 @@ tuple_field_raw_by_part(struct tuple_format *format, const char *data,
 	}
 	return tuple_field_raw_by_path(format, data, field_map, part->fieldno,
 				       part->path, part->path_len,
-				       &part->offset_slot_cache);
+				       &part->offset_slot_cache, multikey_idx);
+}
+
+/**
+ * Get a tuple field pointed to by an index part.
+ * @param format Tuple format.
+ * @param data A pointer to MessagePack array.
+ * @param field_map A pointer to the LAST element of field map.
+ * @param part Index part to use.
+ * @retval Field data if the field exists or NULL.
+ */
+static inline const char *
+tuple_field_raw_by_part(struct tuple_format *format, const char *data,
+			const uint32_t *field_map, struct key_part *part)
+{
+	return tuple_field_raw_by_part_multikey(format, data, field_map,
+						part, -1);
 }
 
 /**
@@ -672,6 +700,33 @@ tuple_field_by_part(struct tuple *tuple, struct key_part *part)
 				       tuple_field_map(tuple), part);
 }
 
+/**
+ * Get count of multikey index keys in tuple by given multikey
+ * index definition.
+ * @param format Tuple format.
+ * @param data A pointer to MessagePack array.
+ * @param field_map A pointer to the LAST element of field map.
+ * @param key_def Index key_definition.
+ * @retval Count of multikey index keys in the given tuple.
+ */
+uint32_t
+tuple_raw_multikey_count(struct tuple_format *format, const char *data,
+			 const uint32_t *field_map, struct key_def *key_def);
+
+/**
+ * Get count of multikey index keys in tuple by given multikey
+ * index definition.
+ * @param tuple Tuple to get the count of multikey keys from.
+ * @param key_def Index key_definition.
+ * @retval Count of multikey index keys in the given tuple.
+ */
+static inline uint32_t
+tuple_multikey_count(struct tuple *tuple, struct key_def *key_def)
+{
+	return tuple_raw_multikey_count(tuple_format(tuple), tuple_data(tuple),
+					tuple_field_map(tuple), key_def);
+}
+
 /**
  * @brief Tuple Interator
  */
diff --git a/src/box/tuple_compare.cc b/src/box/tuple_compare.cc
index a3cabf19f..af9aa7b6c 100644
--- a/src/box/tuple_compare.cc
+++ b/src/box/tuple_compare.cc
@@ -375,6 +375,29 @@ mp_compare_scalar_coll(const char *field_a, const char *field_b,
 	return mp_compare_scalar_with_type(field_a, type_a, field_b, type_b);
 }
 
+static inline int
+tuple_compare_multikey(struct tuple *tuple_a, struct tuple *tuple_b,
+		       struct key_def *key_def)
+{
+	(void)tuple_a;
+	(void)tuple_b;
+	(void)key_def;
+	unreachable();
+	return 0;
+}
+
+static inline int
+tuple_compare_with_key_multikey(struct tuple *tuple, const char *key,
+				uint32_t part_count, struct key_def *key_def)
+{
+	(void) tuple;
+	(void) key;
+	(void) part_count;
+	(void) key_def;
+	unreachable();
+	return 0;
+}
+
 /**
  * @brief Compare two fields parts using a type definition
  * @param field_a field
@@ -445,7 +468,8 @@ tuple_compare_field_with_type(const char *field_a, enum mp_type a_type,
 	}
 }
 
-template<bool is_nullable, bool has_optional_parts, bool has_json_paths>
+template<bool is_nullable, bool has_optional_parts, bool has_json_paths,
+	 bool is_multikey>
 static inline int
 tuple_compare_slowpath_hinted(struct tuple *tuple_a, hint_t tuple_a_hint,
 			      struct tuple *tuple_b, hint_t tuple_b_hint,
@@ -455,8 +479,11 @@ tuple_compare_slowpath_hinted(struct tuple *tuple_a, hint_t tuple_a_hint,
 	assert(!has_optional_parts || is_nullable);
 	assert(is_nullable == key_def->is_nullable);
 	assert(has_optional_parts == key_def->has_optional_parts);
-	int rc = hint_cmp(tuple_a_hint, tuple_b_hint);
-	if (rc != 0)
+	assert(key_def_is_multikey(key_def) == is_multikey);
+	assert(!is_multikey || (is_multikey == has_json_paths &&
+		tuple_a_hint != HINT_NONE && tuple_b_hint != HINT_NONE));
+	int rc = 0;
+	if (!is_multikey && (rc = hint_cmp(tuple_a_hint, tuple_b_hint)) != 0)
 		return rc;
 	struct key_part *part = key_def->parts;
 	const char *tuple_a_raw = tuple_data(tuple_a);
@@ -499,7 +526,14 @@ tuple_compare_slowpath_hinted(struct tuple *tuple_a, hint_t tuple_a_hint,
 		end = part + key_def->part_count;
 
 	for (; part < end; part++) {
-		if (has_json_paths) {
+		if (is_multikey) {
+			field_a = tuple_field_raw_by_part_multikey(format_a,
+					tuple_a_raw, field_map_a, part,
+					(int)tuple_a_hint);
+			field_b = tuple_field_raw_by_part_multikey(format_b,
+					tuple_b_raw, field_map_b, part,
+					(int)tuple_b_hint);
+		} else if (has_json_paths) {
 			field_a = tuple_field_raw_by_part(format_a, tuple_a_raw,
 							  field_map_a, part);
 			field_b = tuple_field_raw_by_part(format_b, tuple_b_raw,
@@ -556,7 +590,14 @@ tuple_compare_slowpath_hinted(struct tuple *tuple_a, hint_t tuple_a_hint,
 	 */
 	end = key_def->parts + key_def->part_count;
 	for (; part < end; ++part) {
-		if (has_json_paths) {
+		if (is_multikey) {
+			field_a = tuple_field_raw_by_part_multikey(format_a,
+					tuple_a_raw, field_map_a, part,
+					(int)tuple_a_hint);
+			field_b = tuple_field_raw_by_part_multikey(format_b,
+					tuple_b_raw, field_map_b, part,
+					(int)tuple_b_hint);
+		} else if (has_json_paths) {
 			field_a = tuple_field_raw_by_part(format_a, tuple_a_raw,
 							  field_map_a, part);
 			field_b = tuple_field_raw_by_part(format_b, tuple_b_raw,
@@ -586,11 +627,12 @@ tuple_compare_slowpath(struct tuple *tuple_a, struct tuple *tuple_b,
 		       struct key_def *key_def)
 {
 	return tuple_compare_slowpath_hinted
-		<is_nullable, has_optional_parts, has_json_paths>
+		<is_nullable, has_optional_parts, has_json_paths, false>
 		(tuple_a, HINT_NONE, tuple_b, HINT_NONE, key_def);
 }
 
-template<bool is_nullable, bool has_optional_parts, bool has_json_paths>
+template<bool is_nullable, bool has_optional_parts, bool has_json_paths,
+	 bool is_multikey>
 static inline int
 tuple_compare_with_key_slowpath_hinted(struct tuple *tuple,
 		hint_t tuple_hint, const char *key, uint32_t part_count,
@@ -602,8 +644,11 @@ tuple_compare_with_key_slowpath_hinted(struct tuple *tuple,
 	assert(has_optional_parts == key_def->has_optional_parts);
 	assert(key != NULL || part_count == 0);
 	assert(part_count <= key_def->part_count);
-	int rc = hint_cmp(tuple_hint, key_hint);
-	if (rc != 0)
+	assert(key_def_is_multikey(key_def) == is_multikey);
+	assert(!is_multikey || (is_multikey == has_json_paths &&
+		tuple_hint != HINT_NONE && key_hint == HINT_NONE));
+	int rc = 0;
+	if (!is_multikey && (rc = hint_cmp(tuple_hint, key_hint)) != 0)
 		return rc;
 	struct key_part *part = key_def->parts;
 	struct tuple_format *format = tuple_format(tuple);
@@ -612,7 +657,11 @@ tuple_compare_with_key_slowpath_hinted(struct tuple *tuple,
 	enum mp_type a_type, b_type;
 	if (likely(part_count == 1)) {
 		const char *field;
-		if (has_json_paths) {
+		if (is_multikey) {
+			field = tuple_field_raw_by_part_multikey(format,
+					tuple_raw, field_map, part,
+					(int)tuple_hint);
+		} else if (has_json_paths) {
 			field = tuple_field_raw_by_part(format, tuple_raw,
 							field_map, part);
 		} else {
@@ -642,7 +691,11 @@ tuple_compare_with_key_slowpath_hinted(struct tuple *tuple,
 	struct key_part *end = part + part_count;
 	for (; part < end; ++part, mp_next(&key)) {
 		const char *field;
-		if (has_json_paths) {
+		if (is_multikey) {
+			field = tuple_field_raw_by_part_multikey(format,
+					tuple_raw, field_map, part,
+					(int)tuple_hint);
+		} else if (has_json_paths) {
 			field = tuple_field_raw_by_part(format, tuple_raw,
 							field_map, part);
 		} else {
@@ -684,7 +737,7 @@ tuple_compare_with_key_slowpath(struct tuple *tuple, const char *key,
 				uint32_t part_count, struct key_def *key_def)
 {
 	return tuple_compare_with_key_slowpath_hinted
-		<is_nullable, has_optional_parts, has_json_paths>
+		<is_nullable, has_optional_parts, has_json_paths, false>
 		(tuple, HINT_NONE, key, part_count, HINT_NONE, key_def);
 }
 
@@ -1367,6 +1420,9 @@ static const comparator_with_key_signature cmp_wk_arr[] = {
  *
  *  - For a field containing NULL, the value is 0, and we rely on
  *    mp_class comparison rules for arranging nullable fields.
+ *
+ * Note: comparison hint only makes sense for non-multikey
+ * indexes.
  */
 #define HINT_BITS		(sizeof(hint_t) * CHAR_BIT)
 #define HINT_CLASS_BITS		4
@@ -1615,6 +1671,35 @@ tuple_hint(struct tuple *tuple, struct key_def *key_def)
 	return field_hint<type, is_nullable>(field, key_def->parts->coll);
 }
 
+static hint_t
+key_hint_multikey(const char *key, uint32_t part_count, struct key_def *key_def)
+{
+	(void) key;
+	(void) part_count;
+	(void) key_def;
+	/*
+	 * Multikey hint for tuple is an index of the key in
+	 * array, it always must be defined. While
+	 * tuple_hint_multikey, tuple_compare_multikey and
+	 * tuple_compare_with_key_multikey assume that it must
+	 * be initialized manually(so they mustn't be called),
+	 * the virtual method for a key makes sense. Overriding
+	 * this method such way, we extend existend code to
+	 * do nothing on key hint calculation an it is valid
+	 * because it is never used(unlike tuple hint).
+	 */
+	return HINT_NONE;
+}
+
+static hint_t
+tuple_hint_multikey(struct tuple *tuple, struct key_def *key_def)
+{
+	(void) tuple;
+	(void) key_def;
+	unreachable();
+	return HINT_NONE;
+}
+
 template<enum field_type type, bool is_nullable>
 static void
 key_def_set_hint_func(struct key_def *def)
@@ -1636,6 +1721,11 @@ key_def_set_hint_func(struct key_def *def)
 static void
 key_def_set_hint_func(struct key_def *def)
 {
+	if (key_def_is_multikey(def)) {
+		def->key_hint = key_hint_multikey;
+		def->tuple_hint = tuple_hint_multikey;
+		return;
+	}
 	switch (def->parts->type) {
 	case FIELD_TYPE_BOOLEAN:
 		key_def_set_hint_func<FIELD_TYPE_BOOLEAN>(def);
@@ -1714,7 +1804,7 @@ key_def_set_compare_func_fast(struct key_def *def)
 			tuple_compare_slowpath<false, false, false>;
 		cmp_hinted = is_sequential ?
 			tuple_compare_sequential_hinted<false, false> :
-			tuple_compare_slowpath_hinted<false, false, false>;
+			tuple_compare_slowpath_hinted<false, false, false, false>;
 	}
 	if (cmp_wk == NULL) {
 		cmp_wk = is_sequential ?
@@ -1722,7 +1812,8 @@ key_def_set_compare_func_fast(struct key_def *def)
 			tuple_compare_with_key_slowpath<false, false, false>;
 		cmp_wk_hinted = is_sequential ?
 			tuple_compare_with_key_sequential_hinted<false, false> :
-			tuple_compare_with_key_slowpath_hinted<false, false, false>;
+			tuple_compare_with_key_slowpath_hinted<false, false,
+							       false, false>;
 	}
 
 	def->tuple_compare = cmp;
@@ -1750,12 +1841,13 @@ key_def_set_compare_func_plain(struct key_def *def)
 		def->tuple_compare = tuple_compare_slowpath
 				<is_nullable, has_optional_parts, false>;
 		def->tuple_compare_hinted = tuple_compare_slowpath_hinted
-				<is_nullable, has_optional_parts, false>;
+				<is_nullable, has_optional_parts, false, false>;
 		def->tuple_compare_with_key = tuple_compare_with_key_slowpath
 				<is_nullable, has_optional_parts, false>;
 		def->tuple_compare_with_key_hinted =
 					tuple_compare_with_key_slowpath_hinted
-					<is_nullable, has_optional_parts, false>;
+					<is_nullable, has_optional_parts,
+					 false, false>;
 	}
 }
 
@@ -1764,15 +1856,25 @@ static void
 key_def_set_compare_func_json(struct key_def *def)
 {
 	assert(def->has_json_paths);
-	def->tuple_compare = tuple_compare_slowpath
-			<is_nullable, has_optional_parts, true>;
-	def->tuple_compare_hinted = tuple_compare_slowpath_hinted
-			<is_nullable, has_optional_parts, true>;
-	def->tuple_compare_with_key = tuple_compare_with_key_slowpath
-			<is_nullable, has_optional_parts, true>;
-	def->tuple_compare_with_key_hinted =
-			tuple_compare_with_key_slowpath_hinted
-			<is_nullable, has_optional_parts, true>;
+	if (key_def_is_multikey(def)) {
+		def->tuple_compare = tuple_compare_multikey;
+		def->tuple_compare_hinted = tuple_compare_slowpath_hinted
+				<is_nullable, has_optional_parts, true, true>;
+		def->tuple_compare_with_key = tuple_compare_with_key_multikey;
+		def->tuple_compare_with_key_hinted =
+				tuple_compare_with_key_slowpath_hinted
+				<is_nullable, has_optional_parts, true, true>;
+	} else {
+		def->tuple_compare = tuple_compare_slowpath
+				<is_nullable, has_optional_parts, true>;
+		def->tuple_compare_hinted = tuple_compare_slowpath_hinted
+				<is_nullable, has_optional_parts, true, false>;
+		def->tuple_compare_with_key = tuple_compare_with_key_slowpath
+				<is_nullable, has_optional_parts, true>;
+		def->tuple_compare_with_key_hinted =
+				tuple_compare_with_key_slowpath_hinted
+				<is_nullable, has_optional_parts, true, false>;
+	}
 }
 
 void
diff --git a/src/box/tuple_compare.h b/src/box/tuple_compare.h
index 77140ca0c..8614f2320 100644
--- a/src/box/tuple_compare.h
+++ b/src/box/tuple_compare.h
@@ -39,6 +39,16 @@ extern "C" {
 struct key_def;
 
 /**
+ * Hints are now used for two purposes - passing the index of the
+ * key used in the case of multikey index and to speed up the
+ * comparators.
+ *
+ * Scenario I. Pass the multikey index of the key to comparator.
+ * In the case of multikey index arises an ambiguity: which key
+ * should be used in the comparison. Hints act as an non-negative
+ * numeric index of key to use.
+ *
+ * Scenario II. Speed up comparators.
  * Tuple comparison hint h(t) is such a function of tuple t that
  * the following conditions always hold for any pair of tuples
  * t1 and t2:
diff --git a/src/box/tuple_extract_key.cc b/src/box/tuple_extract_key.cc
index 3c49094b8..07f114946 100644
--- a/src/box/tuple_extract_key.cc
+++ b/src/box/tuple_extract_key.cc
@@ -115,6 +115,7 @@ tuple_extract_key_slowpath(struct tuple *tuple, struct key_def *key_def,
 	assert(has_optional_parts == key_def->has_optional_parts);
 	assert(contains_sequential_parts ==
 	       key_def_contains_sequential_parts(key_def));
+	assert(!key_def_is_multikey(key_def));
 	assert(mp_sizeof_nil() == 1);
 	const char *data = tuple_data(tuple);
 	uint32_t part_count = key_def->part_count;
@@ -234,6 +235,7 @@ tuple_extract_key_slowpath_raw(const char *data, const char *data_end,
 	assert(has_json_paths == key_def->has_json_paths);
 	assert(!has_optional_parts || key_def->is_nullable);
 	assert(has_optional_parts == key_def->has_optional_parts);
+	assert(!key_def_is_multikey(key_def));
 	assert(mp_sizeof_nil() == 1);
 	/* allocate buffer with maximal possible size */
 	char *key = (char *) region_alloc(&fiber()->gc, data_end - data);
@@ -310,7 +312,7 @@ tuple_extract_key_slowpath_raw(const char *data, const char *data_end,
 		const char *src_end = field_end;
 		if (has_json_paths && part->path != NULL) {
 			if (tuple_go_to_path(&src, part->path,
-						   part->path_len) != 0) {
+					     part->path_len, -1) != 0) {
 				/*
 				 * The path must be correct as
 				 * it has already been validated
@@ -349,6 +351,7 @@ static void
 key_def_set_extract_func_plain(struct key_def *def)
 {
 	assert(!def->has_json_paths);
+	assert(!key_def_is_multikey(def));
 	if (key_def_is_sequential(def)) {
 		assert(contains_sequential_parts || def->part_count == 1);
 		def->tuple_extract_key = tuple_extract_key_sequential
diff --git a/src/box/tuple_format.c b/src/box/tuple_format.c
index 95eb9c826..7b782b19f 100644
--- a/src/box/tuple_format.c
+++ b/src/box/tuple_format.c
@@ -152,12 +152,14 @@ tuple_field_new(void)
 	field->offset_slot = TUPLE_OFFSET_SLOT_NIL;
 	field->coll_id = COLL_NONE;
 	field->nullable_action = ON_CONFLICT_ACTION_NONE;
+	field->multikey_required_fields = NULL;
 	return field;
 }
 
 static void
 tuple_field_delete(struct tuple_field *field)
 {
+	free(field->multikey_required_fields);
 	free(field);
 }
 
@@ -194,6 +196,51 @@ tuple_format_field_by_id(struct tuple_format *format, uint32_t id)
 	return NULL;
 }
 
+/**
+ * Check if child_field may be attached to parent_field,
+ * update the parent_field container type if required.
+ */
+static int
+tuple_field_ensure_child_compatibility(struct tuple_field *parent,
+				       struct tuple_field *child)
+{
+	enum field_type expected_type =
+		child->token.type == JSON_TOKEN_STR ?
+		FIELD_TYPE_MAP : FIELD_TYPE_ARRAY;
+	if (field_type1_contains_type2(parent->type, expected_type)) {
+		parent->type = expected_type;
+	} else {
+		diag_set(ClientError, ER_INDEX_PART_TYPE_MISMATCH,
+			 tuple_field_path(parent),
+			 field_type_strs[parent->type],
+			 field_type_strs[expected_type]);
+		return -1;
+	}
+	/*
+	 * Attempt to append JSON_TOKEN_ANY leaf to parent that
+	 * has other child records already i.e. is a intermediate
+	 * field of non-multikey JSON index.
+	 */
+	if (child->token.type == JSON_TOKEN_ANY &&
+	    !json_token_is_multikey(&parent->token) &&
+	    !json_token_is_leaf(&parent->token)) {
+		diag_set(ClientError, ER_MULTIKEY_INDEX_MISMATCH,
+			 tuple_field_path(parent));
+		return -1;
+	}
+	/*
+	 * Attempt to append not JSON_TOKEN_ANY child record to
+	 * the parent defined as multikey index root.
+	 */
+	if (json_token_is_multikey(&parent->token) &&
+	    child->token.type != JSON_TOKEN_ANY) {
+		diag_set(ClientError, ER_MULTIKEY_INDEX_MISMATCH,
+			 tuple_field_path(parent));
+		return -1;
+	}
+	return 0;
+}
+
 /**
  * Given a field number and a path, add the corresponding field
  * to the tuple format, allocating intermediate fields if
@@ -215,7 +262,7 @@ tuple_format_add_field(struct tuple_format *format, uint32_t fieldno,
 		goto end;
 	field = tuple_field_new();
 	if (field == NULL)
-		goto fail;
+		return NULL;
 
 	/*
 	 * Retrieve path_len memory chunk from the path_pool and
@@ -229,28 +276,14 @@ tuple_format_add_field(struct tuple_format *format, uint32_t fieldno,
 
 	int rc = 0;
 	uint32_t token_count = 0;
+	bool is_multikey = false;
 	struct json_tree *tree = &format->fields;
 	struct json_lexer lexer;
 	json_lexer_create(&lexer, path, path_len, TUPLE_INDEX_BASE);
 	while ((rc = json_lexer_next_token(&lexer, &field->token)) == 0 &&
 	       field->token.type != JSON_TOKEN_END) {
-		if (field->token.type == JSON_TOKEN_ANY) {
-			diag_set(ClientError, ER_UNSUPPORTED,
-				"Tarantool", "multikey indexes");
-			goto fail;
-		}
-		enum field_type expected_type =
-			field->token.type == JSON_TOKEN_STR ?
-			FIELD_TYPE_MAP : FIELD_TYPE_ARRAY;
-		if (field_type1_contains_type2(parent->type, expected_type)) {
-			parent->type = expected_type;
-		} else {
-			diag_set(ClientError, ER_INDEX_PART_TYPE_MISMATCH,
-				 tuple_field_path(parent),
-				 field_type_strs[parent->type],
-				 field_type_strs[expected_type]);
+		if (tuple_field_ensure_child_compatibility(parent, field) != 0)
 			goto fail;
-		}
 		struct tuple_field *next =
 			json_tree_lookup_entry(tree, &parent->token,
 					       &field->token,
@@ -268,7 +301,23 @@ tuple_format_add_field(struct tuple_format *format, uint32_t fieldno,
 			if (field == NULL)
 				goto fail;
 		}
+		if (json_token_is_multikey(&parent->token)) {
+			is_multikey = true;
+			if (parent->offset_slot == TUPLE_OFFSET_SLOT_NIL) {
+				/**
+				 * Allocate offset slot for array
+				 * is used in multikey index. This
+				 * is required to quickly extract
+				 * its size.
+				 * @see tuple_multikey_count()
+				 */
+				assert(parent->type == FIELD_TYPE_ARRAY);
+				*current_slot = *current_slot - 1;
+				parent->offset_slot = *current_slot;
+			}
+		}
 		parent->is_key_part = true;
+		next->is_multikey_part = is_multikey;
 		parent = next;
 		token_count++;
 	}
@@ -280,7 +329,6 @@ tuple_format_add_field(struct tuple_format *format, uint32_t fieldno,
 	assert(parent != NULL);
 	/* Update tree depth information. */
 	format->fields_depth = MAX(format->fields_depth, token_count + 1);
-cleanup:
 	tuple_field_delete(field);
 end:
 	/*
@@ -288,15 +336,16 @@ end:
 	 * fields of non-sequential keys. First field is always
 	 * simply accessible, so we don't store an offset for it.
 	 */
-	if (parent != NULL && parent->offset_slot == TUPLE_OFFSET_SLOT_NIL &&
+	if (parent->offset_slot == TUPLE_OFFSET_SLOT_NIL &&
 	    is_sequential == false && (fieldno > 0 || path != NULL)) {
 		*current_slot = *current_slot - 1;
 		parent->offset_slot = *current_slot;
 	}
 	return parent;
 fail:
-	parent = NULL;
-	goto cleanup;
+	if (field != NULL)
+		tuple_field_delete(field);
+	return NULL;
 }
 
 static int
@@ -444,8 +493,37 @@ tuple_format_create(struct tuple_format *format, struct key_def * const *keys,
 		return -1;
 	}
 	struct tuple_field *field;
+	uint32_t *required_fields = format->required_fields;
 	json_tree_foreach_entry_preorder(field, &format->fields.root,
 					 struct tuple_field, token) {
+		/*
+		 * In the case of the multikey index,
+		 * required_fields is overridden with local for
+		 * the JSON_TOKEN_ANY field bitmask. Restore
+		 * the main format->required_fields bitmask
+		 * when leaving the multikey subtree,
+		 */
+		if (!field->is_multikey_part &&
+		    required_fields != format->required_fields)
+			required_fields = format->required_fields;
+		/*
+		 * Override required_fields with a new local
+		 * bitmap for multikey index subtree.
+		 */
+		if (field->token.type == JSON_TOKEN_ANY) {
+			assert(required_fields == format->required_fields);
+			assert(field->multikey_required_fields == NULL);
+			void *multikey_required_fields =
+				calloc(1, required_fields_sz);
+			if (multikey_required_fields == NULL) {
+				diag_set(OutOfMemory, required_fields_sz,
+					"malloc", "required field bitmap");
+				return -1;
+			}
+			field->multikey_required_fields =
+				multikey_required_fields;
+			required_fields = multikey_required_fields;
+		}
 		/*
 		 * Mark all leaf non-nullable fields as required
 		 * by setting the corresponding bit in the bitmap
@@ -453,7 +531,7 @@ tuple_format_create(struct tuple_format *format, struct key_def * const *keys,
 		 */
 		if (json_token_is_leaf(&field->token) &&
 		    !tuple_field_is_nullable(field))
-			bit_set(format->required_fields, field->id);
+			bit_set(required_fields, field->id);
 	}
 	format->hash = tuple_format_hash(format);
 	return 0;
@@ -793,10 +871,11 @@ tuple_field_map_create(struct tuple_format *format, const char *tuple,
 	       entry.data != NULL) {
 		if (entry.field == NULL)
 			continue;
-		if (entry.field->offset_slot != TUPLE_OFFSET_SLOT_NIL) {
+		if (entry.field->offset_slot != TUPLE_OFFSET_SLOT_NIL &&
 		    field_map_builder_set_slot(builder, entry.field->offset_slot,
-		    			       entry.data - tuple);
-		}
+					entry.data - tuple, entry.multikey_idx,
+					entry.multikey_count, region) != 0)
+			return -1;
 	}
 	return entry.data == NULL ? 0 : -1;
 }
@@ -889,7 +968,9 @@ tuple_format_iterator_create(struct tuple_format_iterator *it,
 	it->format = format;
 	it->pos = tuple;
 	it->flags = flags;
+	it->multikey_frame = NULL;
 	it->required_fields = NULL;
+	it->multikey_required_fields = NULL;
 	it->required_fields_sz = 0;
 
 	uint32_t frames_sz = format->fields_depth * sizeof(struct mp_frame);
@@ -912,6 +993,8 @@ tuple_format_iterator_create(struct tuple_format_iterator *it,
 		it->required_fields = (char *)frames + frames_sz;
 		memcpy(it->required_fields, format->required_fields,
 		       it->required_fields_sz);
+		it->multikey_required_fields =
+			(char *)frames + frames_sz + it->required_fields_sz;
 	}
 	return 0;
 }
@@ -960,7 +1043,27 @@ tuple_format_iterator_next(struct tuple_format_iterator *it,
 		if (mp_stack_is_empty(&it->stack))
 			goto eof;
 		frame = mp_stack_top(&it->stack);
+		if (json_token_is_multikey(it->parent)) {
+			/*
+			 * All multikey index entries have been
+			 * processed. Reset pointer to the
+			 * corresponding multikey frame.
+			 */
+			it->multikey_frame = NULL;
+		}
 		it->parent = it->parent->parent;
+		if (json_token_is_multikey(it->parent)) {
+			/*
+			 * Processing of next multikey index
+			 * format:subtree has finished, test if
+			 * all required fields are present.
+			 */
+			if (it->flags & TUPLE_FORMAT_ITERATOR_VALIDATE &&
+			    tuple_format_required_fields_validate(it->format,
+						it->multikey_required_fields,
+						it->required_fields_sz) != 0)
+				return -1;
+		}
 	}
 	entry->parent =
 		it->parent != &it->format->fields.root ?
@@ -1014,15 +1117,46 @@ tuple_format_iterator_next(struct tuple_format_iterator *it,
 				mp_decode_map(&it->pos);
 		entry->count = size;
 		mp_stack_push(&it->stack, type, size);
+		if (json_token_is_multikey(&field->token)) {
+			/**
+			 * Keep a pointer to the frame that
+			 * describes an array with index
+			 * placeholder [*]. The "current" item
+			 * of this frame matches the logical
+			 * index of item in multikey index
+			 * and is equal to multikey index
+			 * comparison hint.
+			 */
+			assert(type == MP_ARRAY);
+			it->multikey_frame = mp_stack_top(&it->stack);
+		}
 		it->parent = &field->token;
 	} else {
 		entry->count = 0;
 		mp_next(&it->pos);
 	}
 	entry->data_end = it->pos;
+	if (it->multikey_frame != NULL) {
+		entry->multikey_count = it->multikey_frame->count;
+		entry->multikey_idx = it->multikey_frame->idx;
+	} else {
+		entry->multikey_count = 0;
+		entry->multikey_idx = -1;
+	}
 	if (field == NULL || (it->flags & TUPLE_FORMAT_ITERATOR_VALIDATE) == 0)
 		return 0;
 
+	if (field->token.type == JSON_TOKEN_ANY) {
+		/**
+		 * Start processing of next multikey
+		 * index element. Reset required_fields
+		 * bitmap.
+		 */
+		assert(it->multikey_frame != NULL);
+		assert(field->multikey_required_fields != NULL);
+		memcpy(it->multikey_required_fields,
+		       field->multikey_required_fields, it->required_fields_sz);
+	}
 	/*
 	 * Check if field mp_type is compatible with type
 	 * defined in format.
@@ -1035,7 +1169,8 @@ tuple_format_iterator_next(struct tuple_format_iterator *it,
 			 field_type_strs[field->type]);
 		return -1;
 	}
-	bit_clear(it->required_fields, field->id);
+	bit_clear(it->multikey_frame != NULL ?
+		  it->multikey_required_fields : it->required_fields, field->id);
 	return 0;
 eof:
 	if (it->flags & TUPLE_FORMAT_ITERATOR_VALIDATE &&
diff --git a/src/box/tuple_format.h b/src/box/tuple_format.h
index ea8721ea8..e4f5f0018 100644
--- a/src/box/tuple_format.h
+++ b/src/box/tuple_format.h
@@ -111,12 +111,21 @@ struct tuple_field {
 	int32_t offset_slot;
 	/** True if this field is used by an index. */
 	bool is_key_part;
+	/** True if this field is used by multikey index. */
+	bool is_multikey_part;
 	/** Action to perform if NULL constraint failed. */
 	enum on_conflict_action nullable_action;
 	/** Collation definition for string comparison */
 	struct coll *coll;
 	/** Collation identifier. */
 	uint32_t coll_id;
+	/**
+	 * Bitmap of fields that must be present in a tuple
+	 * conforming to the multikey subtree. Not NULL only
+	 * when tuple_field:token.type == JSON_TOKEN_ANY.
+	 * Indexed by tuple_field::id.
+	 */
+	void *multikey_required_fields;
 	/** Link in tuple_format::fields. */
 	struct json_token token;
 };
@@ -170,7 +179,9 @@ struct tuple_format {
 	 */
 	bool is_ephemeral;
 	/**
-	 * Size of field map of tuple in bytes.
+	 * Size of minimal field map of tuple where each indexed
+	 * field has own offset slot (in bytes). The real tuple
+	 * field_map may be bigger in case of multikey indexes.
 	 * \sa struct field_map_builder
 	 */
 	uint16_t field_map_size;
@@ -451,6 +462,12 @@ struct tuple_format_iterator {
 	 * (format::fields_depth).
 	 */
 	struct mp_stack stack;
+	/**
+	 * The pointer to the stack frame representing an array
+	 * filed that has JSON_TOKEN_ANY child, i.e. the root
+	 * of the multikey index.
+	 */
+	struct mp_frame *multikey_frame;
 	/**
 	 * The pointer to the parent node in the format::fields
 	 * JSON tree. Is required for relative lookup for the
@@ -468,6 +485,12 @@ struct tuple_format_iterator {
 	 * Not NULL iff validate == true.
 	 */
 	void *required_fields;
+	/**
+	 * Field bitmap that is used for checking that all
+	 * mandatory fields of multikey subtree are present.
+	 * Not NULL iff validate == true.
+	 */
+	void *multikey_required_fields;
 };
 
 /** Tuple format iterator next method's returning entry. */
@@ -499,6 +522,18 @@ struct tuple_format_iterator_entry {
 	 * (field->type in FIELD_TYPE_ARRAY, FIELD_TYPE_MAP).
 	 */
 	int count;
+	/**
+	 * Number of multikey items. Is defined when iterator is
+	 * positioned on tuple field is related to format's
+	 * multikey subtree (there was a parent field1 that
+	 * json_token_is_multikey(&field1->token) == true)
+	 */
+	int multikey_count;
+	/**
+	 * Index of the key in the multikey array. Is defined
+	 * when multikey_count is defined.
+	 */
+	int multikey_idx;
 };
 
 /**
diff --git a/src/box/vinyl.c b/src/box/vinyl.c
index 41918beba..f63383f87 100644
--- a/src/box/vinyl.c
+++ b/src/box/vinyl.c
@@ -701,6 +701,11 @@ vinyl_space_check_index_def(struct space *space, struct index_def *index_def)
 			return -1;
 		}
 	}
+	if (key_def_is_multikey(index_def->key_def)) {
+		diag_set(ClientError, ER_UNSUPPORTED,
+			 "Vinyl", "multikey indexes");
+		return -1;
+	}
 	return 0;
 }
 
@@ -1018,6 +1023,8 @@ vinyl_index_def_change_requires_rebuild(struct index *index,
 				  TUPLE_INDEX_BASE) != 0)
 			return true;
 	}
+	assert(key_def_is_multikey(old_cmp_def) ==
+	       key_def_is_multikey(new_cmp_def));
 	return false;
 }
 
diff --git a/test/box/misc.result b/test/box/misc.result
index a1f7a0990..a2ee3ad9f 100644
--- a/test/box/misc.result
+++ b/test/box/misc.result
@@ -522,6 +522,7 @@ t;
   191: box.error.SQL_PARSER_LIMIT
   192: box.error.INDEX_DEF_UNSUPPORTED
   193: box.error.CK_DEF_UNSUPPORTED
+  194: box.error.MULTIKEY_INDEX_MISMATCH
 ...
 test_run:cmd("setopt delimiter ''");
 ---
diff --git a/test/engine/engine.cfg b/test/engine/engine.cfg
index 9f07629b4..8f34bae88 100644
--- a/test/engine/engine.cfg
+++ b/test/engine/engine.cfg
@@ -2,6 +2,9 @@
     "*": {
         "memtx": {"engine": "memtx"}, 
         "vinyl": {"engine": "vinyl"}
+    },
+    "multikey.test.lua": {
+        "memtx": {"engine": "memtx"}
     }
 }
 
diff --git a/test/engine/json.result b/test/engine/json.result
index 84b1309e1..e5a36a8f5 100644
--- a/test/engine/json.result
+++ b/test/engine/json.result
@@ -722,16 +722,3 @@ s:delete(5)
 s:drop()
 ---
 ...
---
--- gh-1260: Multikey indexes
---
-s = box.schema.space.create('withdata')
----
-...
-idx = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
----
-- error: Tarantool does not support multikey indexes
-...
-s:drop()
----
-...
diff --git a/test/engine/json.test.lua b/test/engine/json.test.lua
index e864ec14d..592706e0e 100644
--- a/test/engine/json.test.lua
+++ b/test/engine/json.test.lua
@@ -206,10 +206,3 @@ idx0 = s:create_index('idx2', {parts = {{3, 'str', path = '[1].fname'}, {3, 'str
 s:insert({5, {1, 1, 1}, {{fname='A', sname='B'}, {fname='C', sname='D'}, {fname='A', sname='B'}}})
 s:delete(5)
 s:drop()
-
---
--- gh-1260: Multikey indexes
---
-s = box.schema.space.create('withdata')
-idx = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
-s:drop()
diff --git a/test/engine/multikey.result b/test/engine/multikey.result
new file mode 100644
index 000000000..293e27f1c
--- /dev/null
+++ b/test/engine/multikey.result
@@ -0,0 +1,789 @@
+test_run = require('test_run').new()
+---
+...
+engine = test_run:get_cfg('engine')
+---
+...
+--
+-- gh-1260: Multikey indexes.
+--
+s = box.schema.space.create('withdata', {engine = 'vinyl'})
+---
+...
+pk = s:create_index('pk')
+---
+...
+-- Vinyl's space can't be multikey (yet).
+_ = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
+---
+- error: Vinyl does not support multikey indexes
+...
+s:drop()
+---
+...
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+-- Primary index must be unique so it can't be multikey.
+_ = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}}})
+---
+- error: 'Can''t create or modify index ''idx'' in space ''withdata'': primary key
+    cannot be multikey'
+...
+pk = s:create_index('pk')
+---
+...
+-- Only tree index type may be mutlikey.
+_ = s:create_index('idx', {type = 'hash', unique = true, parts = {{3, 'str', path = '[*].fname'}}})
+---
+- error: 'Can''t create or modify index ''idx'' in space ''withdata'': HASH index
+    cannot be multikey'
+...
+_ = s:create_index('idx', {type = 'bitset', unique = false, parts = {{3, 'str', path = '[*].fname'}}})
+---
+- error: 'Can''t create or modify index ''idx'' in space ''withdata'': BITSET index
+    cannot be multikey'
+...
+_ = s:create_index('idx', {type = 'rtree', unique = false, parts = {{3, 'array', path = '[*].fname'}}})
+---
+- error: 'Can''t create or modify index ''idx'' in space ''withdata'': RTREE index
+    cannot be multikey'
+...
+-- Test incompatible multikey index parts.
+_ = s:create_index('idx3', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '["data"][*].sname'}}})
+---
+- error: 'Wrong index options (field 2): incompatable multikey index path'
+...
+_ = s:create_index('idx2', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname[*].a'}}})
+---
+- error: 'Wrong index options (field 2): no more than one array index placeholder
+    [*] is allowed in JSON path'
+...
+idx0 = s:create_index('idx0', {parts = {{3, 'str', path = '[1].fname'}}})
+---
+...
+_ = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
+---
+- error: Field 3 is used as multikey in one index and as single key in another
+...
+idx0:drop()
+---
+...
+-- Unique multikey index.
+idx = s:create_index('idx', {unique = true, parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
+---
+...
+_ = s:create_index('idx2', {parts = {{3, 'str', path = '[1].fname'}, {3, 'str', path = '[1].sname'}}})
+---
+- error: Field 3 is used as multikey in one index and as single key in another
+...
+s:insert({1, {1, 2, 3}, {{fname='James', sname='Bond'}, {fname='Vasya', sname='Pupkin'}}})
+---
+- [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+s:insert({2, {3, 4, 5}, {{fname='Ivan', sname='Ivanych'}}})
+---
+- [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+...
+_ = s:create_index('arr_idx', {unique = true, parts = {{2, 'unsigned', path = '[*]'}}})
+---
+- error: Duplicate key exists in unique index 'arr_idx' in space 'withdata'
+...
+-- Non-unique multikey index; two multikey indexes per space.
+arr_idx = s:create_index('arr_idx', {unique = false, parts = {{2, 'unsigned', path = '[*]'}}})
+---
+...
+arr_idx:select()
+---
+- - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+...
+idx:get({'James', 'Bond'})
+---
+- [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+idx:get({'Ivan', 'Ivanych'})
+---
+- [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+...
+idx:get({'Vasya', 'Pupkin'})
+---
+- [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+idx:select()
+---
+- - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+s:insert({3, {1, 2}, {{fname='Vasya', sname='Pupkin'}}})
+---
+- error: Duplicate key exists in unique index 'idx' in space 'withdata'
+...
+s:insert({4, {1}, {{fname='James', sname='Bond'}}})
+---
+- error: Duplicate key exists in unique index 'idx' in space 'withdata'
+...
+idx:select()
+---
+- - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+-- Duplicates in multikey parts.
+s:insert({5, {1, 1, 1}, {{fname='A', sname='B'}, {fname='C', sname='D'}, {fname='A', sname='B'}}})
+---
+- [5, [1, 1, 1], [{'fname': 'A', 'sname': 'B'}, {'fname': 'C', 'sname': 'D'}, {'fname': 'A',
+      'sname': 'B'}]]
+...
+arr_idx:select({1})
+---
+- - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [5, [1, 1, 1], [{'fname': 'A', 'sname': 'B'}, {'fname': 'C', 'sname': 'D'}, {
+        'fname': 'A', 'sname': 'B'}]]
+...
+s:delete(5)
+---
+- [5, [1, 1, 1], [{'fname': 'A', 'sname': 'B'}, {'fname': 'C', 'sname': 'D'}, {'fname': 'A',
+      'sname': 'B'}]]
+...
+-- Check that there is no garbage in index.
+arr_idx:select({1})
+---
+- - [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+idx:get({'A', 'B'})
+---
+...
+idx:get({'C', 'D'})
+---
+...
+idx:delete({'Vasya', 'Pupkin'})
+---
+- [1, [1, 2, 3], [{'fname': 'James', 'sname': 'Bond'}, {'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+s:insert({6, {1, 2}, {{fname='Vasya', sname='Pupkin'}}})
+---
+- [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+s:insert({7, {1}, {{fname='James', sname='Bond'}}})
+---
+- [7, [1], [{'fname': 'James', 'sname': 'Bond'}]]
+...
+arr_idx:select({1})
+---
+- - [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [7, [1], [{'fname': 'James', 'sname': 'Bond'}]]
+...
+idx:select()
+---
+- - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [7, [1], [{'fname': 'James', 'sname': 'Bond'}]]
+  - [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+-- Snapshot & recovery.
+box.snapshot()
+---
+- ok
+...
+test_run:cmd("restart server default")
+s = box.space["withdata"]
+---
+...
+idx = s.index["idx"]
+---
+...
+arr_idx = s.index["arr_idx"]
+---
+...
+s:select()
+---
+- - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [7, [1], [{'fname': 'James', 'sname': 'Bond'}]]
+...
+idx:select()
+---
+- - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [7, [1], [{'fname': 'James', 'sname': 'Bond'}]]
+  - [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+...
+arr_idx:select()
+---
+- - [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [7, [1], [{'fname': 'James', 'sname': 'Bond'}]]
+  - [6, [1, 2], [{'fname': 'Vasya', 'sname': 'Pupkin'}]]
+  - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+  - [2, [3, 4, 5], [{'fname': 'Ivan', 'sname': 'Ivanych'}]]
+...
+s:drop()
+---
+...
+-- Assymetric multikey index paths.
+test_run = require('test_run').new()
+---
+...
+engine = test_run:get_cfg('engine')
+---
+...
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].extra.sname', is_nullable = true}}})
+---
+...
+s:insert({1, 1, {{fname='A1', extra={sname='A2'}}, {fname='B1'}, {fname='C1', extra={sname='C2'}}}})
+---
+- [1, 1, [{'fname': 'A1', 'extra': {'sname': 'A2'}}, {'fname': 'B1'}, {'fname': 'C1',
+      'extra': {'sname': 'C2'}}]]
+...
+s:drop()
+---
+...
+-- Unique multikey index features.
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx0 = s:create_index('idx0', {parts = {{2, 'int', path = '[*]'}}})
+---
+...
+s:insert({1, {1, 1, 1}})
+---
+- [1, [1, 1, 1]]
+...
+s:insert({2, {2, 2}})
+---
+- [2, [2, 2]]
+...
+s:insert({3, {3, 3, 2, 2, 1, 1}})
+---
+- error: Duplicate key exists in unique index 'idx0' in space 'withdata'
+...
+idx0:get(2)
+---
+- [2, [2, 2]]
+...
+idx0:get(1)
+---
+- [1, [1, 1, 1]]
+...
+idx0:get(3)
+---
+...
+idx0:select()
+---
+- - [1, [1, 1, 1]]
+  - [2, [2, 2]]
+...
+idx0:delete(2)
+---
+- [2, [2, 2]]
+...
+idx0:get(2)
+---
+...
+idx0:select()
+---
+- - [1, [1, 1, 1]]
+...
+s:drop()
+---
+...
+-- Test user JSON endpoint doesn't fail in case of multikey index.
+t = box.tuple.new{1, {a = 1, b = 2}, 3}
+---
+...
+t['[2][*]']
+---
+- null
+...
+-- Test multikey index deduplication on recovery.
+test_run = require('test_run').new()
+---
+...
+engine = test_run:get_cfg('engine')
+---
+...
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx0 = s:create_index('idx0', {parts = {{2, 'int', path = '[*]', is_nullable = true}}})
+---
+...
+s:insert({1, {1, 1, 3, 1}})
+---
+- [1, [1, 1, 3, 1]]
+...
+idx0:select()
+---
+- - [1, [1, 1, 3, 1]]
+  - [1, [1, 1, 3, 1]]
+...
+s:replace({1, {5, 5, 5, 1, 3, 3}})
+---
+- [1, [5, 5, 5, 1, 3, 3]]
+...
+idx0:select()
+---
+- - [1, [5, 5, 5, 1, 3, 3]]
+  - [1, [5, 5, 5, 1, 3, 3]]
+  - [1, [5, 5, 5, 1, 3, 3]]
+...
+-- Test update.
+s:update(1, {{'=', 2, {20, 10, 30, 30}}})
+---
+- [1, [20, 10, 30, 30]]
+...
+idx0:select()
+---
+- - [1, [20, 10, 30, 30]]
+  - [1, [20, 10, 30, 30]]
+  - [1, [20, 10, 30, 30]]
+...
+box.snapshot()
+---
+- ok
+...
+test_run:cmd("restart server default")
+s = box.space.withdata
+---
+...
+s:select()
+---
+- - [1, [20, 10, 30, 30]]
+...
+idx0 = s.index.idx0
+---
+...
+idx0:select()
+---
+- - [1, [20, 10, 30, 30]]
+  - [1, [20, 10, 30, 30]]
+  - [1, [20, 10, 30, 30]]
+...
+s:insert({2, {2, 4, 2}})
+---
+- [2, [2, 4, 2]]
+...
+s:select()
+---
+- - [1, [20, 10, 30, 30]]
+  - [2, [2, 4, 2]]
+...
+idx0:select()
+---
+- - [2, [2, 4, 2]]
+  - [2, [2, 4, 2]]
+  - [1, [20, 10, 30, 30]]
+  - [1, [20, 10, 30, 30]]
+  - [1, [20, 10, 30, 30]]
+...
+s:drop()
+---
+...
+-- Test upsert & reverse iterators.
+test_run = require('test_run').new()
+---
+...
+engine = test_run:get_cfg('engine')
+---
+...
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx0 = s:create_index('idx0', {unique=false, parts = {{2, 'int', path = '[*]'}}})
+---
+...
+s:insert({1, {1, 1, 1, 2, 2}})
+---
+- [1, [1, 1, 1, 2, 2]]
+...
+s:insert({2, {3, 3, 4, 4, 4}})
+---
+- [2, [3, 3, 4, 4, 4]]
+...
+s:insert({3, {5, 5, 5, 5, 6, 6, 6, 6}})
+---
+- [3, [5, 5, 5, 5, 6, 6, 6, 6]]
+...
+idx0:select(5, {iterator = box.index.LT})
+---
+- - [2, [3, 3, 4, 4, 4]]
+  - [2, [3, 3, 4, 4, 4]]
+  - [1, [1, 1, 1, 2, 2]]
+  - [1, [1, 1, 1, 2, 2]]
+...
+idx0:select(5, {iterator = box.index.GE})
+---
+- - [3, [5, 5, 5, 5, 6, 6, 6, 6]]
+  - [3, [5, 5, 5, 5, 6, 6, 6, 6]]
+...
+idx0:select()
+---
+- - [1, [1, 1, 1, 2, 2]]
+  - [1, [1, 1, 1, 2, 2]]
+  - [2, [3, 3, 4, 4, 4]]
+  - [2, [3, 3, 4, 4, 4]]
+  - [3, [5, 5, 5, 5, 6, 6, 6, 6]]
+  - [3, [5, 5, 5, 5, 6, 6, 6, 6]]
+...
+s:upsert({3, {5, 5, 5, 5, 6, 6, 6, 6}}, {{'=', 2, {1, 1, 2, 2, 3, 3, 4, 4}}})
+---
+...
+idx0:select()
+---
+- - [1, [1, 1, 1, 2, 2]]
+  - [3, [1, 1, 2, 2, 3, 3, 4, 4]]
+  - [1, [1, 1, 1, 2, 2]]
+  - [3, [1, 1, 2, 2, 3, 3, 4, 4]]
+  - [2, [3, 3, 4, 4, 4]]
+  - [3, [1, 1, 2, 2, 3, 3, 4, 4]]
+  - [2, [3, 3, 4, 4, 4]]
+  - [3, [1, 1, 2, 2, 3, 3, 4, 4]]
+...
+s:drop()
+---
+...
+-- Test multikey index with epsent data (1 part, is_nullable = false).
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx0 = s:create_index('idx0', {parts = {{2, 'str', path = '[*].name'}}})
+---
+...
+s:insert({0, {{fname='A0'}, {fname='B0'}, {fname='C0'}}})
+---
+- error: Tuple field [2][*]["name"] required by space format is missing
+...
+s:insert({0, {{fname='A0'}, {fname='B0', name='ZB1'}, {fname='C0'}}})
+---
+- error: Tuple field [2][*]["name"] required by space format is missing
+...
+s:insert({0, {{fname='A0', name='ZA1'}, {fname='B0', name='ZB1'}, {fname='C0'}}})
+---
+- error: Tuple field [2][*]["name"] required by space format is missing
+...
+s:insert({0, {{fname='A0', name='ZA1'}, {fname='B0', name='ZB1'}, {fname='C0', name='ZC1'}}})
+---
+- [0, [{'name': 'ZA1', 'fname': 'A0'}, {'name': 'ZB1', 'fname': 'B0'}, {'name': 'ZC1',
+      'fname': 'C0'}]]
+...
+s:drop()
+---
+...
+-- Test multikey replacement conflict.
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx0 = s:create_index('idx0', {parts = {{2, 'str', path = '[*].name', is_nullable=true}}})
+---
+...
+s:insert({0, {{fname='A0'}, {fname='B0'}, {fname='C0', name='CONFLICT1'}}})
+---
+- [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'name': 'CONFLICT1', 'fname': 'C0'}]]
+...
+s:insert({1, {{fname='A1'}, {fname='B1'}, {fname='C1', name='CONFLICT2'}}})
+---
+- [1, [{'fname': 'A1'}, {'fname': 'B1'}, {'name': 'CONFLICT2', 'fname': 'C1'}]]
+...
+s:insert({2, {{fname='A2_1'}, {fname='B2_1', name='ZB2_1'}, {fname='C2_1'}, {name="DUP"}, {name="DUP"}}})
+---
+- [2, [{'fname': 'A2_1'}, {'name': 'ZB2_1', 'fname': 'B2_1'}, {'fname': 'C2_1'}, {
+      'name': 'DUP'}, {'name': 'DUP'}]]
+...
+s:replace({2, {{fname='A2_2'}, {fname='B2_2', name='ZB2_2'}, {fname='C2_2'}, {name="DUP"}, {name="DUP"}}})
+---
+- [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'}, {
+      'name': 'DUP'}, {'name': 'DUP'}]]
+...
+s:replace({2, {{fname='A2_3'}, {fname='B2_3', name='ZB2_3'}, {fname='C2_3'}, {name="DUP"}, {name='CONFLICT1'}, {name='CONFLICT2'}, {name="DUP"}}})
+---
+- error: Duplicate key exists in unique index 'idx0' in space 'withdata'
+...
+s:replace({2, {{fname='A2_4'}, {fname='B2_4', name='ZB2_4'}, {fname='C2_4'}, {name="DUP"}, {name='CONFLICT2'}, {name='CONFLICT1'}, {name="DUP"}}})
+---
+- error: Duplicate key exists in unique index 'idx0' in space 'withdata'
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'name': 'CONFLICT1', 'fname': 'C0'}]]
+  - [1, [{'fname': 'A1'}, {'fname': 'B1'}, {'name': 'CONFLICT2', 'fname': 'C1'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'name': 'CONFLICT1', 'fname': 'C0'}]]
+  - [1, [{'fname': 'A1'}, {'fname': 'B1'}, {'name': 'CONFLICT2', 'fname': 'C1'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+box.snapshot()
+---
+- ok
+...
+test_run:cmd("restart server default")
+s = box.space.withdata
+---
+...
+idx0 = s.index.idx0
+---
+...
+s:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'name': 'CONFLICT1', 'fname': 'C0'}]]
+  - [1, [{'fname': 'A1'}, {'fname': 'B1'}, {'name': 'CONFLICT2', 'fname': 'C1'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'name': 'CONFLICT1', 'fname': 'C0'}]]
+  - [1, [{'fname': 'A1'}, {'fname': 'B1'}, {'name': 'CONFLICT2', 'fname': 'C1'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'name': 'CONFLICT1', 'fname': 'C0'}]]
+  - [1, [{'fname': 'A1'}, {'fname': 'B1'}, {'name': 'CONFLICT2', 'fname': 'C1'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2_2'}, {'name': 'ZB2_2', 'fname': 'B2_2'}, {'fname': 'C2_2'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+s:drop()
+---
+...
+-- Test multikey index with epsent data (2 parts, is_nullable = true).
+test_run = require('test_run').new()
+---
+...
+engine = test_run:get_cfg('engine')
+---
+...
+s = box.schema.space.create('withdata', {engine = engine})
+---
+...
+pk = s:create_index('pk')
+---
+...
+idx0 = s:create_index('idx0', {unique=false, parts = {{2, 'str', path = '[*].name', is_nullable=true}}})
+---
+...
+-- No idx0 index data at all.
+s:insert({0, {{fname='A0'}, {fname='B0'}, {fname='C0'}}})
+---
+- [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+...
+-- Only one field corresponds idx0.
+s:insert({1, {{fname='A1'}, {fname='B1', name='ZB1'}, {fname='C1'}}})
+---
+- [1, [{'fname': 'A1'}, {'name': 'ZB1', 'fname': 'B1'}, {'fname': 'C1'}]]
+...
+s:insert({2, {{fname='A2'}, {fname='B2', name='ZB2'}, {fname='C2'}, {name="DUP"}, {name="DUP"}}})
+---
+- [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+    {'name': 'DUP'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [1, [{'fname': 'A1'}, {'name': 'ZB1', 'fname': 'B1'}, {'fname': 'C1'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'fname': 'A1'}, {'name': 'ZB1', 'fname': 'B1'}, {'fname': 'C1'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+...
+s:replace({1, {{fname='A3'}, {fname='B3', name='ZB3'}, {fname='C3'}}})
+---
+- [1, [{'fname': 'A3'}, {'name': 'ZB3', 'fname': 'B3'}, {'fname': 'C3'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [1, [{'fname': 'A3'}, {'name': 'ZB3', 'fname': 'B3'}, {'fname': 'C3'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'fname': 'A3'}, {'name': 'ZB3', 'fname': 'B3'}, {'fname': 'C3'}]]
+...
+s:replace({1, {{fname='A4', name='ZA4'}, {fname='B4', name='ZB4'}, {fname='C4', name='ZC4'}, {name="DUP"}, {name="DUP"}, {name="DUP"}}})
+---
+- [1, [{'name': 'ZA4', 'fname': 'A4'}, {'name': 'ZB4', 'fname': 'B4'}, {'name': 'ZC4',
+      'fname': 'C4'}, {'name': 'DUP'}, {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA4', 'fname': 'A4'}, {'name': 'ZB4', 'fname': 'B4'}, {'name': 'ZC4',
+        'fname': 'C4'}, {'name': 'DUP'}, {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA4', 'fname': 'A4'}, {'name': 'ZB4', 'fname': 'B4'}, {'name': 'ZC4',
+        'fname': 'C4'}, {'name': 'DUP'}, {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA4', 'fname': 'A4'}, {'name': 'ZB4', 'fname': 'B4'}, {'name': 'ZC4',
+        'fname': 'C4'}, {'name': 'DUP'}, {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA4', 'fname': 'A4'}, {'name': 'ZB4', 'fname': 'B4'}, {'name': 'ZC4',
+        'fname': 'C4'}, {'name': 'DUP'}, {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+s:replace({1, {{fname='A5', name='ZA5'}, {fname='B5'}, {fname='C5'}, {name="DUP"}, {name="DUP"}, {name="DUP"}}})
+---
+- [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+    {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+...
+s:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+...
+box.snapshot()
+---
+- ok
+...
+test_run:cmd("restart server default")
+s = box.space.withdata
+---
+...
+idx0 = s.index.idx0
+---
+...
+s:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+...
+idx0:select()
+---
+- - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+...
+-- Test multikey index alter.
+idx0:alter({parts = {{2, 'str', path = '[*].fname', is_nullable=true}}})
+---
+...
+idx0:select()
+---
+- - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+  - [0, [{'fname': 'A0'}, {'fname': 'B0'}, {'fname': 'C0'}]]
+  - [2, [{'fname': 'A2'}, {'name': 'ZB2', 'fname': 'B2'}, {'fname': 'C2'}, {'name': 'DUP'},
+      {'name': 'DUP'}]]
+  - [1, [{'name': 'ZA5', 'fname': 'A5'}, {'fname': 'B5'}, {'fname': 'C5'}, {'name': 'DUP'},
+      {'name': 'DUP'}, {'name': 'DUP'}]]
+...
+s:drop()
+---
+...
+-- Create unique multikey index on space with tuple which
+-- contains the same key multiple times.
+test_run = require('test_run').new()
+---
+...
+engine = test_run:get_cfg('engine')
+---
+...
+s = box.schema.space.create('test', {engine = engine})
+---
+...
+i = s:create_index('pk')
+---
+...
+s:replace{1, {{1, 1}}}
+---
+- [1, [[1, 1]]]
+...
+s:replace{2, {{2, 3}}}
+---
+- [2, [[2, 3]]]
+...
+i2 = s:create_index('sk', {parts = {{2, 'unsigned', path = '[1][*]'}}})
+---
+...
+i2:select()
+---
+- - [1, [[1, 1]]]
+  - [2, [[2, 3]]]
+  - [2, [[2, 3]]]
+...
+s:drop()
+---
+...
diff --git a/test/engine/multikey.test.lua b/test/engine/multikey.test.lua
new file mode 100644
index 000000000..0916bf527
--- /dev/null
+++ b/test/engine/multikey.test.lua
@@ -0,0 +1,206 @@
+test_run = require('test_run').new()
+engine = test_run:get_cfg('engine')
+
+--
+-- gh-1260: Multikey indexes.
+--
+s = box.schema.space.create('withdata', {engine = 'vinyl'})
+pk = s:create_index('pk')
+-- Vinyl's space can't be multikey (yet).
+_ = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
+s:drop()
+
+s = box.schema.space.create('withdata', {engine = engine})
+-- Primary index must be unique so it can't be multikey.
+_ = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}}})
+pk = s:create_index('pk')
+-- Only tree index type may be mutlikey.
+_ = s:create_index('idx', {type = 'hash', unique = true, parts = {{3, 'str', path = '[*].fname'}}})
+_ = s:create_index('idx', {type = 'bitset', unique = false, parts = {{3, 'str', path = '[*].fname'}}})
+_ = s:create_index('idx', {type = 'rtree', unique = false, parts = {{3, 'array', path = '[*].fname'}}})
+-- Test incompatible multikey index parts.
+_ = s:create_index('idx3', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '["data"][*].sname'}}})
+_ = s:create_index('idx2', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname[*].a'}}})
+idx0 = s:create_index('idx0', {parts = {{3, 'str', path = '[1].fname'}}})
+_ = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
+idx0:drop()
+-- Unique multikey index.
+idx = s:create_index('idx', {unique = true, parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].sname'}}})
+_ = s:create_index('idx2', {parts = {{3, 'str', path = '[1].fname'}, {3, 'str', path = '[1].sname'}}})
+s:insert({1, {1, 2, 3}, {{fname='James', sname='Bond'}, {fname='Vasya', sname='Pupkin'}}})
+s:insert({2, {3, 4, 5}, {{fname='Ivan', sname='Ivanych'}}})
+_ = s:create_index('arr_idx', {unique = true, parts = {{2, 'unsigned', path = '[*]'}}})
+-- Non-unique multikey index; two multikey indexes per space.
+arr_idx = s:create_index('arr_idx', {unique = false, parts = {{2, 'unsigned', path = '[*]'}}})
+arr_idx:select()
+idx:get({'James', 'Bond'})
+idx:get({'Ivan', 'Ivanych'})
+idx:get({'Vasya', 'Pupkin'})
+idx:select()
+s:insert({3, {1, 2}, {{fname='Vasya', sname='Pupkin'}}})
+s:insert({4, {1}, {{fname='James', sname='Bond'}}})
+idx:select()
+-- Duplicates in multikey parts.
+s:insert({5, {1, 1, 1}, {{fname='A', sname='B'}, {fname='C', sname='D'}, {fname='A', sname='B'}}})
+arr_idx:select({1})
+s:delete(5)
+-- Check that there is no garbage in index.
+arr_idx:select({1})
+idx:get({'A', 'B'})
+idx:get({'C', 'D'})
+idx:delete({'Vasya', 'Pupkin'})
+s:insert({6, {1, 2}, {{fname='Vasya', sname='Pupkin'}}})
+s:insert({7, {1}, {{fname='James', sname='Bond'}}})
+arr_idx:select({1})
+idx:select()
+-- Snapshot & recovery.
+box.snapshot()
+test_run:cmd("restart server default")
+s = box.space["withdata"]
+idx = s.index["idx"]
+arr_idx = s.index["arr_idx"]
+s:select()
+idx:select()
+arr_idx:select()
+s:drop()
+
+-- Assymetric multikey index paths.
+test_run = require('test_run').new()
+engine = test_run:get_cfg('engine')
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx = s:create_index('idx', {parts = {{3, 'str', path = '[*].fname'}, {3, 'str', path = '[*].extra.sname', is_nullable = true}}})
+s:insert({1, 1, {{fname='A1', extra={sname='A2'}}, {fname='B1'}, {fname='C1', extra={sname='C2'}}}})
+s:drop()
+
+-- Unique multikey index features.
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx0 = s:create_index('idx0', {parts = {{2, 'int', path = '[*]'}}})
+s:insert({1, {1, 1, 1}})
+s:insert({2, {2, 2}})
+s:insert({3, {3, 3, 2, 2, 1, 1}})
+idx0:get(2)
+idx0:get(1)
+idx0:get(3)
+idx0:select()
+idx0:delete(2)
+idx0:get(2)
+idx0:select()
+s:drop()
+
+-- Test user JSON endpoint doesn't fail in case of multikey index.
+t = box.tuple.new{1, {a = 1, b = 2}, 3}
+t['[2][*]']
+
+-- Test multikey index deduplication on recovery.
+test_run = require('test_run').new()
+engine = test_run:get_cfg('engine')
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx0 = s:create_index('idx0', {parts = {{2, 'int', path = '[*]', is_nullable = true}}})
+s:insert({1, {1, 1, 3, 1}})
+idx0:select()
+s:replace({1, {5, 5, 5, 1, 3, 3}})
+idx0:select()
+-- Test update.
+s:update(1, {{'=', 2, {20, 10, 30, 30}}})
+idx0:select()
+box.snapshot()
+test_run:cmd("restart server default")
+s = box.space.withdata
+s:select()
+idx0 = s.index.idx0
+idx0:select()
+s:insert({2, {2, 4, 2}})
+s:select()
+idx0:select()
+s:drop()
+
+-- Test upsert & reverse iterators.
+test_run = require('test_run').new()
+engine = test_run:get_cfg('engine')
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx0 = s:create_index('idx0', {unique=false, parts = {{2, 'int', path = '[*]'}}})
+s:insert({1, {1, 1, 1, 2, 2}})
+s:insert({2, {3, 3, 4, 4, 4}})
+s:insert({3, {5, 5, 5, 5, 6, 6, 6, 6}})
+idx0:select(5, {iterator = box.index.LT})
+idx0:select(5, {iterator = box.index.GE})
+idx0:select()
+s:upsert({3, {5, 5, 5, 5, 6, 6, 6, 6}}, {{'=', 2, {1, 1, 2, 2, 3, 3, 4, 4}}})
+idx0:select()
+s:drop()
+
+-- Test multikey index with epsent data (1 part, is_nullable = false).
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx0 = s:create_index('idx0', {parts = {{2, 'str', path = '[*].name'}}})
+s:insert({0, {{fname='A0'}, {fname='B0'}, {fname='C0'}}})
+s:insert({0, {{fname='A0'}, {fname='B0', name='ZB1'}, {fname='C0'}}})
+s:insert({0, {{fname='A0', name='ZA1'}, {fname='B0', name='ZB1'}, {fname='C0'}}})
+s:insert({0, {{fname='A0', name='ZA1'}, {fname='B0', name='ZB1'}, {fname='C0', name='ZC1'}}})
+s:drop()
+
+-- Test multikey replacement conflict.
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx0 = s:create_index('idx0', {parts = {{2, 'str', path = '[*].name', is_nullable=true}}})
+s:insert({0, {{fname='A0'}, {fname='B0'}, {fname='C0', name='CONFLICT1'}}})
+s:insert({1, {{fname='A1'}, {fname='B1'}, {fname='C1', name='CONFLICT2'}}})
+s:insert({2, {{fname='A2_1'}, {fname='B2_1', name='ZB2_1'}, {fname='C2_1'}, {name="DUP"}, {name="DUP"}}})
+s:replace({2, {{fname='A2_2'}, {fname='B2_2', name='ZB2_2'}, {fname='C2_2'}, {name="DUP"}, {name="DUP"}}})
+s:replace({2, {{fname='A2_3'}, {fname='B2_3', name='ZB2_3'}, {fname='C2_3'}, {name="DUP"}, {name='CONFLICT1'}, {name='CONFLICT2'}, {name="DUP"}}})
+s:replace({2, {{fname='A2_4'}, {fname='B2_4', name='ZB2_4'}, {fname='C2_4'}, {name="DUP"}, {name='CONFLICT2'}, {name='CONFLICT1'}, {name="DUP"}}})
+idx0:select()
+box.snapshot()
+test_run:cmd("restart server default")
+s = box.space.withdata
+idx0 = s.index.idx0
+s:select()
+idx0:select()
+s:drop()
+
+-- Test multikey index with epsent data (2 parts, is_nullable = true).
+test_run = require('test_run').new()
+engine = test_run:get_cfg('engine')
+s = box.schema.space.create('withdata', {engine = engine})
+pk = s:create_index('pk')
+idx0 = s:create_index('idx0', {unique=false, parts = {{2, 'str', path = '[*].name', is_nullable=true}}})
+-- No idx0 index data at all.
+s:insert({0, {{fname='A0'}, {fname='B0'}, {fname='C0'}}})
+idx0:select()
+-- Only one field corresponds idx0.
+s:insert({1, {{fname='A1'}, {fname='B1', name='ZB1'}, {fname='C1'}}})
+s:insert({2, {{fname='A2'}, {fname='B2', name='ZB2'}, {fname='C2'}, {name="DUP"}, {name="DUP"}}})
+idx0:select()
+s:replace({1, {{fname='A3'}, {fname='B3', name='ZB3'}, {fname='C3'}}})
+idx0:select()
+s:replace({1, {{fname='A4', name='ZA4'}, {fname='B4', name='ZB4'}, {fname='C4', name='ZC4'}, {name="DUP"}, {name="DUP"}, {name="DUP"}}})
+idx0:select()
+s:replace({1, {{fname='A5', name='ZA5'}, {fname='B5'}, {fname='C5'}, {name="DUP"}, {name="DUP"}, {name="DUP"}}})
+idx0:select()
+s:select()
+box.snapshot()
+test_run:cmd("restart server default")
+s = box.space.withdata
+idx0 = s.index.idx0
+s:select()
+idx0:select()
+-- Test multikey index alter.
+idx0:alter({parts = {{2, 'str', path = '[*].fname', is_nullable=true}}})
+idx0:select()
+s:drop()
+
+-- Create unique multikey index on space with tuple which
+-- contains the same key multiple times.
+test_run = require('test_run').new()
+engine = test_run:get_cfg('engine')
+s = box.schema.space.create('test', {engine = engine})
+i = s:create_index('pk')
+s:replace{1, {{1, 1}}}
+s:replace{2, {{2, 3}}}
+i2 = s:create_index('sk', {parts = {{2, 'unsigned', path = '[1][*]'}}})
+i2:select()
+s:drop()
-- 
2.21.0

  parent reply	other threads:[~2019-05-06 11:57 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-06 11:57 [PATCH v5 0/4] " Kirill Shcherbatov
2019-05-06 11:57 ` [PATCH v5 1/4] box: introduce tuple_format_iterator class Kirill Shcherbatov
2019-05-06 13:55   ` Vladimir Davydov
2019-05-06 14:32     ` [tarantool-patches] " Kirill Shcherbatov
2019-05-06 11:57 ` [PATCH v5 2/4] box: introduce field_map_builder class Kirill Shcherbatov
2019-05-06 14:22   ` Vladimir Davydov
2019-05-06 11:57 ` [PATCH v5 3/4] salad: introduce bps_tree_delete_identical routine Kirill Shcherbatov
2019-05-06 14:34   ` Vladimir Davydov
2019-05-06 14:55     ` [tarantool-patches] " Kirill Shcherbatov
2019-05-06 11:57 ` Kirill Shcherbatov [this message]
2019-05-06 15:46   ` [PATCH v5 4/4] box: introduce multikey indexes in memtx Vladimir Davydov
2019-05-06 16:35     ` [tarantool-patches] " Kirill Shcherbatov
2019-05-07  8:11       ` Vladimir Davydov
2019-05-07  8:28         ` Kirill Shcherbatov
2019-05-07 11:30           ` Vladimir Davydov
2019-05-07 13:13     ` Vladimir Davydov
2019-05-06 15:52 ` [PATCH v5 0/4] " Vladimir Davydov

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