[Tarantool-patches] [PATCH v1 2/5] box: introduce _vsql_settings sysview

[imeevma@tarantool.org]

This patch creates the _vsql_settings sysview. This system view
has custom methods get() and create_iterator(). This allows us
to get SQL settings by creating a tuple on the fly without having
to save it anywhere.

Part of #4511

@TarantoolBot document
Title: The _vsql_settings sysview
Sysview _vsql_settings allows the user to get the current SQL
parameters.

Currently available SQL settings:
'defer_foreign_keys'
'full_column_names'
'recursive_triggers'
'reverse_unordered_selects'
'sql_compound_select_limit'
'sql_default_engine'

In addition, SQL debugging settings can also be obtained from this
system view in the debug build:
'parser_trace'
'select_trace'
'sql_trace'
'vdbe_addoptrace'
'vdbe_debug'
'vdbe_eqp'
'vdbe_listing'
'vdbe_trace'
'where_trace'

Example of usage:
box.space._vsql_settings:get{'full_column_names'}
box.space._vsql_settings:select{'defer_foreign_keys'}
box.space._vsql_settings:select{'full_column_names', {iterator = 'LE'}}
---
 src/box/bootstrap.snap             | Bin 5934 -> 5973 bytes
 src/box/lua/space.cc               |   2 +
 src/box/lua/upgrade.lua            |  23 +++++
 src/box/schema_def.h               |   2 +
 src/box/sql.c                      | 203 +++++++++++++++++++++++++++++++++++++
 src/box/sql.h                      |  66 ++++++++++++
 src/box/sql/sqlInt.h               |  14 +--
 src/box/sysview.c                  |  19 +++-
 test/app-tap/tarantoolctl.test.lua |   4 +-
 test/box-py/bootstrap.result       |   5 +-
 test/box/access_misc.result        | 136 +++++++++++++------------
 test/box/access_sysview.result     |   6 +-
 test/box/alter.result              |   5 +-
 test/box/sql.result                | 111 ++++++++++++++++++++
 test/box/sql.test.lua              |  38 +++++++
 test/wal_off/alter.result          |   2 +-
 16 files changed, 542 insertions(+), 94 deletions(-)

diff --git a/src/box/bootstrap.snap b/src/box/bootstrap.snap
index 4c9aea7f50f8ac86be32ca9f126fea9a3d2d182f..3657cffeae14a0fb1875743c31775c7adba5413e 100644

diff --git a/src/box/lua/space.cc b/src/box/lua/space.cc
index d0a7e78..1de2567 100644
--- a/src/box/lua/space.cc
+++ b/src/box/lua/space.cc
@@ -649,6 +649,8 @@ box_lua_space_init(struct lua_State *L)
 	lua_setfield(L, -2, "SPACE_SEQUENCE_ID");
 	lua_pushnumber(L, BOX_FUNC_INDEX_ID);
 	lua_setfield(L, -2, "FUNC_INDEX_ID");
+	lua_pushnumber(L, BOX_VSQL_SETTINGS_ID);
+	lua_setfield(L, -2, "VSQL_SETTINGS_ID");
 	lua_pushnumber(L, BOX_SYSTEM_ID_MIN);
 	lua_setfield(L, -2, "SYSTEM_ID_MIN");
 	lua_pushnumber(L, BOX_SYSTEM_ID_MAX);
diff --git a/src/box/lua/upgrade.lua b/src/box/lua/upgrade.lua
index 2abd75d..f105db8 100644
--- a/src/box/lua/upgrade.lua
+++ b/src/box/lua/upgrade.lua
@@ -930,6 +930,28 @@ local function upgrade_to_2_3_0()
 end
 
 --------------------------------------------------------------------------------
+-- Tarantool 2.3.1
+--------------------------------------------------------------------------------
+
+local function create_vsql_settings_sysview()
+    local _space = box.space[box.schema.SPACE_ID]
+    local _index = box.space[box.schema.INDEX_ID]
+    local format = {}
+    format[1] = {name='name', type='string'}
+    format[2] = {name='value', type='any'}
+    log.info("create space _vsql_settings")
+    _space:insert{box.schema.VSQL_SETTINGS_ID, ADMIN, '_vsql_settings',
+                  'sysview', 0, setmap({}), format}
+    log.info("create index _sql_settings:primary")
+    _index:insert{box.schema.VSQL_SETTINGS_ID, 0, 'primary', 'tree',
+                  {unique = true}, {{0, 'string'}}}
+end
+
+local function upgrade_to_2_3_1()
+    create_vsql_settings_sysview()
+end
+
+--------------------------------------------------------------------------------
 
 local function get_version()
     local version = box.space._schema:get{'version'}
@@ -964,6 +986,7 @@ local function upgrade(options)
         {version = mkversion(2, 1, 3), func = upgrade_to_2_1_3, auto = true},
         {version = mkversion(2, 2, 1), func = upgrade_to_2_2_1, auto = true},
         {version = mkversion(2, 3, 0), func = upgrade_to_2_3_0, auto = true},
+        {version = mkversion(2, 3, 1), func = upgrade_to_2_3_1, auto = true},
     }
 
     for _, handler in ipairs(handlers) do
diff --git a/src/box/schema_def.h b/src/box/schema_def.h
index 85f652d..04e1e33 100644
--- a/src/box/schema_def.h
+++ b/src/box/schema_def.h
@@ -114,6 +114,8 @@ enum {
 	BOX_CK_CONSTRAINT_ID = 364,
 	/** Space id of _func_index. */
 	BOX_FUNC_INDEX_ID = 372,
+	/** Space id of _vsql_settings. */
+	BOX_VSQL_SETTINGS_ID = 380,
 	/** End of the reserved range of system spaces. */
 	BOX_SYSTEM_ID_MAX = 511,
 	BOX_ID_NIL = 2147483647
diff --git a/src/box/sql.c b/src/box/sql.c
index f1df555..0c73caf 100644
--- a/src/box/sql.c
+++ b/src/box/sql.c
@@ -1265,3 +1265,206 @@ vdbe_field_ref_prepare_tuple(struct vdbe_field_ref *field_ref,
 	vdbe_field_ref_create(field_ref, tuple, tuple_data(tuple),
 			      tuple->bsize);
 }
+
+struct sql_option_metadata sql_options[] = {
+	/* SQL_OPTION_DEFER_FOREIGN_KEYS */
+	{"defer_foreign_keys", FIELD_TYPE_BOOLEAN, SQL_DeferFKs},
+	/* SQL_OPTION_DEFER_FOREIGN_KEYS */
+	{"full_column_names", FIELD_TYPE_BOOLEAN, SQL_FullColNames},
+	/* SQL_OPTION_RECURSIVE_TRIGGERS */
+	{"recursive_triggers", FIELD_TYPE_BOOLEAN, SQL_RecTriggers},
+	/* SQL_OPTION_REVERSE_UNORDERED_SELECTS */
+	{"reverse_unordered_selects", FIELD_TYPE_BOOLEAN, SQL_ReverseOrder},
+	/* SQL_OPTION_COMPOUND_SELECT_LIMIT */
+	{"sql_compound_select_limit", FIELD_TYPE_INTEGER, 0},
+	/* SQL_OPTION_DEFAULT_ENGINE */
+	{"sql_default_engine", FIELD_TYPE_STRING, 0},
+	/* SQL_OPTION_PARSER_TRACE */
+	{"parser_trace", FIELD_TYPE_BOOLEAN, PARSER_TRACE_FLAG},
+	/* SQL_OPTION_SELECT_TRACE */
+	{"select_trace", FIELD_TYPE_BOOLEAN, SQL_SelectTrace},
+	/* SQL_OPTION_TRACE */
+	{"sql_trace", FIELD_TYPE_BOOLEAN, SQL_SqlTrace},
+	/* SQL_OPTION_VDBE_ADDOPTRACE */
+	{"vdbe_addoptrace", FIELD_TYPE_BOOLEAN, SQL_VdbeAddopTrace},
+	/* SQL_OPTION_VDBE_DEBUG */
+	{"vdbe_debug", FIELD_TYPE_BOOLEAN,
+	 SQL_SqlTrace | SQL_VdbeListing | SQL_VdbeTrace},
+	/* SQL_OPTION_VDBE_EQP */
+	{"vdbe_eqp", FIELD_TYPE_BOOLEAN, SQL_VdbeEQP},
+	/* SQL_OPTION_VDBE_LISTING */
+	{"vdbe_listing", FIELD_TYPE_BOOLEAN, SQL_VdbeListing},
+	/* SQL_OPTION_VDBE_TRACE */
+	{"vdbe_trace", FIELD_TYPE_BOOLEAN, SQL_VdbeTrace},
+	/* SQL_OPTION_WHERE_TRACE */
+	{"where_trace", FIELD_TYPE_BOOLEAN, SQL_WhereTrace},
+};
+
+static inline int
+sql_option_id_by_key(const char *key)
+{
+	uint32_t len;
+	struct region *region = &fiber()->gc;
+	size_t svp = region_used(region);
+	const char *tmp = mp_decode_str(&key, &len);
+	char *str = region_alloc(region, len + 1);
+	strncpy(str, tmp, len);
+	str[len] = '\0';
+	int id;
+	for (id = 0; id < SQL_OPTION_max; ++id) {
+		if (strcmp(str, sql_options[id].name) == 0)
+			break;
+	}
+	region_truncate(region, svp);
+	return id;
+}
+
+/**
+ * Create tuple that contains name and value of the option.
+ *
+ * @param format format for new tuple.
+ * @param option_id id of option to return.
+ * @param result[out] new tuple.
+ */
+static int
+sql_option_tuple(struct tuple_format *format, int option_id,
+		 struct tuple **result)
+{
+	if (option_id < 0 || option_id >= SQL_OPTION_max) {
+		*result = NULL;
+		return 0;
+	}
+	int limit = 0;
+	const char *engine = NULL;
+	struct region *region = &fiber()->gc;
+	struct session *session = current_session();
+	uint32_t flags = session->sql_flags;
+	uint32_t option_flag = sql_options[option_id].flag;
+	/* Change to format->*_field_count */
+	uint32_t column_count = 2;
+	size_t size = mp_sizeof_array(column_count) +
+		      mp_sizeof_str(strlen(sql_options[option_id].name));
+	if (sql_options[option_id].field_type == FIELD_TYPE_BOOLEAN) {
+		size += mp_sizeof_bool(true);
+	} else if (option_id == SQL_OPTION_DEFAULT_ENGINE) {
+		engine = sql_storage_engine_strs[session->sql_default_engine];
+		size += mp_sizeof_str(strlen(engine));
+	} else {
+		assert(option_id == SQL_OPTION_COMPOUND_SELECT_LIMIT);
+		limit = sql_get()->aLimit[SQL_LIMIT_COMPOUND_SELECT];
+		size += mp_sizeof_uint(limit);
+	}
+
+	size_t svp = region_used(region);
+	char *pos_ret = region_alloc(region, size);
+	if (pos_ret == NULL) {
+		diag_set(OutOfMemory, size, "region_alloc", "pos_ret");
+		return -1;
+	}
+	char *pos = mp_encode_array(pos_ret, column_count);
+	pos = mp_encode_str(pos, sql_options[option_id].name,
+			    strlen(sql_options[option_id].name));
+	if (sql_options[option_id].field_type == FIELD_TYPE_BOOLEAN)
+		pos = mp_encode_bool(pos, (flags & option_flag) == option_flag);
+	else if (option_id == SQL_OPTION_DEFAULT_ENGINE)
+		pos = mp_encode_str(pos, engine, strlen(engine));
+	else
+		pos = mp_encode_uint(pos, limit);
+	struct tuple *tuple = tuple_new(format, pos_ret, pos_ret + size);
+	region_truncate(region, svp);
+	if (tuple == NULL)
+		return -1;
+	*result = tuple;
+	return 0;
+}
+
+int
+sql_options_get(struct index *index, const char *key, uint32_t part_count,
+		struct tuple **result)
+{
+	assert(part_count == 1);
+	(void)part_count;
+	struct space *space = space_cache_find(index->def->space_id);
+	uint32_t option_id = sql_option_id_by_key(key);
+	if (option_id == SQL_OPTION_max) {
+		*result = NULL;
+		return 0;
+	}
+	return sql_option_tuple(space->format, option_id, result);
+}
+
+struct sql_options_iterator {
+	struct iterator base;
+	struct tuple_format *format;
+	int option_id;
+	bool is_eq_type;
+	size_t svp;
+};
+
+static int
+sql_options_iterator_next(struct iterator *itr, struct tuple **ret)
+{
+	struct sql_options_iterator *it = (struct sql_options_iterator *)itr;
+	int rc = sql_option_tuple(it->format, it->option_id++, ret);
+	if (it->is_eq_type)
+		it->option_id = SQL_OPTION_max;
+	return rc;
+}
+
+static int
+sql_options_iterator_prev(struct iterator *itr, struct tuple **ret)
+{
+	struct sql_options_iterator *it = (struct sql_options_iterator *)itr;
+	int rc = sql_option_tuple(it->format, it->option_id--, ret);
+	if (it->is_eq_type)
+		it->option_id = -1;
+	return rc;
+}
+
+static void
+sql_options_iterator_free(struct iterator *itr)
+{
+	struct sql_options_iterator *it = (struct sql_options_iterator *)itr;
+	region_truncate(&fiber()->gc, it->svp);
+}
+
+struct iterator *
+sql_options_create_iterator(struct index *index, enum iterator_type type,
+			    const char *key, uint32_t part_count)
+{
+	bool is_eq_type = false;
+	uint32_t option_id;
+	if (part_count > 0) {
+		assert(part_count == 1);
+		option_id = sql_option_id_by_key(key);
+		if (type == ITER_EQ || type == ITER_REQ)
+			is_eq_type = true;
+		else if (type == ITER_LT)
+			--option_id;
+		else if (type == ITER_GT)
+			++option_id;
+		if (option_id == SQL_OPTION_max && type == ITER_LE)
+			--option_id;
+	} else {
+		option_id = iterator_type_is_reverse(type) ?
+			    SQL_OPTION_max - 1 : 0;
+	}
+	struct space *space = space_cache_find(index->def->space_id);
+	struct region *region = &fiber()->gc;
+	size_t svp = region_used(region);
+	struct sql_options_iterator *it = region_alloc(region, sizeof(*it));
+	if (it == NULL) {
+		diag_set(OutOfMemory, sizeof(*it), "region_alloc", "it");
+		return NULL;
+	}
+	iterator_create(&it->base, index);
+	it->base.next = iterator_type_is_reverse(type) ?
+			sql_options_iterator_prev :
+			sql_options_iterator_next;
+	it->base.free = sql_options_iterator_free;
+	it->option_id = option_id;
+	it->is_eq_type = is_eq_type;
+	it->format = space->format;
+	it->svp = svp;
+	return (struct iterator *)it;
+}
diff --git a/src/box/sql.h b/src/box/sql.h
index 0fa52fc..5c23748 100644
--- a/src/box/sql.h
+++ b/src/box/sql.h
@@ -33,11 +33,68 @@
 
 #include <stdbool.h>
 #include <stdint.h>
+#include "iterator_type.h"
 
 #if defined(__cplusplus)
 extern "C" {
 #endif
 
+/** SQL options flags. */
+/** True to trace VDBE execution */
+#define SQL_VdbeTrace		0x00000001
+/** Debug print info about SQL query as it parsed */
+#define PARSER_TRACE_FLAG	0x00000002
+/** Show full column names on SELECT */
+#define SQL_FullColNames	0x00000004
+/** Debug print SQL as it executes */
+#define SQL_SqlTrace		0x00000200
+/** Debug info about select statement */
+#define SQL_SelectTrace		0x00000800
+/** Debug info about optimizer's work */
+#define SQL_WhereTrace		0x00008000
+/** Debug listings of VDBE programs */
+#define SQL_VdbeListing		0x00000400
+/** Trace sqlVdbeAddOp() calls */
+#define SQL_VdbeAddopTrace	0x00001000
+/** Reverse unordered SELECTs */
+#define SQL_ReverseOrder	0x00020000
+/** Enable recursive triggers */
+#define SQL_RecTriggers		0x00040000
+/** Defer all FK constraints */
+#define SQL_DeferFKs		0x02000000
+/** Debug EXPLAIN QUERY PLAN */
+#define SQL_VdbeEQP		0x08000000
+
+enum {
+	SQL_OPTION_DEFER_FOREIGN_KEYS = 0,
+	SQL_OPTION_FULL_COLUMN_NAMES,
+	SQL_OPTION_RECURSIVE_TRIGGERS,
+	SQL_OPTION_REVERSE_UNORDERED_SELECTS,
+	SQL_OPTION_COMPOUND_SELECT_LIMIT,
+	SQL_OPTION_DEFAULT_ENGINE,
+#ifndef NDEBUG
+	SQL_OPTION_PARSER_TRACE,
+	SQL_OPTION_SELECT_TRACE,
+	SQL_OPTION_TRACE,
+	SQL_OPTION_VDBE_ADDOPTRACE,
+	SQL_OPTION_VDBE_DEBUG,
+	SQL_OPTION_VDBE_EQP,
+	SQL_OPTION_VDBE_LISTING,
+	SQL_OPTION_VDBE_TRACE,
+	SQL_OPTION_WHERE_TRACE,
+#endif
+	SQL_OPTION_max,
+};
+
+struct sql_option_metadata
+{
+	const char *name;
+	uint32_t field_type;
+	uint32_t flag;
+};
+
+extern struct sql_option_metadata sql_options[];
+
 void
 sql_init();
 
@@ -70,6 +127,7 @@ struct Select;
 struct Table;
 struct sql_trigger;
 struct space_def;
+struct index;
 
 /**
  * Perform parsing of provided expression. This is done by
@@ -420,6 +478,14 @@ void
 vdbe_field_ref_prepare_tuple(struct vdbe_field_ref *field_ref,
 			     struct tuple *tuple);
 
+int
+sql_options_get(struct index *index, const char *key, uint32_t part_count,
+		struct tuple **result);
+
+struct iterator *
+sql_options_create_iterator(struct index *index, enum iterator_type type,
+			    const char *key, uint32_t part_count);
+
 #if defined(__cplusplus)
 } /* extern "C" { */
 #endif
diff --git a/src/box/sql/sqlInt.h b/src/box/sql/sqlInt.h
index 1b6d92c..a87590e 100644
--- a/src/box/sql/sqlInt.h
+++ b/src/box/sql/sqlInt.h
@@ -1153,25 +1153,13 @@ struct sql {
 /*
  * Possible values for the sql.flags.
  */
-#define SQL_VdbeTrace      0x00000001	/* True to trace VDBE execution */
-/* Debug print info about SQL query as it parsed */
-#define PARSER_TRACE_FLAG  0x00000002
-#define SQL_FullColNames   0x00000004	/* Show full column names on SELECT */
+
 #define SQL_ShortColNames  0x00000040	/* Show short columns names */
 #define SQL_CountRows      0x00000080	/* Count rows changed by INSERT, */
 					  /*   DELETE, or UPDATE and return */
 					  /*   the count using a callback. */
-#define SQL_SqlTrace       0x00000200	/* Debug print SQL as it executes */
-#define SQL_SelectTrace    0x00000800       /* Debug info about select statement */
-#define SQL_WhereTrace     0x00008000       /* Debug info about optimizer's work */
-#define SQL_VdbeListing    0x00000400	/* Debug listings of VDBE programs */
-#define SQL_VdbeAddopTrace 0x00001000	/* Trace sqlVdbeAddOp() calls */
-#define SQL_ReverseOrder   0x00020000	/* Reverse unordered SELECTs */
-#define SQL_RecTriggers    0x00040000	/* Enable recursive triggers */
 #define SQL_AutoIndex      0x00100000	/* Enable automatic indexes */
 #define SQL_EnableTrigger  0x01000000	/* True to enable triggers */
-#define SQL_DeferFKs       0x02000000	/* Defer all FK constraints */
-#define SQL_VdbeEQP        0x08000000	/* Debug EXPLAIN QUERY PLAN */
 
 /* Bits of the sql.dbOptFlags field. */
 #define SQL_QueryFlattener 0x0001	/* Query flattening */
diff --git a/src/box/sysview.c b/src/box/sysview.c
index 745cf09..76d58b0 100644
--- a/src/box/sysview.c
+++ b/src/box/sysview.c
@@ -36,6 +36,7 @@
 #include <stdlib.h>
 #include <small/mempool.h>
 
+#include "sql.h"
 #include "diag.h"
 #include "error.h"
 #include "errcode.h"
@@ -411,7 +412,7 @@ vsequence_filter(struct space *source, struct tuple *tuple)
 }
 
 static bool
-vcollation_filter(struct space *source, struct tuple *tuple)
+generic_filter(struct space *source, struct tuple *tuple)
 {
 	(void) source;
 	(void) tuple;
@@ -481,10 +482,17 @@ sysview_space_create_index(struct space *space, struct index_def *def)
 	case BOX_VCOLLATION_ID:
 		source_space_id = BOX_COLLATION_ID;
 		source_index_id = def->iid;
-		filter = vcollation_filter;
+		filter = generic_filter;
 		get = index_get;
 		create_iterator = index_create_iterator;
 		break;
+	case BOX_VSQL_SETTINGS_ID:
+		source_space_id = BOX_VSQL_SETTINGS_ID;
+		source_index_id = def->iid;
+		filter = generic_filter;
+		get = sql_options_get;
+		create_iterator = sql_options_create_iterator;
+		break;
 	default:
 		diag_set(ClientError, ER_MODIFY_INDEX,
 			 def->name, space_name(space),
@@ -569,9 +577,10 @@ sysview_engine_create_space(struct engine *engine, struct space_def *def,
 		return NULL;
 	}
 	struct tuple_format *format =
-		tuple_format_new(NULL, NULL, keys, key_count, def->fields,
-				 def->field_count, def->exact_field_count,
-				 def->dict, def->opts.is_temporary,
+		tuple_format_new(&tuple_format_runtime->vtab, NULL, keys,
+				 key_count, def->fields, def->field_count,
+				 def->exact_field_count, def->dict,
+				 def->opts.is_temporary,
 				 def->opts.is_ephemeral);
 	if (format == NULL) {
 		free(space);
diff --git a/test/app-tap/tarantoolctl.test.lua b/test/app-tap/tarantoolctl.test.lua
index f388208..a41fad3 100755
--- a/test/app-tap/tarantoolctl.test.lua
+++ b/test/app-tap/tarantoolctl.test.lua
@@ -410,8 +410,8 @@ do
             check_ctlcat_xlog(test_i, dir, "--from=3 --to=6 --format=json --show-system --replica 1", "\n", 3)
             check_ctlcat_xlog(test_i, dir, "--from=3 --to=6 --format=json --show-system --replica 1 --replica 2", "\n", 3)
             check_ctlcat_xlog(test_i, dir, "--from=3 --to=6 --format=json --show-system --replica 2", "\n", 0)
-            check_ctlcat_snap(test_i, dir, "--space=280", "---\n", 24)
-            check_ctlcat_snap(test_i, dir, "--space=288", "---\n", 52)
+            check_ctlcat_snap(test_i, dir, "--space=280", "---\n", 25)
+            check_ctlcat_snap(test_i, dir, "--space=288", "---\n", 53)
         end)
     end)
 
diff --git a/test/box-py/bootstrap.result b/test/box-py/bootstrap.result
index a59979e..f0f7fd7 100644
--- a/test/box-py/bootstrap.result
+++ b/test/box-py/bootstrap.result
@@ -4,7 +4,7 @@ box.internal.bootstrap()
 box.space._schema:select{}
 ---
 - - ['max_id', 511]
-  - ['version', 2, 3, 0]
+  - ['version', 2, 3, 1]
 ...
 box.space._cluster:select{}
 ---
@@ -95,6 +95,8 @@ box.space._space:select{}
       {'name': 'language', 'type': 'str'}, {'name': 'code', 'type': 'str'}]]
   - [372, 1, '_func_index', 'memtx', 0, {}, [{'name': 'space_id', 'type': 'unsigned'},
       {'name': 'index_id', 'type': 'unsigned'}, {'name': 'func_id', 'type': 'unsigned'}]]
+  - [380, 1, '_vsql_settings', 'sysview', 0, {}, [{'name': 'name', 'type': 'string'},
+      {'name': 'value', 'type': 'any'}]]
 ...
 box.space._index:select{}
 ---
@@ -152,6 +154,7 @@ box.space._index:select{}
   - [364, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned'], [1, 'string']]]
   - [372, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned'], [1, 'unsigned']]]
   - [372, 1, 'fid', 'tree', {'unique': false}, [[2, 'unsigned']]]
+  - [380, 0, 'primary', 'tree', {'unique': true}, [[0, 'string']]]
 ...
 box.space._user:select{}
 ---
diff --git a/test/box/access_misc.result b/test/box/access_misc.result
index a1b6435..66469e1 100644
--- a/test/box/access_misc.result
+++ b/test/box/access_misc.result
@@ -835,144 +835,146 @@ box.space._space:select()
       {'name': 'language', 'type': 'str'}, {'name': 'code', 'type': 'str'}]]
   - [372, 1, '_func_index', 'memtx', 0, {}, [{'name': 'space_id', 'type': 'unsigned'},
       {'name': 'index_id', 'type': 'unsigned'}, {'name': 'func_id', 'type': 'unsigned'}]]
+  - [380, 1, '_vsql_settings', 'sysview', 0, {}, [{'name': 'name', 'type': 'string'},
+      {'name': 'value', 'type': 'any'}]]
 ...
 box.space._func:select()
 ---
 - - [1, 1, 'box.schema.user.info', 1, 'LUA', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, ['LUA'], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, ['LUA'], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [2, 1, 'TRIM', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [3, 1, 'TYPEOF', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [4, 1, 'PRINTF', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [5, 1, 'UNICODE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [6, 1, 'CHAR', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [7, 1, 'HEX', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [8, 1, 'VERSION', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [9, 1, 'QUOTE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [10, 1, 'REPLACE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [11, 1, 'SUBSTR', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [12, 1, 'GROUP_CONCAT', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [13, 1, 'JULIANDAY', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [14, 1, 'DATE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [15, 1, 'TIME', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [16, 1, 'DATETIME', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [17, 1, 'STRFTIME', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [18, 1, 'CURRENT_TIME', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [19, 1, 'CURRENT_TIMESTAMP', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none',
-    'none', false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    'none', false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [20, 1, 'CURRENT_DATE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [21, 1, 'LENGTH', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [22, 1, 'POSITION', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [23, 1, 'ROUND', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [24, 1, 'UPPER', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [25, 1, 'LOWER', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [26, 1, 'IFNULL', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [27, 1, 'RANDOM', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [28, 1, 'CEIL', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [29, 1, 'CEILING', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [30, 1, 'CHARACTER_LENGTH', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none',
-    'none', false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    'none', false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [31, 1, 'CHAR_LENGTH', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [32, 1, 'FLOOR', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [33, 1, 'MOD', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [34, 1, 'OCTET_LENGTH', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [35, 1, 'ROW_COUNT', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [36, 1, 'COUNT', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [37, 1, 'LIKE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [38, 1, 'ABS', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [39, 1, 'EXP', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [40, 1, 'LN', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [41, 1, 'POWER', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [42, 1, 'SQRT', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [43, 1, 'SUM', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [44, 1, 'TOTAL', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [45, 1, 'AVG', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [46, 1, 'RANDOMBLOB', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [47, 1, 'NULLIF', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [48, 1, 'ZEROBLOB', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [49, 1, 'MIN', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [50, 1, 'MAX', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [51, 1, 'COALESCE', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [52, 1, 'EVERY', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [53, 1, 'EXISTS', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [54, 1, 'EXTRACT', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [55, 1, 'SOME', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none', false,
-    false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [56, 1, 'GREATER', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [57, 1, 'LESSER', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [58, 1, 'SOUNDEX', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [59, 1, 'LIKELIHOOD', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [60, 1, 'LIKELY', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [61, 1, 'UNLIKELY', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [62, 1, '_sql_stat_get', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none',
-    'none', false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    'none', false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [63, 1, '_sql_stat_push', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none',
-    'none', false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    'none', false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [64, 1, '_sql_stat_init', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none',
-    'none', false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    'none', false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [65, 1, 'LUA', 1, 'LUA', 'function(code) return assert(loadstring(code))() end',
     'function', ['string'], 'any', 'none', 'none', false, false, true, ['LUA', 'SQL'],
-    {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [66, 1, 'GREATEST', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
   - [67, 1, 'LEAST', 1, 'SQL_BUILTIN', '', 'function', [], 'any', 'none', 'none',
-    false, false, true, [], {}, '', '2019-08-14 14:09:37', '2019-08-14 14:09:37']
+    false, false, true, [], {}, '', '2019-10-16 15:38:07', '2019-10-16 15:38:07']
 ...
 session = nil
 ---
diff --git a/test/box/access_sysview.result b/test/box/access_sysview.result
index 3072b73..5a41526 100644
--- a/test/box/access_sysview.result
+++ b/test/box/access_sysview.result
@@ -246,11 +246,11 @@ box.session.su('guest')
 ...
 #box.space._vspace:select{}
 ---
-- 25
+- 26
 ...
 #box.space._vindex:select{}
 ---
-- 53
+- 54
 ...
 #box.space._vuser:select{}
 ---
@@ -282,7 +282,7 @@ box.session.su('guest')
 ...
 #box.space._vindex:select{}
 ---
-- 53
+- 54
 ...
 #box.space._vuser:select{}
 ---
diff --git a/test/box/alter.result b/test/box/alter.result
index 46ce868..8dcb79f 100644
--- a/test/box/alter.result
+++ b/test/box/alter.result
@@ -92,7 +92,7 @@ space = box.space[t[1]]
 ...
 space.id
 ---
-- 373
+- 381
 ...
 space.field_count
 ---
@@ -137,7 +137,7 @@ space_deleted
 ...
 space:replace{0}
 ---
-- error: Space '373' does not exist
+- error: Space '381' does not exist
 ...
 _index:insert{_space.id, 0, 'primary', 'tree', {unique=true}, {{0, 'unsigned'}}}
 ---
@@ -220,6 +220,7 @@ _index:select{}
   - [364, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned'], [1, 'string']]]
   - [372, 0, 'primary', 'tree', {'unique': true}, [[0, 'unsigned'], [1, 'unsigned']]]
   - [372, 1, 'fid', 'tree', {'unique': false}, [[2, 'unsigned']]]
+  - [380, 0, 'primary', 'tree', {'unique': true}, [[0, 'string']]]
 ...
 -- modify indexes of a system space
 _index:delete{_index.id, 0}
diff --git a/test/box/sql.result b/test/box/sql.result
index 78dc471..66b2e57 100644
--- a/test/box/sql.result
+++ b/test/box/sql.result
@@ -849,3 +849,114 @@ box.schema.user.drop('test')
 s:drop()
 ---
 ...
+--
+-- gh-4511: make sure that _vsql_settings sysview works as
+-- intended.
+--
+v = box.space._vsql_settings
+---
+...
+option_count = v:count()
+---
+...
+v:format()
+---
+- [{'name': 'name', 'type': 'string'}, {'name': 'value', 'type': 'any'}]
+...
+(#v:select()) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'ALL'})) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'REQ'})) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'EQ'})) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'GE'})) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'GT'})) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'LE'})) == option_count
+---
+- true
+...
+(#v:select({}, {iterator = 'LT'})) == option_count
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'ALL'})) == 0
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'REQ'})) == 0
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'EQ'})) == 0
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'GE'})) == 0
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'GT'})) == 0
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'LE'})) == option_count
+---
+- true
+...
+(#v:select({'abcde'}, {iterator = 'LT'})) == option_count
+---
+- true
+...
+v:select({'defer_foreign_keys'})
+---
+- - ['defer_foreign_keys', false]
+...
+v:select({'recursive_triggers'})
+---
+- - ['recursive_triggers', true]
+...
+v:select({'reverse_unordered_selects'})
+---
+- - ['reverse_unordered_selects', false]
+...
+v:select({'sql_compound_select_limit'})
+---
+- - ['sql_compound_select_limit', 30]
+...
+v:select({'sql_default_engine'})
+---
+- - ['sql_default_engine', 'memtx']
+...
+new_record = v:frommap({name='abs', value=123})
+---
+...
+v:insert(new_record)
+---
+- error: View '_vsql_settings' is read-only
+...
+box.execute([[SELECT * from "_vsql_settings" WHERE "name" = 'sql_default_engine']])
+---
+- metadata:
+  - name: name
+    type: string
+  - name: value
+    type: any
+  rows:
+  - ['sql_default_engine', 'memtx']
+...
diff --git a/test/box/sql.test.lua b/test/box/sql.test.lua
index 3d2a99b..56daab0 100644
--- a/test/box/sql.test.lua
+++ b/test/box/sql.test.lua
@@ -305,3 +305,41 @@ space:delete(3)
 
 box.schema.user.drop('test')
 s:drop()
+
+--
+-- gh-4511: make sure that _vsql_settings sysview works as
+-- intended.
+--
+
+v = box.space._vsql_settings
+option_count = v:count()
+
+v:format()
+
+(#v:select()) == option_count
+(#v:select({}, {iterator = 'ALL'})) == option_count
+(#v:select({}, {iterator = 'REQ'})) == option_count
+(#v:select({}, {iterator = 'EQ'})) == option_count
+(#v:select({}, {iterator = 'GE'})) == option_count
+(#v:select({}, {iterator = 'GT'})) == option_count
+(#v:select({}, {iterator = 'LE'})) == option_count
+(#v:select({}, {iterator = 'LT'})) == option_count
+
+(#v:select({'abcde'}, {iterator = 'ALL'})) == 0
+(#v:select({'abcde'}, {iterator = 'REQ'})) == 0
+(#v:select({'abcde'}, {iterator = 'EQ'})) == 0
+(#v:select({'abcde'}, {iterator = 'GE'})) == 0
+(#v:select({'abcde'}, {iterator = 'GT'})) == 0
+(#v:select({'abcde'}, {iterator = 'LE'})) == option_count
+(#v:select({'abcde'}, {iterator = 'LT'})) == option_count
+
+v:select({'defer_foreign_keys'})
+v:select({'recursive_triggers'})
+v:select({'reverse_unordered_selects'})
+v:select({'sql_compound_select_limit'})
+v:select({'sql_default_engine'})
+
+new_record = v:frommap({name='abs', value=123})
+v:insert(new_record)
+
+box.execute([[SELECT * from "_vsql_settings" WHERE "name" = 'sql_default_engine']])
diff --git a/test/wal_off/alter.result b/test/wal_off/alter.result
index 62cb11d..97f7e6f 100644
--- a/test/wal_off/alter.result
+++ b/test/wal_off/alter.result
@@ -28,7 +28,7 @@ end;
 ...
 #spaces;
 ---
-- 65502
+- 65501
 ...
 -- cleanup
 for k, v in pairs(spaces) do
-- 
2.7.4