[tarantool-patches] Re: [PATCH v3] sql: add index_def to struct Index

Ivan Koptelov ivan.koptelov at tarantool.org
Wed Jun 13 10:30:23 MSK 2018



> 1. Please, do not paste SMTP headers in the body.
> 
> 2. Looks like in the diff below all tabs are turned into 4 spaces. Please
> cope with it. Maybe, your IDE made it.

> > 
> > Now every sqlite struct Index is created with tnt struct
> > index_def inside. This allows us to use tnt index_def
> > in work with sqlite indexes in the same manner as with
> > tnt index and is a step to remove sqlite Index with
> > tnt index.
> > Fields coll_array, coll_id_array, aiColumn, sort_order
> > and zName are removed from Index. All usages of this
> > fields changed to usage of corresponding index_def
> > fields.
> > index_is_unique(), sql_index_collation() and
> > index_column_count() are removed with calls of
> > index_def corresponding fields.
> > 
> > Closes: #3369
> > Github branch: https://github.com/tarantool/tarantool/tree/sb/gh-3369-use-index-def-in-select-and-where <https://github.com/tarantool/tarantool/tree/sb/gh-3369-use-index-def-in-select-and-where>
> 
> 3. Please, put branch link below ---.
> 
> > ---
> 
> Here. And do not forget about link to the issue.
> 
>      Branch: <link>
>      Issue: <link>
> 
> > src/box/sql.c | 18 +--
> > src/box/sql/analyze.c | 24 +--
> > src/box/sql/build.c | 398 ++++++++++++++++++++++++------------------------
> > src/box/sql/delete.c | 16 +-
> > src/box/sql/expr.c | 59 ++++---
> > src/box/sql/fkey.c | 41 +++--
> > src/box/sql/insert.c | 134 +++++++---------
> > src/box/sql/pragma.c | 19 ++-
> > src/box/sql/select.c | 2 +-
> > src/box/sql/sqliteInt.h | 25 +--
> > src/box/sql/trigger.c | 2 -
> > src/box/sql/update.c | 10 +-
> > src/box/sql/vdbemem.c | 2 +-
> > src/box/sql/where.c | 140 ++++++++---------
> > src/box/sql/wherecode.c | 43 +++---
> > src/box/sql/whereexpr.c | 15 --
> > 16 files changed, 433 insertions(+), 515 deletions(-)
> >> diff --git a/src/box/sql/build.c b/src/box/sql/build.c
> > index 28e4d7a4d..74fb66565 100644
> > --- a/src/box/sql/build.c
> > +++ b/src/box/sql/build.c
> > @@ -1072,11 +1075,9 @@ sqlite3AddCollateType(Parse * pParse, Token * pToken)
> > * collation type was added. Correct this if it is the case.
> > */
> > for (pIdx = p->pIndex; pIdx; pIdx = pIdx->pNext) {
> > - assert(pIdx->nColumn == 1);
> > - if (pIdx->aiColumn[0] == i) {
> > - id = &pIdx->coll_id_array[0];
> > - pIdx->coll_array[0] =
> > - sql_column_collation(p->def, i, id);
> > + assert(pIdx->def->key_def->part_count == 1);
> > + if ((int)pIdx->def->key_def->parts[0].fieldno == i) {
> > + id = &pIdx->def->key_def->parts[0].coll_id;
> 
> 4. I have just noticed the zColl leaks here. It is not deleted if
> coll != NULL, but must.
> 
> 5. Here you have removed coll * initialization.
> sql_column_collation function here was used to set coll id and collation,
> by column number. But now this whole cycle does nothing as you can see.
> Please, return this initialization. You sill must init
> key_def->parts[0].coll_id and coll.
> 
> > }
> > }
> > } else {
> > @@ -1123,52 +1124,10 @@ sql_index_key_def(struct Index *idx)
> > enum sort_order
> > sql_index_column_sort_order(Index *idx, uint32_t column)
> 
> 6. Now this function is useless one line wrapper. Please,
> remove it too.
> 
> > {
> > - assert(idx != NULL);
> > - uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->pTable->tnum);
> > - struct space *space = space_by_id(space_id);
> > -
> > - assert(column < idx->nColumn);
> > - /*
> > - * If space is still under construction, or it is
> > - * an ephemeral space, then fetch collation from
> > - * SQL internal structure.
> > - */
> > - if (space == NULL) {
> > - assert(column < idx->nColumn);
> > - return idx->sort_order[column];
> > - }
> > -
> > - struct key_def *key_def = sql_index_key_def(idx);
> > - assert(key_def != NULL && key_def->part_count >= column);
> > - return key_def->parts[column].sort_order;
> > + return idx->def->key_def->parts[column].sort_order;
> > }
> > 
> > /**
> > @@ -1383,14 +1342,16 @@ createTableStmt(sqlite3 * db, Table * p)
> > return zStmt;
> > }
> > 
> > -/* Return true if value x is found any of the first nCol entries of aiCol[]
> > - */
> > static int
> > -hasColumn(const i16 * aiCol, int nCol, int x)
> > +hasColumn(const struct key_part *key_parts, int nCol, const struct key_part key_part)
> 
> 7. Passing a struct by value is very bad idea. Please, don't do it ever.
> And looks like here fieldno is enough.
> 
> > {
> > - while (nCol-- > 0)
> > - if (x == *(aiCol++))
> > + int i = 0;
> > + while (i < nCol) {
> > + if (key_part.fieldno == key_parts->fieldno)
> > return 1;
> > + key_parts++;
> > + i++;
> > + }
> > return 0;
> > }
> > 
> > @@ -1410,13 +1371,13 @@ static void
> > convertToWithoutRowidTable(Parse * pParse, Table * pTab)
> > {
> > Index *pPk;
> > - int i, j;
> > + uint32_t i, j;
> 
> 8. Please, do not predeclare cycle iterators when possible. It is
> SQLite code style, not Tarantool. When you change the SQLite code,
> it must turn into Tarantool style.
> 
> > @@ -1454,14 +1415,17 @@ convertToWithoutRowidTable(Parse * pParse, Table * pTab)
> > * "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)". Later
> > * code assumes the PRIMARY KEY contains no repeated columns.
> > */
> > - for (i = j = 1; i < pPk->nColumn; i++) {
> > - if (hasColumn(pPk->aiColumn, j, pPk->aiColumn[i])) {
> > - pPk->nColumn--;
> > + for (i = j = 1; i < pPk->def->key_def->part_count; i++) {
> > + if (hasColumn(pPk->def->key_def->parts, j,
> > + pPk->def->key_def->parts[i])) {
> > + pPk->def->key_def->part_count--;
> > } else {
> > - pPk->aiColumn[j++] = pPk->aiColumn[i];
> > + pPk->def->key_def->parts[j++] =
> > + pPk->def->key_def->parts[i];
> > }
> 
> 9. Wrong alignments almost on all new lines. And please, save a
> key_def->parts in a separate variable and use it instead of the full
> path pPk->def->key_def->parts. It is too long to be used 4 times on
> 6 lines.
> 
> 10. I see that cycle iterates until pPk->def->key_def->part_count,
> but this variable is decremented inside the cycle. So the last
> columns are not checked. This value must be saved in a separate
> variable before usage as a 'for' guard.
> 
> > }
> > - pPk->nColumn = j;
> > +
> > + pPk->def->key_def->part_count = j;
> 
> 11. This line makes no sense. You have already updated part_count
> inside the cycle. Either you update here, or in the cycle.
> 
> > }
> > assert(pPk != 0);
> > }
> > @@ -2654,8 +2618,9 @@ sqlite3RefillIndex(Parse * pParse, Index * pIndex, int memRootPage)
> > }
> > /* Open the sorter cursor if we are to use one. */
> > iSorter = pParse->nTab++;
> > - sqlite3VdbeAddOp4(v, OP_SorterOpen, iSorter, 0, pIndex->nColumn,
> > - (char *)def, P4_KEYDEF);
> > + sqlite3VdbeAddOp4(v, OP_SorterOpen, iSorter, 0,
> > + pIndex->def->key_def->part_count,
> > + (char *)def, P4_KEYDEF);
> 
> 12. Wrong alignment.
> 
> > 
> > /* Open the table. Loop through all rows of the table, inserting index
> > * records into the sorter.
> > @@ -2687,7 +2652,7 @@ sqlite3RefillIndex(Parse * pParse, Index * pIndex, int memRootPage)
> > sqlite3VdbeGoto(v, j2);
> > addr2 = sqlite3VdbeCurrentAddr(v);
> > sqlite3VdbeAddOp4Int(v, OP_SorterCompare, iSorter, j2,
> > - regRecord, pIndex->nColumn);
> > + regRecord, pIndex->def->key_def->part_count);
> 
> 13. Same.
> 
> > VdbeCoverage(v);
> > sqlite3UniqueConstraint(pParse, ON_CONFLICT_ACTION_ABORT,
> > pIndex);
> > @@ -2733,16 +2698,11 @@ sqlite3AllocateIndexObject(sqlite3 * db, /* Database connection */
> > p = sqlite3DbMallocZero(db, nByte + nExtra);
> > if (p) {
> > char *pExtra = ((char *)p) + ROUND8(sizeof(Index));
> > - p->coll_array = (struct coll **)pExtra;
> 
> 14. I still see coll_array in build.c in comments.
> 
> > pExtra += ROUND8(sizeof(struct coll **) * nCol);
> > - p->coll_id_array = (uint32_t *) pExtra;
> 
> 15. Same.
> 
> > pExtra += ROUND8(sizeof(uint32_t) * nCol);
> > p->aiRowLogEst = (LogEst *) pExtra;
> > pExtra += sizeof(LogEst) * (nCol + 1);
> > - p->aiColumn = (i16 *) pExtra;
> 
> 16. Same. And in very many places.
> 
> > pExtra += sizeof(i16) * nCol;
> > - p->sort_order = (enum sort_order *) pExtra;
> > - p->nColumn = nCol;
> > *ppExtra = ((char *)p) + nByte;
> 
> 17. You have removed the fields, but did not update
> sqlite3AllocateIndexObject that still allocates memory for them.
> 
> > }
> > return p;
> > @@ -2831,18 +2791,119 @@ addIndexToTable(Index * pIndex, Table * pTab)
> > }
> > }
> > 
> > -bool
> > -index_is_unique(Index *idx)
> > +void
> > +append(struct region *r, const char *str, size_t *total_sql_size)
> > {
> > - assert(idx != NULL);
> > - uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->tnum);
> > - uint32_t index_id = SQLITE_PAGENO_TO_INDEXID(idx->tnum);
> > - struct space *space = space_by_id(space_id);
> > - assert(space != NULL);
> > - struct index *tnt_index = space_index(space, index_id);
> > - assert(tnt_index != NULL);
> > + memcpy(region_alloc(r, strlen(str)), str, strlen(str));
> > + *total_sql_size += strlen(str);
> > +}
> 18. Please, rename append function. This name is too common. And
> make it static inline.
> 
> 19. You do not check region_alloc fails.
> 
> > +
> > +char *
> > +create_sql(const char *idx_name, struct space_def *space_def, ExprList *expr_list)
> 
> 20. Same as 18.
> 
> 21. Out of 80 symbols.
> 
> 22. Please, use struct ExprList, not ExprList.
> 
> 23. I still can not understand why can not you merge this function into
> index_def building. It is needed in a single place, and makes redundant
> scan of ExprList.
> 
> > +{
> > + struct region *r = &fiber()->gc;
> > + size_t total_sql_size = 0;
> > + append(r, "CREATE INDEX ", &total_sql_size);
> > + append(r, idx_name, &total_sql_size);
> > + append(r, " ON ", &total_sql_size);
> > + append(r, space_def->name, &total_sql_size);
> > + append(r, " (", &total_sql_size);
> > +
> > + for (int i = 0; i < expr_list->nExpr; i++){
> > + Expr *expr = expr_list->a[i].pExpr;
> > + assert(expr->op == TK_COLLATE || expr->op == TK_COLUMN);
> > + Expr *column_expr = sqlite3ExprSkipCollate(expr);
> > + const char *name = space_def->fields[column_expr->iColumn].name;
> > +
> > + if (expr->op == TK_COLLATE){
> > + append(r, name, &total_sql_size);
> > + append(r, " COLLATE ", &total_sql_size);
> > + const char *coll_name = expr->u.zToken;
> > + append(r, coll_name, &total_sql_size);
> > + append(r, ", ", &total_sql_size);
> > + } else {
> > + append(r, name, &total_sql_size);
> > + append(r, ", ", &total_sql_size);
> > + }
> > + }
> > +
> > + memcpy(region_alloc(r, 1), "\0", 1);
> > + total_sql_size += 1;
> > + char *res = region_join(r, total_sql_size);
> > +
> > + /*
> > + * fix last ", " with ")\0"
> > + */
> > + res[strlen(res) - 2] = ')';
> > + res[strlen(res) - 1] = '\0';
> 
> 24. strlen has O(N) complexity. And here you already know the
> result: total_sql_size.
> 
> > + return res;
> > +}
> > +
> > +void
> > +set_index_def(Parse *parse, Index *index, Table *table, uint32_t iid,
> > + const char *name, uint32_t name_len, int on_error,
> > + ExprList *expr_list, u8 idx_type)
> 
> 25. Still bad alignment. And make this function be static.
> 
> 
> > +{
> > + struct space_def *space_def = table->def;
> > + struct index_opts opts;
> > + index_opts_create(&opts);
> > + opts.is_unique = on_error != ON_CONFLICT_ACTION_NONE;
> > +
> > + struct key_def *key_def = key_def_new(expr_list->nExpr);
> > + if (key_def == NULL)
> 
> 26. If key_def_new fails, you should inform the parser or
> db: either set Parse.nErr and Parser.rc, or sqlite3OomFaul(). Same
> about all other errors got from Tarantool functions.
> 
> > + return;
> > +
> > + for (int i = 0; i < expr_list->nExpr; i++) {
> > + Expr *expr = expr_list->a[i].pExpr;
> > + sql_resolve_self_reference(parse, table, NC_IdxExpr,
> > + expr, 0);
> 
> 27. Bad alignment. And as I can see it fits in one line.
> 
> Please check alignment during another self-review iteration in
> the whole patch. I will not mention it below again.
> 
> > + if (parse->nErr > 0)
> > + return;
> > +
> > + Expr *column_expr = sqlite3ExprSkipCollate(expr);
> > + if (column_expr->op != TK_COLUMN) {
> > + sqlite3ErrorMsg(parse,
> > + "functional indexes aren't supported "
> > + "in the current version");
> > + return;
> > + }
> > +
> > + uint32_t fieldno = column_expr->iColumn;
> > +
> > + uint32_t coll_id;
> > + struct coll *coll;
> > + if (expr->op == TK_COLLATE)
> > + coll = sql_get_coll_seq(parse, expr->u.zToken,
> > + &coll_id);
> > + else
> > + coll = sql_column_collation(space_def, fieldno,
> > + &coll_id);
> 
> 28. Please, use {}, when 'if' body consists of multiple lines.
> 
> > +
> > + if (sqlite3StrICmp(expr->u.zToken, "binary") != 0 &&
> > + coll == NULL && expr->op == TK_COLLATE)
> 
> 29. This check is needed in 'if (expr->op == TK_COLLATE)' above.
> And why do you do this youself? sql_get_coll_seq already sets
> the nErr in parser for this error.
> 
> > + return;
> > +
> > + /* Tarantool: DESC indexes are not supported so far.
> > + * See gh-3016.
> 
> 30. Please, obey Tarantool comment style:
> /*
>   * My comment inside the function.
>   * Second line.
>   */
> 
> And wrap the comment line on 66 ruler.
> 
> > void
> > @@ -2853,12 +2914,11 @@ sql_create_index(struct Parse *parse, struct Token *token,
> > {
> > Table *pTab = 0; /* Table to be indexed */
> > Index *pIndex = 0; /* The index to be created */
> > - char *zName = 0; /* Name of the index */
> > + char *name = 0; /* Name of the index */
> 
> 31. Please, use explicit NULL.
> 
> > int nName; /* Number of characters in zName */
> > - int i, j;
> > + int i;
> > DbFixer sFix; /* For assigning database names to pTable */
> > sqlite3 *db = parse->db;
> > - struct ExprList_item *col_listItem; /* For looping over col_list */
> > int nExtra = 0; /* Space allocated for zExtra[] */
> > char *zExtra = 0; /* Extra space after the Index object */
> > struct session *user_session = current_session();
> > @@ -3159,6 +3189,7 @@ sql_create_index(struct Parse *parse, struct Token *token,
> > }
> > if (idx_type == SQLITE_IDXTYPE_PRIMARYKEY)
> > pIdx->idxType = idx_type;
> > +
> > goto exit_create_index;
> 
> 32. Garbage diff. Please, find other garbage diffs and remove them.
> 
> > }
> > }
> > @@ -3268,28 +3299,7 @@ sql_create_index(struct Parse *parse, struct Token *token,
> > sql_expr_delete(db, where, false);
> > sql_expr_list_delete(db, col_list);
> > sqlite3SrcListDelete(db, tbl_name);
> 
> 33. I have noticed than on line 3056 collation names add extra bytes
> to struct Index object. Can you please investigate if they are not
> needed anymore and remove this code?
> 
> I am talking about it:
> 
> /* Figure out how many bytes of space are required to store explicitly
> * specified collation sequence names.
> */
> for (i = 0; i < col_list->nExpr; i++) {
> Expr *pExpr = col_list->a[i].pExpr;
> assert(pExpr != 0);
> if (pExpr->op == TK_COLLATE) {
> nExtra += (1 + sqlite3Strlen30(pExpr->u.zToken));
> }
> }
> 
> We do not store collation names in struct Index anymore.
> 
> > @@ -3297,15 +3307,8 @@ bool
> > index_is_unique_not_null(const Index *idx)
> > {
> > assert(idx != NULL);
> > - uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->tnum);
> > - struct space *space = space_by_id(space_id);
> > - assert(space != NULL);
> > -
> > - uint32_t index_id = SQLITE_PAGENO_TO_INDEXID(idx->tnum);
> > - struct index *index = space_index(space, index_id);
> > - assert(index != NULL);
> > - return (index->def->opts.is_unique &&
> > - !index->def->key_def->is_nullable);
> > + assert(idx->def != NULL);
> > + return (idx->def->key_def->is_nullable && idx->def->opts.is_unique);
> 
> 34. This one-line function is used in a single place. Please, inline
> it and remove.
> 
> > }
> > 
> > void
> > @@ -3933,18 +3936,18 @@ sqlite3UniqueConstraint(Parse * pParse, /* Parsing context */
> > )
> > {
> > char *zErr;
> > - int j;
> > + uint32_t j;
> > StrAccum errMsg;
> > Table *pTab = pIdx->pTable;
> > 
> > sqlite3StrAccumInit(&errMsg, pParse->db, 0, 0, 200);
> > if (pIdx->aColExpr) {
> > - sqlite3XPrintf(&errMsg, "index '%q'", pIdx->zName);
> > + sqlite3XPrintf(&errMsg, "index '%q'", pIdx->def->name);
> > } else {
> > - for (j = 0; j < pIdx->nColumn; j++) {
> > + for (j = 0; j < pIdx->def->key_def->part_count; j++) {
> > char *zCol;
> > - assert(pIdx->aiColumn[j] >= 0);
> > - zCol = pTab->def->fields[pIdx->aiColumn[j]].name;
> > + uint32_t fieldno = pIdx->def->key_def->parts[j].fieldno;
> > + zCol = pTab->def->fields[fieldno].name;
> > if (j)
> > sqlite3StrAccumAppend(&errMsg, ", ", 2);
> > sqlite3XPrintf(&errMsg, "%s.%s", pTab->def->name, zCol);
> > @@ -3967,11 +3970,10 @@ static bool
> > collationMatch(struct coll *coll, struct Index *index)
> > {
> > assert(coll != NULL);
> > - for (int i = 0; i < index->nColumn; i++) {
> > - uint32_t id;
> > - struct coll *idx_coll = sql_index_collation(index, i, &id);
> > - assert(idx_coll != 0 || index->aiColumn[i] < 0);
> > - if (index->aiColumn[i] >= 0 && coll == idx_coll)
> > + for (uint32_t i = 0; i < index->def->key_def->part_count; i++) {
> > + struct coll *idx_coll = index->def->key_def->parts[i].coll;
> > + assert(idx_coll != NULL);
> > + if (coll == idx_coll)
> > return true;
> > }
> > return false;
> > diff --git a/src/box/sql/delete.c b/src/box/sql/delete.c
> > index ddad54b3e..504738cd5 100644
> > --- a/src/box/sql/delete.c
> > +++ b/src/box/sql/delete.c
> > @@ -252,11 +252,11 @@ sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
> > /* Extract the primary key for the current row */
> > if (!is_view) {
> > for (int i = 0; i < pk_len; i++) {
> > - assert(pk->aiColumn[i] >= 0);
> > sqlite3ExprCodeGetColumnOfTable(v, table->def,
> > tab_cursor,
> > - pk->
> > - aiColumn[i],
> > + pk->def->
> > + key_def->
> > + parts[i].fieldno,
> 
> 35. Please, just save pk->def->key_def->parts above in a separate
> variable, and use here only part->fieldno and ++part above.
—
Thank you for the review. All the issues are fixed. Here is the patch:
sql: add index_def to Index

Now every sqlite struct Index is created with tnt struct
index_def inside. This allows us to use tnt index_def
in work with sqlite indexes in the same manner as with
tnt index and is a step to remove sqlite Index with
tnt index.
Fields coll_array, coll_id_array, aiColumn, sort_order
and zName are removed from Index. All usages of this
fields changed to usage of corresponding index_def
fields.
index_is_unique(), sql_index_collation() and
index_column_count() are removed with calls of
index_def corresponding fields.

Closes: #3369
---
Branch: https://github.com/tarantool/tarantool/tree/sb/gh-3369-use-index-def-in-select-and-where
Issue: https://github.com/tarantool/tarantool/issues/3369

 src/box/sql.c           |  54 +++---
 src/box/sql/analyze.c   |  40 ++--
 src/box/sql/build.c     | 488 +++++++++++++++++++++++-------------------------
 src/box/sql/delete.c    |  17 +-
 src/box/sql/expr.c      |  60 +++---
 src/box/sql/fkey.c      |  47 ++---
 src/box/sql/insert.c    | 148 ++++++---------
 src/box/sql/pragma.c    |  32 ++--
 src/box/sql/select.c    |   2 +-
 src/box/sql/sqliteInt.h |  63 +------
 src/box/sql/trigger.c   |   2 -
 src/box/sql/update.c    |  10 +-
 src/box/sql/vdbeaux.c   |   2 +-
 src/box/sql/vdbemem.c   |   4 +-
 src/box/sql/where.c     | 168 ++++++++---------
 src/box/sql/wherecode.c |  54 +++---
 src/box/sql/whereexpr.c |  15 --
 17 files changed, 532 insertions(+), 674 deletions(-)

diff --git a/src/box/sql.c b/src/box/sql.c
index 7379cb418..213f8e453 100644
--- a/src/box/sql.c
+++ b/src/box/sql.c
@@ -1442,8 +1442,8 @@ int tarantoolSqlite3MakeTableFormat(Table *pTable, void *buf)
 
 	/* If table's PK is single column which is INTEGER, then
 	 * treat it as strict type, not affinity.  */
-	if (pk_idx && pk_idx->nColumn == 1) {
-		int pk = pk_idx->aiColumn[0];
+	if (pk_idx != NULL && pk_idx->def->key_def->part_count == 1) {
+		int pk = pk_idx->def->key_def->parts[0].fieldno;
 		if (def->fields[pk].type == FIELD_TYPE_INTEGER)
 			pk_forced_int = pk;
 	}
@@ -1552,20 +1552,19 @@ tarantoolSqlite3MakeTableOpts(Table *pTable, const char *zSql, char *buf)
  */
 int tarantoolSqlite3MakeIdxParts(SqliteIndex *pIndex, void *buf)
 {
-	struct space_def *def = pIndex->pTable->def;
-	assert(def != NULL);
+	struct field_def *fields = pIndex->pTable->def->fields;
+	struct key_def *key_def = pIndex->def->key_def;
 	const struct Enc *enc = get_enc(buf);
-	struct SqliteIndex *primary_index;
-	char *base = buf, *p;
-	int pk_forced_int = -1;
-
-	primary_index = sqlite3PrimaryKeyIndex(pIndex->pTable);
+	char *base = buf;
+	uint32_t pk_forced_int = UINT32_MAX;
+	struct SqliteIndex *primary_index =
+		sqlite3PrimaryKeyIndex(pIndex->pTable);
 
 	/* If table's PK is single column which is INTEGER, then
 	 * treat it as strict type, not affinity.  */
-	if (primary_index->nColumn == 1) {
-		int pk = primary_index->aiColumn[0];
-		if (def->fields[pk].type == FIELD_TYPE_INTEGER)
+	if (primary_index->def->key_def->part_count == 1) {
+		int pk = primary_index->def->key_def->parts[0].fieldno;
+		if (fields[pk].type == FIELD_TYPE_INTEGER)
 			pk_forced_int = pk;
 	}
 
@@ -1575,46 +1574,45 @@ int tarantoolSqlite3MakeIdxParts(SqliteIndex *pIndex, void *buf)
 	 * primary key columns. Query planner depends on this particular
 	 * data layout.
 	 */
-	int i, n = pIndex->nColumn;
-
-	p = enc->encode_array(base, n);
-	for (i = 0; i < n; i++) {
-		int col = pIndex->aiColumn[i];
-		assert(def->fields[col].is_nullable ==
-		       action_is_nullable(def->fields[col].nullable_action));
+	struct key_part *part = key_def->parts;
+	char *p = enc->encode_array(base, key_def->part_count);
+	for (uint32_t i = 0; i < key_def->part_count; ++i, ++part) {
+		uint32_t col = part->fieldno;
+		assert(fields[col].is_nullable ==
+		       action_is_nullable(fields[col].nullable_action));
 		const char *t;
 		if (pk_forced_int == col) {
 			t = "integer";
 		} else {
-			enum affinity_type affinity = def->fields[col].affinity;
-			t = convertSqliteAffinity(affinity,
-						  def->fields[col].is_nullable);
+			t = convertSqliteAffinity(fields[col].affinity,
+						  fields[col].is_nullable);
 		}
 		/* do not decode default collation */
-		uint32_t cid = pIndex->coll_id_array[i];
+		uint32_t cid = part->coll_id;
 		p = enc->encode_map(p, cid == COLL_NONE ? 5 : 6);
 		p = enc->encode_str(p, "type", sizeof("type")-1);
 		p = enc->encode_str(p, t, strlen(t));
 		p = enc->encode_str(p, "field", sizeof("field")-1);
 		p = enc->encode_uint(p, col);
 		if (cid != COLL_NONE) {
-			p = enc->encode_str(p, "collation", sizeof("collation")-1);
+			p = enc->encode_str(p, "collation",
+					    sizeof("collation") - 1);
 			p = enc->encode_uint(p, cid);
 		}
 		p = enc->encode_str(p, "is_nullable", 11);
-		p = enc->encode_bool(p, def->fields[col].is_nullable);
+		p = enc->encode_bool(p, fields[col].is_nullable);
 		p = enc->encode_str(p, "nullable_action", 15);
 		const char *action_str =
-			on_conflict_action_strs[def->fields[col].nullable_action];
+			on_conflict_action_strs[fields[col].nullable_action];
 		p = enc->encode_str(p, action_str, strlen(action_str));
 
 		p = enc->encode_str(p, "sort_order", 10);
-		enum sort_order sort_order = pIndex->sort_order[i];
+		enum sort_order sort_order = part->sort_order;
 		assert(sort_order < sort_order_MAX);
 		const char *sort_order_str = sort_order_strs[sort_order];
 		p = enc->encode_str(p, sort_order_str, strlen(sort_order_str));
 	}
-	return (int)(p - base);
+	return p - base;
 }
 
 /*
diff --git a/src/box/sql/analyze.c b/src/box/sql/analyze.c
index afc824a1a..31de7ab05 100644
--- a/src/box/sql/analyze.c
+++ b/src/box/sql/analyze.c
@@ -849,7 +849,6 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 		int addrRewind;	/* Address of "OP_Rewind iIdxCur" */
 		int addrNextRow;	/* Address of "next_row:" */
 		const char *zIdxName;	/* Name of the index */
-		int nColTest;	/* Number of columns to test for changes */
 
 		if (pOnlyIdx && pOnlyIdx != pIdx)
 			continue;
@@ -860,9 +859,9 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 		if (IsPrimaryKeyIndex(pIdx)) {
 			zIdxName = pTab->def->name;
 		} else {
-			zIdxName = pIdx->zName;
+			zIdxName = pIdx->def->name;
 		}
-		nColTest = index_column_count(pIdx);
+		int nColTest = pIdx->def->key_def->part_count;
 
 		/* Populate the register containing the index name. */
 		sqlite3VdbeLoadString(v, regIdxname, zIdxName);
@@ -917,7 +916,7 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 		sqlite3VdbeAddOp3(v, OP_OpenRead, iIdxCur, pIdx->tnum,
 				  space_ptr_reg);
 		sql_vdbe_set_p4_key_def(pParse, pIdx);
-		VdbeComment((v, "%s", pIdx->zName));
+		VdbeComment((v, "%s", pIdx->def->name));
 
 		/* Invoke the stat_init() function. The arguments are:
 		 *
@@ -969,7 +968,7 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 			 */
 			sqlite3VdbeAddOp0(v, OP_Goto);
 			addrNextRow = sqlite3VdbeCurrentAddr(v);
-			if (nColTest == 1 && index_is_unique(pIdx)) {
+			if (nColTest == 1 && pIdx->def->opts.is_unique) {
 				/* For a single-column UNIQUE index, once we have found a non-NULL
 				 * row, we know that all the rest will be distinct, so skip
 				 * subsequent distinctness tests.
@@ -978,13 +977,12 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 						  endDistinctTest);
 				VdbeCoverage(v);
 			}
-			for (i = 0; i < nColTest; i++) {
-				uint32_t id;
-				struct coll *coll =
-					sql_index_collation(pIdx, i, &id);
+			struct key_part *part = pIdx->def->key_def->parts;
+			for (i = 0; i < nColTest; ++i, ++part) {
+				struct coll *coll = part->coll;
 				sqlite3VdbeAddOp2(v, OP_Integer, i, regChng);
 				sqlite3VdbeAddOp3(v, OP_Column, iIdxCur,
-						  pIdx->aiColumn[i], regTemp);
+						  part->fieldno, regTemp);
 				aGotoChng[i] =
 				    sqlite3VdbeAddOp4(v, OP_Ne, regTemp, 0,
 						      regPrev + i, (char *)coll,
@@ -1006,7 +1004,8 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 			for (i = 0; i < nColTest; i++) {
 				sqlite3VdbeJumpHere(v, aGotoChng[i]);
 				sqlite3VdbeAddOp3(v, OP_Column, iIdxCur,
-						  pIdx->aiColumn[i],
+						  pIdx->def->key_def->
+							  parts[i].fieldno,
 						  regPrev + i);
 			}
 			sqlite3VdbeResolveLabel(v, endDistinctTest);
@@ -1022,15 +1021,14 @@ analyzeOneTable(Parse * pParse,	/* Parser context */
 		 */
 		assert(regKey == (regStat4 + 2));
 		Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
-		int j, k, regKeyStat;
-		int nPkColumn = (int)index_column_count(pPk);
-		regKeyStat = sqlite3GetTempRange(pParse, nPkColumn);
-		for (j = 0; j < nPkColumn; j++) {
-			k = pPk->aiColumn[j];
-			assert(k >= 0 && k < (int)pTab->def->field_count);
-			sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k, regKeyStat + j);
-			VdbeComment((v, "%s",
-				pTab->def->fields[pPk->aiColumn[j]].name));
+		int nPkColumn = (int) pPk->def->key_def->part_count;
+		int regKeyStat = sqlite3GetTempRange(pParse, nPkColumn);
+		for (int j = 0; j < nPkColumn; ++j) {
+			int k = pPk->def->key_def->parts[j].fieldno;
+			assert(k >= 0 && k < (int) pTab->def->field_count);
+			sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k,
+					  regKeyStat + j);
+			VdbeComment((v, "%s", pTab->def->fields[k].name));
 		}
 		sqlite3VdbeAddOp3(v, OP_MakeRecord, regKeyStat,
 				  nPkColumn, regKey);
@@ -1150,7 +1148,7 @@ analyzeTable(Parse * pParse, Table * pTab, Index * pOnlyIdx)
 	iStatCur = pParse->nTab;
 	pParse->nTab += 3;
 	if (pOnlyIdx) {
-		openStatTable(pParse, iStatCur, pOnlyIdx->zName, "idx");
+		openStatTable(pParse, iStatCur, pOnlyIdx->def->name, "idx");
 	} else {
 		openStatTable(pParse, iStatCur, pTab->def->name, "tbl");
 	}
diff --git a/src/box/sql/build.c b/src/box/sql/build.c
index 62d687b17..f18727c61 100644
--- a/src/box/sql/build.c
+++ b/src/box/sql/build.c
@@ -253,6 +253,8 @@ freeIndex(sqlite3 * db, Index * p)
 {
 	sql_expr_delete(db, p->pPartIdxWhere, false);
 	sql_expr_list_delete(db, p->aColExpr);
+	if (p->def != NULL)
+		index_def_delete(p->def);
 	sqlite3DbFree(db, p->zColAff);
 	sqlite3DbFree(db, p);
 }
@@ -271,7 +273,8 @@ sqlite3UnlinkAndDeleteIndex(sqlite3 * db, Index * pIndex)
 
 	struct session *user_session = current_session();
 
-	pIndex = sqlite3HashInsert(&pIndex->pTable->idxHash, pIndex->zName, 0);
+	pIndex = sqlite3HashInsert(&pIndex->pTable->idxHash,
+				   pIndex->def->name, 0);
 	if (ALWAYS(pIndex)) {
 		if (pIndex->pTable->pIndex == pIndex) {
 			pIndex->pTable->pIndex = pIndex->pNext;
@@ -388,7 +391,7 @@ deleteTable(sqlite3 * db, Table * pTable)
 		pNext = pIndex->pNext;
 		assert(pIndex->pSchema == pTable->pSchema);
 		if ((db == 0 || db->pnBytesFreed == 0)) {
-			char *zName = pIndex->zName;
+			char *zName = pIndex->def->name;
 			TESTONLY(Index *
 				 pOld =) sqlite3HashInsert(&pTable->idxHash,
 							   zName, 0);
@@ -1058,7 +1061,7 @@ sqlite3AddCollateType(Parse * pParse, Token * pToken)
 	Table *p = pParse->pNewTable;
 	if (p == NULL)
 		return;
-	int i = p->def->field_count - 1;
+	uint32_t i = p->def->field_count - 1;
 	sqlite3 *db = pParse->db;
 	char *zColl = sqlite3NameFromToken(db, pToken);
 	if (!zColl)
@@ -1066,22 +1069,20 @@ sqlite3AddCollateType(Parse * pParse, Token * pToken)
 	uint32_t *id = &p->def->fields[i].coll_id;
 	p->aCol[i].coll = sql_get_coll_seq(pParse, zColl, id);
 	if (p->aCol[i].coll != NULL) {
-		Index *pIdx;
 		/* If the column is declared as "<name> PRIMARY KEY COLLATE <type>",
 		 * then an index may have been created on this column before the
 		 * collation type was added. Correct this if it is the case.
 		 */
-		for (pIdx = p->pIndex; pIdx; pIdx = pIdx->pNext) {
-			assert(pIdx->nColumn == 1);
-			if (pIdx->aiColumn[0] == i) {
-				id = &pIdx->coll_id_array[0];
-				pIdx->coll_array[0] =
+		for (struct Index *pIdx = p->pIndex; pIdx; pIdx = pIdx->pNext) {
+			assert(pIdx->def->key_def->part_count == 1);
+			if (pIdx->def->key_def->parts[0].fieldno == i) {
+				pIdx->def->key_def->parts[0].coll_id = *id;
+				pIdx->def->key_def->parts[0].coll =
 					sql_column_collation(p->def, i, id);
 			}
 		}
-	} else {
-		sqlite3DbFree(db, zColl);
 	}
+	sqlite3DbFree(db, zColl);
 }
 
 struct coll *
@@ -1111,66 +1112,6 @@ sql_column_collation(struct space_def *def, uint32_t column, uint32_t *coll_id)
 	return space->format->fields[column].coll;
 }
 
-struct key_def*
-sql_index_key_def(struct Index *idx)
-{
-	uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->tnum);
-	uint32_t index_id = SQLITE_PAGENO_TO_INDEXID(idx->tnum);
-	struct space *space = space_by_id(space_id);
-	assert(space != NULL);
-	struct index *index = space_index(space, index_id);
-	assert(index != NULL && index->def != NULL);
-	return index->def->key_def;
-}
-
-struct coll *
-sql_index_collation(Index *idx, uint32_t column, uint32_t *coll_id)
-{
-	assert(idx != NULL);
-	uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->pTable->tnum);
-	struct space *space = space_by_id(space_id);
-
-	assert(column < idx->nColumn);
-	/*
-	 * If space is still under construction, or it is
-	 * an ephemeral space, then fetch collation from
-	 * SQL internal structure.
-	 */
-	if (space == NULL) {
-		assert(column < idx->nColumn);
-		*coll_id = idx->coll_id_array[column];
-		return idx->coll_array[column];
-	}
-
-	struct key_def *key_def = sql_index_key_def(idx);
-	assert(key_def != NULL && key_def->part_count >= column);
-	*coll_id = key_def->parts[column].coll_id;
-	return key_def->parts[column].coll;
-}
-
-enum sort_order
-sql_index_column_sort_order(Index *idx, uint32_t column)
-{
-	assert(idx != NULL);
-	uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->pTable->tnum);
-	struct space *space = space_by_id(space_id);
-
-	assert(column < idx->nColumn);
-	/*
-	 * If space is still under construction, or it is
-	 * an ephemeral space, then fetch collation from
-	 * SQL internal structure.
-	 */
-	if (space == NULL) {
-		assert(column < idx->nColumn);
-		return idx->sort_order[column];
-	}
-
-	struct key_def *key_def = sql_index_key_def(idx);
-	assert(key_def != NULL && key_def->part_count >= column);
-	return key_def->parts[column].sort_order;
-}
-
 /**
  * Return true if space which corresponds to
  * given table has view option.
@@ -1383,14 +1324,16 @@ createTableStmt(sqlite3 * db, Table * p)
 	return zStmt;
 }
 
-/* Return true if value x is found any of the first nCol entries of aiCol[]
- */
 static int
-hasColumn(const i16 * aiCol, int nCol, int x)
+hasColumn(const struct key_part *key_parts, int nCol, uint32_t fieldno)
 {
-	while (nCol-- > 0)
-		if (x == *(aiCol++))
+	int i = 0;
+	while (i < nCol) {
+		if (fieldno == key_parts->fieldno)
 			return 1;
+		key_parts++;
+		i++;
+	}
 	return 0;
 }
 
@@ -1410,13 +1353,12 @@ static void
 convertToWithoutRowidTable(Parse * pParse, Table * pTab)
 {
 	Index *pPk;
-	int i, j;
 	sqlite3 *db = pParse->db;
 
 	/* Mark every PRIMARY KEY column as NOT NULL (except for imposter tables)
 	 */
 	if (!db->init.imposterTable) {
-		for (i = 0; i < (int)pTab->def->field_count; i++) {
+		for (uint32_t i = 0; i < pTab->def->field_count; i++) {
 			if (pTab->aCol[i].is_primkey) {
 				pTab->def->fields[i].nullable_action
 					= ON_CONFLICT_ACTION_ABORT;
@@ -1454,14 +1396,28 @@ convertToWithoutRowidTable(Parse * pParse, Table * pTab)
 		 * "PRIMARY KEY(a,b,a,b,c,b,c,d)" into just "PRIMARY KEY(a,b,c,d)".  Later
 		 * code assumes the PRIMARY KEY contains no repeated columns.
 		 */
-		for (i = j = 1; i < pPk->nColumn; i++) {
-			if (hasColumn(pPk->aiColumn, j, pPk->aiColumn[i])) {
-				pPk->nColumn--;
-			} else {
-				pPk->aiColumn[j++] = pPk->aiColumn[i];
+
+		struct key_part *parts = pPk->def->key_def->parts;
+		uint32_t part_count = pPk->def->key_def->part_count;
+		uint32_t new_part_count = part_count;
+
+		for (uint32_t i = 1; i < part_count; i++) {
+			if (hasColumn(parts, i, parts[i].fieldno)){
+				new_part_count--;
+				bool is_found = false;
+				for (uint32_t j = i + 1; j < part_count; j++){
+					if (!(hasColumn(parts, j,
+							parts[j].fieldno))) {
+						parts[i] = parts[j];
+						is_found = true;
+						break;
+					}
+				}
+				if (!(is_found))
+					break;
 			}
 		}
-		pPk->nColumn = j;
+		pPk->def->key_def->part_count = new_part_count;
 	}
 	assert(pPk != 0);
 }
@@ -1543,7 +1499,7 @@ createIndex(Parse * pParse, Index * pIndex, int iSpaceId, int iIndexId,
 	}
 	sqlite3VdbeAddOp4(v,
 			  OP_String8, 0, iFirstCol + 2, 0,
-			  sqlite3DbStrDup(pParse->db, pIndex->zName),
+			  sqlite3DbStrDup(pParse->db, pIndex->def->name),
 			  P4_DYNAMIC);
 	sqlite3VdbeAddOp4(v, OP_String8, 0, iFirstCol + 3, 0, "tree",
 			  P4_STATIC);
@@ -1580,7 +1536,7 @@ makeIndexSchemaRecord(Parse * pParse,
 
 	sqlite3VdbeAddOp4(v,
 			  OP_String8, 0, iFirstCol, 0,
-			  sqlite3DbStrDup(pParse->db, pIndex->zName),
+			  sqlite3DbStrDup(pParse->db, pIndex->def->name),
 			  P4_DYNAMIC);
 
 	if (pParse->pNewTable) {
@@ -2652,14 +2608,15 @@ sqlite3RefillIndex(Parse * pParse, Index * pIndex, int memRootPage)
 	} else {
 		tnum = pIndex->tnum;
 	}
-	struct key_def *def = key_def_dup(sql_index_key_def(pIndex));
+	struct key_def *def = key_def_dup(pIndex->def->key_def);
 	if (def == NULL) {
 		sqlite3OomFault(db);
 		return;
 	}
 	/* Open the sorter cursor if we are to use one. */
 	iSorter = pParse->nTab++;
-	sqlite3VdbeAddOp4(v, OP_SorterOpen, iSorter, 0, pIndex->nColumn,
+	sqlite3VdbeAddOp4(v, OP_SorterOpen, iSorter, 0,
+			  pIndex->def->key_def->part_count,
 			  (char *)def, P4_KEYDEF);
 
 	/* Open the table. Loop through all rows of the table, inserting index
@@ -2692,7 +2649,7 @@ sqlite3RefillIndex(Parse * pParse, Index * pIndex, int memRootPage)
 		sqlite3VdbeGoto(v, j2);
 		addr2 = sqlite3VdbeCurrentAddr(v);
 		sqlite3VdbeAddOp4Int(v, OP_SorterCompare, iSorter, j2,
-				     regRecord, pIndex->nColumn);
+				     regRecord, pIndex->def->key_def->part_count);
 		VdbeCoverage(v);
 		sqlite3UniqueConstraint(pParse, ON_CONFLICT_ACTION_ABORT,
 					pIndex);
@@ -2730,24 +2687,13 @@ sqlite3AllocateIndexObject(sqlite3 * db,	/* Database connection */
 	int nByte;		/* Bytes of space for Index object + arrays */
 
 	nByte = ROUND8(sizeof(Index)) +		    /* Index structure   */
-	    ROUND8(sizeof(struct coll *) * nCol) +  /* Index.coll_array  */
-	    ROUND8(sizeof(uint32_t) * nCol) +       /* Index.coll_id_array*/
-	    ROUND8(sizeof(LogEst) * (nCol + 1) +    /* Index.aiRowLogEst */
-		   sizeof(i16) * nCol +		    /* Index.aiColumn    */
-		   sizeof(enum sort_order) * nCol); /* Index.sort_order  */
+	    ROUND8(sizeof(LogEst) * (nCol + 1));    /* Index.aiRowLogEst */
 	p = sqlite3DbMallocZero(db, nByte + nExtra);
 	if (p) {
 		char *pExtra = ((char *)p) + ROUND8(sizeof(Index));
-		p->coll_array = (struct coll **)pExtra;
-		pExtra += ROUND8(sizeof(struct coll **) * nCol);
-		p->coll_id_array = (uint32_t *) pExtra;
-		pExtra += ROUND8(sizeof(uint32_t) * nCol);
 		p->aiRowLogEst = (LogEst *) pExtra;
 		pExtra += sizeof(LogEst) * (nCol + 1);
-		p->aiColumn = (i16 *) pExtra;
 		pExtra += sizeof(i16) * nCol;
-		p->sort_order = (enum sort_order *) pExtra;
-		p->nColumn = nCol;
 		*ppExtra = ((char *)p) + nByte;
 	}
 	return p;
@@ -2836,18 +2782,133 @@ addIndexToTable(Index * pIndex, Table * pTab)
 	}
 }
 
-bool
-index_is_unique(Index *idx)
+static inline void
+append_string_part(struct region *r, const char *str,
+		  size_t *total_sql_size, Parse *parse)
 {
-	assert(idx != NULL);
-	uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->tnum);
-	uint32_t index_id = SQLITE_PAGENO_TO_INDEXID(idx->tnum);
-	struct space *space = space_by_id(space_id);
-	assert(space != NULL);
-	struct index *tnt_index = space_index(space, index_id);
-	assert(tnt_index != NULL);
+	char * str_part = region_alloc(r, strlen(str));
+	if (str_part == NULL){
+		diag_set(OutOfMemory, strlen(str),
+			 "region_alloc", "str_part");
+		parse->rc = SQL_TARANTOOL_ERROR;
+		parse->nErr++;
+	}
+	memcpy(str_part, str, strlen(str));
+	*total_sql_size += strlen(str);
+}
+
+void static
+set_index_def(Parse *parse, Index *index, Table *table, uint32_t iid,
+	      const char *name, uint32_t name_len, int on_error,
+	      struct ExprList *expr_list, u8 idx_type)
+{
+	struct space_def *space_def = table->def;
+	struct index_opts opts;
+	index_opts_create(&opts);
+	opts.is_unique = on_error != ON_CONFLICT_ACTION_NONE;
+
+	struct key_def *key_def = key_def_new(expr_list->nExpr);
+	if (key_def == NULL) {
+		parse->rc = SQL_TARANTOOL_ERROR;
+		parse->nErr++;
+		return;
+	}
+
+	/*
+	 * Build initial parts of SQL statement.
+	 */
+
+	struct region *r = &fiber()->gc;
+	size_t total_sql_size = 0;
+
+	if (idx_type == SQLITE_IDXTYPE_APPDEF) {
+		append_string_part(r, "CREATE INDEX ", &total_sql_size,
+				   parse);
+		append_string_part(r, name, &total_sql_size, parse);
+		append_string_part(r, " ON ", &total_sql_size, parse);
+		append_string_part(r, space_def->name, &total_sql_size,
+				   parse);
+		append_string_part(r, " (", &total_sql_size, parse);
+	}
+
+	for (int i = 0; i < expr_list->nExpr; i++) {
+		Expr *expr = expr_list->a[i].pExpr;
+		sql_resolve_self_reference(parse, table, NC_IdxExpr, expr, 0);
+		if (parse->nErr > 0)
+			return;
+
+		Expr *column_expr = sqlite3ExprSkipCollate(expr);
+		if (column_expr->op != TK_COLUMN) {
+			sqlite3ErrorMsg(parse,
+					"functional indexes aren't supported "
+					"in the current version");
+			return;
+		}
+
+		uint32_t fieldno = column_expr->iColumn;
+		uint32_t coll_id;
+		struct coll *coll;
+		if (expr->op == TK_COLLATE) {
+			coll = sql_get_coll_seq(parse, expr->u.zToken,
+						&coll_id);
+
+			if (idx_type == SQLITE_IDXTYPE_APPDEF) {
+				append_string_part(r, name,
+						   &total_sql_size, parse);
+				append_string_part(r, " COLLATE ",
+						   &total_sql_size, parse);
+				const char *coll_name = expr->u.zToken;
+				append_string_part(r, coll_name,
+						   &total_sql_size, parse);
+				append_string_part(r, ", ",
+						   &total_sql_size, parse);
+			}
+		} else {
+			coll = sql_column_collation(space_def, fieldno,
+						    &coll_id);
+			if (idx_type == SQLITE_IDXTYPE_APPDEF) {
+				append_string_part(r, name,
+						   &total_sql_size, parse);
+				append_string_part(r, ", ",
+						   &total_sql_size, parse);
+			}
+		}
+
+		/*
+		* Tarantool: DESC indexes are not supported so far.
+		* See gh-3016.
+		*/
+		key_def_set_part(key_def, i, fieldno,
+				 space_def->fields[fieldno].type,
+				 space_def->fields[fieldno].nullable_action,
+				 coll, coll_id, SORT_ORDER_ASC);
+	}
 
-	return tnt_index->def->opts.is_unique;
+	if (parse->nErr > 0) {
+		index->def = NULL;
+		return;
+	}
+
+	if (idx_type == SQLITE_IDXTYPE_APPDEF) {
+		memcpy(region_alloc(r, 1), "\0", 1);
+		total_sql_size += 1;
+		opts.sql = region_join(r, total_sql_size);
+
+		/*
+		 * fix last ", " with ")\0" to finish the statement.
+		 */
+		opts.sql[total_sql_size - 3] = ')';
+		opts.sql[total_sql_size - 2] = '\0';
+	}
+
+	struct key_def *pk_key_def;
+	if (idx_type == SQLITE_IDXTYPE_APPDEF)
+		pk_key_def = table->pIndex->def->key_def;
+	else
+		pk_key_def = NULL;
+
+	index->def = index_def_new(space_def->id, iid, name, name_len,
+				   TREE, &opts, key_def, pk_key_def);
 }
 
 void
@@ -2856,16 +2917,14 @@ sql_create_index(struct Parse *parse, struct Token *token,
 		 int on_error, struct Token *start, struct Expr *where,
 		 enum sort_order sort_order, bool if_not_exist, u8 idx_type)
 {
-	Table *pTab = 0;	/* Table to be indexed */
-	Index *pIndex = 0;	/* The index to be created */
-	char *zName = 0;	/* Name of the index */
-	int nName;		/* Number of characters in zName */
-	int i, j;
+	Table *pTab = NULL;	/* Table to be indexed */
+	Index *pIndex = NULL;	/* The index to be created */
+	char *name = NULL;	/* Name of the index */
+	int name_len;		/* Number of characters in zName */
 	DbFixer sFix;		/* For assigning database names to pTable */
 	sqlite3 *db = parse->db;
-	struct ExprList_item *col_listItem;	/* For looping over col_list */
 	int nExtra = 0;		/* Space allocated for zExtra[] */
-	char *zExtra = 0;	/* Extra space after the Index object */
+	char *zExtra = NULL;	/* Extra space after the Index object */
 	struct session *user_session = current_session();
 
 	if (db->mallocFailed || parse->nErr > 0) {
@@ -2939,24 +2998,24 @@ sql_create_index(struct Parse *parse, struct Token *token,
 	 * our own name.
 	 */
 	if (token) {
-		zName = sqlite3NameFromToken(db, token);
-		if (zName == 0)
+		name = sqlite3NameFromToken(db, token);
+		if (name == NULL)
 			goto exit_create_index;
 		assert(token->z != 0);
 		if (!db->init.busy) {
-			if (sqlite3HashFind(&db->pSchema->tblHash, zName) !=
+			if (sqlite3HashFind(&db->pSchema->tblHash, name) !=
 			    NULL) {
 				sqlite3ErrorMsg(parse,
 						"there is already a table named %s",
-						zName);
+						name);
 				goto exit_create_index;
 			}
 		}
-		if (sqlite3HashFind(&pTab->idxHash, zName) != NULL) {
+		if (sqlite3HashFind(&pTab->idxHash, name) != NULL) {
 			if (!if_not_exist) {
 				sqlite3ErrorMsg(parse,
 						"index %s.%s already exists",
-						pTab->def->name, zName);
+						pTab->def->name, name);
 			} else {
 				assert(!db->init.busy);
 			}
@@ -2968,10 +3027,9 @@ sql_create_index(struct Parse *parse, struct Token *token,
 		for (pLoop = pTab->pIndex, n = 1; pLoop;
 		     pLoop = pLoop->pNext, n++) {
 		}
-		zName =
-		    sqlite3MPrintf(db, "sqlite_autoindex_%s_%d", pTab->def->name,
-				   n);
-		if (zName == 0) {
+		name = sqlite3MPrintf(db, "sqlite_autoindex_%s_%d",
+				      pTab->def->name, n);
+		if (name == NULL) {
 			goto exit_create_index;
 		}
 	}
@@ -2997,31 +3055,27 @@ sql_create_index(struct Parse *parse, struct Token *token,
 		sqlite3ExprListCheckLength(parse, col_list, "index");
 	}
 
-	/* Figure out how many bytes of space are required to store explicitly
-	 * specified collation sequence names.
-	 */
-	for (i = 0; i < col_list->nExpr; i++) {
-		Expr *pExpr = col_list->a[i].pExpr;
-		assert(pExpr != 0);
-		if (pExpr->op == TK_COLLATE) {
-			nExtra += (1 + sqlite3Strlen30(pExpr->u.zToken));
-		}
-	}
-
 	/*
 	 * Allocate the index structure.
 	 */
-	nName = sqlite3Strlen30(zName);
+	name_len = sqlite3Strlen30(name);
+
+	if (name_len > BOX_NAME_MAX) {
+		sqlite3ErrorMsg(parse,
+				"%s.%s exceeds indexes' names length limit",
+				pTab->def->name, name);
+		goto exit_create_index;
+	}
+
+	if (sqlite3CheckIdentifierName(parse, name) != SQLITE_OK)
+		goto exit_create_index;
+
 	pIndex = sqlite3AllocateIndexObject(db, col_list->nExpr,
-					    nName + nExtra + 1, &zExtra);
+					    name_len + nExtra + 1, &zExtra);
 	if (db->mallocFailed) {
 		goto exit_create_index;
 	}
 	assert(EIGHT_BYTE_ALIGNMENT(pIndex->aiRowLogEst));
-	assert(EIGHT_BYTE_ALIGNMENT(pIndex->coll_array));
-	pIndex->zName = zExtra;
-	zExtra += nName + 1;
-	memcpy(pIndex->zName, zName, nName + 1);
 	pIndex->pTable = pTab;
 	pIndex->onError = (u8) on_error;
 	/*
@@ -3036,7 +3090,6 @@ sql_create_index(struct Parse *parse, struct Token *token,
 		pIndex->idxType = idx_type;
 	}
 	pIndex->pSchema = db->pSchema;
-	pIndex->nColumn = col_list->nExpr;
 	/* Tarantool have access to each column by any index */
 	if (where) {
 		sql_resolve_self_reference(parse, pTab, NC_PartIdx, where,
@@ -3045,60 +3098,27 @@ sql_create_index(struct Parse *parse, struct Token *token,
 		where = NULL;
 	}
 
-	/* Analyze the list of expressions that form the terms of the index and
-	 * report any errors.  In the common case where the expression is exactly
-	 * a table column, store that column in aiColumn[].  For general expressions,
-	 * populate pIndex->aColExpr and store XN_EXPR (-2) in aiColumn[].
-	 *
+	/*
 	 * TODO: Issue a warning if two or more columns of the index are identical.
 	 * TODO: Issue a warning if the table primary key is used as part of the
 	 * index key.
 	 */
-	for (i = 0, col_listItem = col_list->a; i < col_list->nExpr;
-	     i++, col_listItem++) {
-		Expr *pCExpr;	/* The i-th index expression */
-		sql_resolve_self_reference(parse, pTab, NC_IdxExpr,
-					   col_listItem->pExpr, NULL);
-		if (parse->nErr > 0)
-			goto exit_create_index;
-		pCExpr = sqlite3ExprSkipCollate(col_listItem->pExpr);
-		if (pCExpr->op != TK_COLUMN) {
-			sqlite3ErrorMsg(parse,
-					"functional indexes aren't supported "
-					"in the current version");
-			goto exit_create_index;
-		} else {
-			j = pCExpr->iColumn;
-			assert(j <= 0x7fff);
-			if (j < 0) {
-				j = pTab->iPKey;
-			}
-			pIndex->aiColumn[i] = (i16) j;
-		}
-		struct coll *coll;
-		uint32_t id;
-		if (col_listItem->pExpr->op == TK_COLLATE) {
-			const char *coll_name = col_listItem->pExpr->u.zToken;
-			coll = sql_get_coll_seq(parse, coll_name, &id);
 
-			if (coll == NULL &&
-			    sqlite3StrICmp(coll_name, "binary") != 0) {
-				goto exit_create_index;
-			}
-		} else if (j >= 0) {
-			coll = sql_column_collation(pTab->def, j, &id);
-		} else {
-			id = COLL_NONE;
-			coll = NULL;
-		}
-		pIndex->coll_array[i] = coll;
-		pIndex->coll_id_array[i] = id;
+	uint32_t max_iid = 0;
+	for (Index *index = pTab->pIndex; index; index = index->pNext) {
+		max_iid = max_iid > index->def->iid ?
+			  max_iid :
+			  index->def->iid + 1;
+	}
 
-		/* Tarantool: DESC indexes are not supported so far.
-		 * See gh-3016.
-		 */
-		pIndex->sort_order[i] = SORT_ORDER_ASC;
+	set_index_def(parse, pIndex, pTab, max_iid, name, name_len, on_error,
+		      col_list, idx_type);
+
+	if (pIndex->def == NULL ||
+	    !index_def_is_valid(pIndex->def, pTab->def->name)) {
+		goto exit_create_index;
 	}
+
 	if (pTab == parse->pNewTable) {
 		/* This routine has been called to create an automatic index as a
 		 * result of a PRIMARY KEY or UNIQUE clause on a column definition, or
@@ -3123,25 +3143,27 @@ sql_create_index(struct Parse *parse, struct Token *token,
 		 */
 		Index *pIdx;
 		for (pIdx = pTab->pIndex; pIdx; pIdx = pIdx->pNext) {
-			int k;
+			uint32_t k;
 			assert(IsUniqueIndex(pIdx));
 			assert(pIdx->idxType != SQLITE_IDXTYPE_APPDEF);
 			assert(IsUniqueIndex(pIndex));
 
-			if (pIdx->nColumn != pIndex->nColumn)
+			if (pIdx->def->key_def->part_count !=
+			    pIndex->def->key_def->part_count) {
 				continue;
-			for (k = 0; k < pIdx->nColumn; k++) {
-				assert(pIdx->aiColumn[k] >= 0);
-				if (pIdx->aiColumn[k] != pIndex->aiColumn[k])
+			}
+			for (k = 0; k < pIdx->def->key_def->part_count; k++) {
+				if (pIdx->def->key_def->parts[k].fieldno !=
+				    pIndex->def->key_def->parts[k].fieldno) {
 					break;
+				}
 				struct coll *coll1, *coll2;
-				uint32_t id;
-				coll1 = sql_index_collation(pIdx, k, &id);
-				coll2 = sql_index_collation(pIndex, k, &id);
+				coll1 = pIdx->def->key_def->parts[k].coll;
+				coll2 = pIndex->def->key_def->parts[k].coll;
 				if (coll1 != coll2)
 					break;
 			}
-			if (k == pIdx->nColumn) {
+			if (k == pIdx->def->key_def->part_count) {
 				if (pIdx->onError != pIndex->onError) {
 					/* This constraint creates the same index as a previous
 					 * constraint specified somewhere in the CREATE TABLE statement.
@@ -3175,7 +3197,7 @@ sql_create_index(struct Parse *parse, struct Token *token,
 	assert(parse->nErr == 0);
 	if (db->init.busy) {
 		Index *p;
-		p = sqlite3HashInsert(&pTab->idxHash, pIndex->zName, pIndex);
+		p = sqlite3HashInsert(&pTab->idxHash, pIndex->def->name, pIndex);
 		if (p) {
 			assert(p == pIndex);	/* Malloc must have failed */
 			sqlite3OomFault(db);
@@ -3273,44 +3295,7 @@ sql_create_index(struct Parse *parse, struct Token *token,
 	sql_expr_delete(db, where, false);
 	sql_expr_list_delete(db, col_list);
 	sqlite3SrcListDelete(db, tbl_name);
-	sqlite3DbFree(db, zName);
-}
-
-/**
- * Return number of columns in given index.
- * If space is ephemeral, use internal
- * SQL structure to fetch the value.
- */
-uint32_t
-index_column_count(const Index *idx)
-{
-	assert(idx != NULL);
-	uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->tnum);
-	struct space *space = space_by_id(space_id);
-	/* It is impossible to find an ephemeral space by id. */
-	if (space == NULL)
-		return idx->nColumn;
-
-	uint32_t index_id = SQLITE_PAGENO_TO_INDEXID(idx->tnum);
-	struct index *index = space_index(space, index_id);
-	assert(index != NULL);
-	return index->def->key_def->part_count;
-}
-
-/** Return true if given index is unique and not nullable. */
-bool
-index_is_unique_not_null(const Index *idx)
-{
-	assert(idx != NULL);
-	uint32_t space_id = SQLITE_PAGENO_TO_SPACEID(idx->tnum);
-	struct space *space = space_by_id(space_id);
-	assert(space != NULL);
-
-	uint32_t index_id = SQLITE_PAGENO_TO_INDEXID(idx->tnum);
-	struct index *index = space_index(space, index_id);
-	assert(index != NULL);
-	return (index->def->opts.is_unique &&
-		!index->def->key_def->is_nullable);
+	sqlite3DbFree(db, name);
 }
 
 void
@@ -3938,18 +3923,19 @@ sqlite3UniqueConstraint(Parse * pParse,	/* Parsing context */
     )
 {
 	char *zErr;
-	int j;
+	uint32_t j;
 	StrAccum errMsg;
 	Table *pTab = pIdx->pTable;
 
 	sqlite3StrAccumInit(&errMsg, pParse->db, 0, 0, 200);
 	if (pIdx->aColExpr) {
-		sqlite3XPrintf(&errMsg, "index '%q'", pIdx->zName);
+		sqlite3XPrintf(&errMsg, "index '%q'", pIdx->def->name);
 	} else {
-		for (j = 0; j < pIdx->nColumn; j++) {
+		struct key_part *part = pIdx->def->key_def->parts;
+		for (j = 0; j < pIdx->def->key_def->part_count; j++, part++) {
 			char *zCol;
-			assert(pIdx->aiColumn[j] >= 0);
-			zCol = pTab->def->fields[pIdx->aiColumn[j]].name;
+			uint32_t fieldno = part->fieldno;
+			zCol = pTab->def->fields[fieldno].name;
 			if (j)
 				sqlite3StrAccumAppend(&errMsg, ", ", 2);
 			sqlite3XPrintf(&errMsg, "%s.%s", pTab->def->name, zCol);
@@ -3972,11 +3958,11 @@ static bool
 collationMatch(struct coll *coll, struct Index *index)
 {
 	assert(coll != NULL);
-	for (int i = 0; i < index->nColumn; i++) {
-		uint32_t id;
-		struct coll *idx_coll = sql_index_collation(index, i, &id);
-		assert(idx_coll != 0 || index->aiColumn[i] < 0);
-		if (index->aiColumn[i] >= 0 && coll == idx_coll)
+	struct key_part *part = index->def->key_def->parts;
+	for (uint32_t i = 0; i < index->def->key_def->part_count; i++, part++) {
+		struct coll *idx_coll = part->coll;
+		assert(idx_coll != NULL);
+		if (coll == idx_coll)
 			return true;
 	}
 	return false;
diff --git a/src/box/sql/delete.c b/src/box/sql/delete.c
index ddad54b3e..0314382f7 100644
--- a/src/box/sql/delete.c
+++ b/src/box/sql/delete.c
@@ -209,7 +209,7 @@ sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
 		} else {
 			pk = sqlite3PrimaryKeyIndex(table);
 			assert(pk != NULL);
-			pk_len = index_column_count(pk);
+			pk_len = pk->def->key_def->part_count;
 			parse->nMem += pk_len;
 			sqlite3VdbeAddOp2(v, OP_OpenTEphemeral, eph_cursor,
 					  pk_len);
@@ -251,12 +251,11 @@ sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
 
 		/* Extract the primary key for the current row */
 		if (!is_view) {
-			for (int i = 0; i < pk_len; i++) {
-				assert(pk->aiColumn[i] >= 0);
+			struct key_part *part = pk->def->key_def->parts;
+			for (int i = 0; i < pk_len; i++, part++) {
 				sqlite3ExprCodeGetColumnOfTable(v, table->def,
 								tab_cursor,
-								pk->
-								aiColumn[i],
+								part->fieldno,
 								reg_pk + i);
 			}
 		} else {
@@ -326,7 +325,7 @@ sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
 			sqlite3VdbeAddOp3(v, OP_OpenWrite, tab_cursor,
 					  table->tnum, space_ptr_reg);
 			sql_vdbe_set_p4_key_def(parse, pk);
-			VdbeComment((v, "%s", pk->zName));
+			VdbeComment((v, "%s", pk->def->name));
 
 			if (one_pass == ONEPASS_MULTI)
 				sqlite3VdbeJumpHere(v, iAddrOnce);
@@ -536,14 +535,14 @@ sql_generate_index_key(struct Parse *parse, struct Index *index, int cursor,
 			*part_idx_label = 0;
 		}
 	}
-	int col_cnt = index_column_count(index);
+	int col_cnt = index->def->key_def->part_count;
 	int reg_base = sqlite3GetTempRange(parse, col_cnt);
 	if (prev != NULL && (reg_base != reg_prev ||
 			     prev->pPartIdxWhere != NULL))
 		prev = NULL;
 	for (int j = 0; j < col_cnt; j++) {
-		if (prev != NULL && prev->aiColumn[j] == index->aiColumn[j]
-		    && prev->aiColumn[j] != XN_EXPR) {
+		if (prev->def->key_def->parts[j].fieldno ==
+		    index->def->key_def->parts[j].fieldno && prev == NULL) {
 			/*
 			 * This column was already computed by the
 			 * previous index.
diff --git a/src/box/sql/expr.c b/src/box/sql/expr.c
index 8866f6fed..a756535f0 100644
--- a/src/box/sql/expr.c
+++ b/src/box/sql/expr.c
@@ -2422,20 +2422,24 @@ sqlite3FindInIndex(Parse * pParse,	/* Parsing context */
 			     pIdx = pIdx->pNext) {
 				Bitmask colUsed; /* Columns of the index used */
 				Bitmask mCol;	/* Mask for the current column */
-				if (pIdx->nColumn < nExpr)
+				uint32_t part_count = pIdx->def->key_def->
+					part_count;
+				struct key_part *parts = pIdx->def->key_def->
+					parts;
+				if ((int)part_count < nExpr)
 					continue;
 				/* Maximum nColumn is BMS-2, not BMS-1, so that we can compute
 				 * BITMASK(nExpr) without overflowing
 				 */
-				testcase(pIdx->nColumn == BMS - 2);
-				testcase(pIdx->nColumn == BMS - 1);
-				if (pIdx->nColumn >= BMS - 1)
+				testcase(part_count == BMS - 2);
+				testcase(>part_count == BMS - 1);
+				if (part_count >= BMS - 1)
 					continue;
 				if (mustBeUnique) {
-					if (pIdx->nColumn > nExpr
-					    || (pIdx->nColumn > nExpr
-					    && !index_is_unique(pIdx))) {
-							continue;	/* This index is not unique over the IN RHS columns */
+					if ((int)part_count > nExpr
+					    || !pIdx->def->opts.is_unique) {
+						/* This index is not unique over the IN RHS columns */
+						continue;
 					}
 				}
 
@@ -2449,12 +2453,13 @@ sqlite3FindInIndex(Parse * pParse,	/* Parsing context */
 					int j;
 
 					for (j = 0; j < nExpr; j++) {
-						if (pIdx->aiColumn[j] !=
-						    pRhs->iColumn) {
+						if ((int) parts[j].fieldno
+						    != pRhs->iColumn) {
 							continue;
 						}
-						struct coll *idx_coll;
-						idx_coll = sql_index_collation(pIdx, j, &id);
+
+						struct coll *idx_coll =
+							     parts[j].coll;
 						if (pReq != NULL &&
 						    pReq != idx_coll) {
 							continue;
@@ -2483,17 +2488,16 @@ sqlite3FindInIndex(Parse * pParse,	/* Parsing context */
 							  0, 0, 0,
 							  sqlite3MPrintf(db,
 							  "USING INDEX %s FOR IN-OPERATOR",
-							  pIdx->zName),
+							  pIdx->def->name),
 							  P4_DYNAMIC);
 					emit_open_cursor(pParse, iTab,
 							 pIdx->tnum);
 					sql_vdbe_set_p4_key_def(pParse, pIdx);
-					VdbeComment((v, "%s", pIdx->zName));
+					VdbeComment((v, "%s", pIdx->def->name));
 					assert(IN_INDEX_INDEX_DESC ==
 					       IN_INDEX_INDEX_ASC + 1);
 					eType = IN_INDEX_INDEX_ASC +
-						sql_index_column_sort_order(pIdx,
-									    0);
+						parts[0].sort_order;
 
 					if (prRhsHasNull) {
 #ifdef SQLITE_ENABLE_COLUMN_USED_MASK
@@ -2515,7 +2519,7 @@ sqlite3FindInIndex(Parse * pParse,	/* Parsing context */
 							/* Tarantool: Check for null is performed on first key of the index.  */
 							sqlite3SetHasNullFlag(v,
 									      iTab,
-									      pIdx->aiColumn[0],
+									      parts[0].fieldno,
 									      *prRhsHasNull);
 						}
 					}
@@ -3146,12 +3150,12 @@ sqlite3ExprCodeIN(Parse * pParse,	/* Parsing and code generating context */
 		struct Index *pk = sqlite3PrimaryKeyIndex(tab);
 		assert(pk);
 
+		uint32_t fieldno = pk->def->key_def->parts[0].fieldno;
 		enum affinity_type affinity =
-			tab->def->fields[pk->aiColumn[0]].affinity;
-		if (pk->nColumn == 1
+			tab->def->fields[fieldno].affinity;
+		if (pk->def->key_def->part_count == 1
 		    && affinity == AFFINITY_INTEGER
-		    && pk->aiColumn[0] < nVector) {
-			int reg_pk = rLhs + pk->aiColumn[0];
+		    && (int) fieldno < nVector) { int reg_pk = rLhs + (int)fieldno;
 			sqlite3VdbeAddOp2(v, OP_MustBeInt, reg_pk, destIfFalse);
 		}
 	}
@@ -3483,17 +3487,9 @@ sqlite3ExprCodeLoadIndexColumn(Parse * pParse,	/* The parsing context */
 			       int regOut	/* Store the index column value in this register */
     )
 {
-	i16 iTabCol = pIdx->aiColumn[iIdxCol];
-	if (iTabCol == XN_EXPR) {
-		assert(pIdx->aColExpr);
-		assert(pIdx->aColExpr->nExpr > iIdxCol);
-		pParse->iSelfTab = iTabCur;
-		sqlite3ExprCodeCopy(pParse, pIdx->aColExpr->a[iIdxCol].pExpr,
-				    regOut);
-	} else {
-		sqlite3ExprCodeGetColumnOfTable(pParse->pVdbe, pIdx->pTable->def,
-						iTabCur, iTabCol, regOut);
-	}
+	i16 iTabCol = pIdx->def->key_def->parts[iIdxCol].fieldno;
+	sqlite3ExprCodeGetColumnOfTable(pParse->pVdbe, pIdx->pTable->def,
+					iTabCur, iTabCol, regOut);
 }
 
 void
diff --git a/src/box/sql/fkey.c b/src/box/sql/fkey.c
index 70ebef89f..79320eced 100644
--- a/src/box/sql/fkey.c
+++ b/src/box/sql/fkey.c
@@ -256,8 +256,8 @@ sqlite3FkLocateIndex(Parse * pParse,	/* Parse context to store any error in */
 	}
 
 	for (pIdx = pParent->pIndex; pIdx; pIdx = pIdx->pNext) {
-		int nIdxCol = index_column_count(pIdx);
-		if (nIdxCol == nCol && index_is_unique(pIdx)
+		int nIdxCol = pIdx->def->key_def->part_count;
+		if (nIdxCol == nCol && pIdx->def->opts.is_unique
 		    && pIdx->pPartIdxWhere == 0) {
 			/* pIdx is a UNIQUE index (or a PRIMARY KEY) and has the right number
 			 * of columns. If each indexed column corresponds to a foreign key
@@ -286,8 +286,10 @@ sqlite3FkLocateIndex(Parse * pParse,	/* Parse context to store any error in */
 				 * the default collation sequences for each column.
 				 */
 				int i, j;
-				for (i = 0; i < nCol; i++) {
-					i16 iCol = pIdx->aiColumn[i];	/* Index of column in parent tbl */
+				struct key_part *part =
+					pIdx->def->key_def->parts;
+				for (i = 0; i < nCol; i++, part++) {
+					i16 iCol = (int) part->fieldno;	/* Index of column in parent tbl */
 					char *zIdxCol;	/* Name of indexed column */
 
 					if (iCol < 0)
@@ -302,9 +304,7 @@ sqlite3FkLocateIndex(Parse * pParse,	/* Parse context to store any error in */
 					def_coll = sql_column_collation(pParent->def,
 									iCol,
 									&id);
-					struct coll *coll =
-						sql_index_collation(pIdx, i,
-								    &id);
+					struct coll *coll = part->coll;
 					if (def_coll != coll)
 						break;
 
@@ -464,13 +464,15 @@ fkLookupParent(Parse * pParse,	/* Parse context */
 				for (i = 0; i < nCol; i++) {
 					int iChild = aiCol[i] + 1 + regData;
 					int iParent =
-					    pIdx->aiColumn[i] + 1 + regData;
-					assert(pIdx->aiColumn[i] >= 0);
+						(int) pIdx->def->key_def->parts[i].fieldno
+						+ 1 + regData;
 					assert(aiCol[i] != pTab->iPKey);
-					if (pIdx->aiColumn[i] == pTab->iPKey) {
+					if ((int)pIdx->def->key_def->
+						parts[i].fieldno == pTab->iPKey) {
 						/* The parent key is a composite key that includes the IPK column */
 						iParent = regData;
 					}
+
 					sqlite3VdbeAddOp3(v, OP_Ne, iChild,
 							  iJump, iParent);
 					VdbeCoverage(v);
@@ -622,7 +624,7 @@ fkScanChildren(Parse * pParse,	/* Parse context */
 	Vdbe *v = sqlite3GetVdbe(pParse);
 
 	assert(pIdx == 0 || pIdx->pTable == pTab);
-	assert(pIdx == 0 || (int)index_column_count(pIdx) == pFKey->nCol);
+	assert(pIdx == 0 || (int) pIdx->def->key_def->part_count == pFKey->nCol);
 	assert(pIdx != 0);
 
 	if (nIncr < 0) {
@@ -646,7 +648,7 @@ fkScanChildren(Parse * pParse,	/* Parse context */
 		i16 iCol;	/* Index of column in child table */
 		const char *zCol;	/* Name of column in child table */
 
-		iCol = pIdx ? pIdx->aiColumn[i] : -1;
+		iCol = pIdx ? pIdx->def->key_def->parts[i].fieldno : -1;
 		pLeft = exprTableRegister(pParse, pTab, regData, iCol);
 		iCol = aiCol ? aiCol[i] : pFKey->aCol[0].iFrom;
 		assert(iCol >= 0);
@@ -671,10 +673,9 @@ fkScanChildren(Parse * pParse,	/* Parse context */
 		Expr *pEq, *pAll = 0;
 		Index *pPk = sqlite3PrimaryKeyIndex(pTab);
 		assert(pIdx != 0);
-		int col_count = index_column_count(pPk);
+		int col_count = pPk->def->key_def->part_count;
 		for (i = 0; i < col_count; i++) {
-			i16 iCol = pIdx->aiColumn[i];
-			assert(iCol >= 0);
+			i16 iCol = (int) pIdx->def->key_def->parts[i].fieldno;
 			pLeft = exprTableRegister(pParse, pTab, regData, iCol);
 			pRight =
 				exprTableColumn(db, pTab->def,
@@ -992,7 +993,6 @@ sqlite3FkCheck(Parse * pParse,	/* Parse context */
 			if (aiCol[i] == pTab->iPKey) {
 				aiCol[i] = -1;
 			}
-			assert(pIdx == 0 || pIdx->aiColumn[i] >= 0);
 		}
 
 		pParse->nTab++;
@@ -1126,10 +1126,10 @@ sqlite3FkOldmask(Parse * pParse,	/* Parse context */
 			Index *pIdx = 0;
 			sqlite3FkLocateIndex(pParse, pTab, p, &pIdx, 0);
 			if (pIdx) {
-				int nIdxCol = index_column_count(pIdx);
+				int nIdxCol = pIdx->def->key_def->part_count;
 				for (i = 0; i < nIdxCol; i++) {
-					assert(pIdx->aiColumn[i] >= 0);
-					mask |= COLUMN_MASK(pIdx->aiColumn[i]);
+					mask |= COLUMN_MASK(pIdx->def->
+						key_def->parts[i].fieldno);
 				}
 			}
 		}
@@ -1264,11 +1264,12 @@ fkActionTrigger(Parse * pParse,	/* Parse context */
 			       || (pTab->iPKey >= 0
 				   && pTab->iPKey <
 				      (int)pTab->def->field_count));
-			assert(pIdx == 0 || pIdx->aiColumn[i] >= 0);
+
+			uint32_t fieldno = pIdx != NULL ?
+					     pIdx->def->key_def->parts[i].fieldno
+					   : pTab->iPKey;
 			sqlite3TokenInit(&tToCol,
-					 pTab->def->fields[pIdx ? pIdx->
-						    aiColumn[i] : pTab->iPKey].
-					 name);
+					 pTab->def->fields[fieldno].name);
 			sqlite3TokenInit(&tFromCol,
 					 pFKey->pFrom->def->fields[
 						iFromCol].name);
diff --git a/src/box/sql/insert.c b/src/box/sql/insert.c
index 59c61c703..fc9f85165 100644
--- a/src/box/sql/insert.c
+++ b/src/box/sql/insert.c
@@ -89,7 +89,7 @@ sqlite3IndexAffinityStr(sqlite3 * db, Index * pIdx)
 		 * up.
 		 */
 		int n;
-		int nColumn = index_column_count(pIdx);
+		int nColumn = pIdx->def->key_def->part_count;
 		pIdx->zColAff =
 		    (char *)sqlite3DbMallocRaw(0, nColumn + 1);
 		if (!pIdx->zColAff) {
@@ -97,22 +97,8 @@ sqlite3IndexAffinityStr(sqlite3 * db, Index * pIdx)
 			return 0;
 		}
 		for (n = 0; n < nColumn; n++) {
-			i16 x = pIdx->aiColumn[n];
-			if (x >= 0) {
-				char affinity = pIdx->pTable->
-					def->fields[x].affinity;
-				pIdx->zColAff[n] = affinity;
-			} else {
-				char aff;
-				assert(x == XN_EXPR);
-				assert(pIdx->aColExpr != 0);
-				aff =
-				    sqlite3ExprAffinity(pIdx->aColExpr->a[n].
-							pExpr);
-				if (aff == 0)
-					aff = AFFINITY_BLOB;
-				pIdx->zColAff[n] = aff;
-			}
+			i16 x = pIdx->def->key_def->parts[n].fieldno;
+			pIdx->zColAff[n] = pIdx->pTable->def->fields[x].affinity;
 		}
 		pIdx->zColAff[n] = 0;
 	}
@@ -645,7 +631,7 @@ sqlite3Insert(Parse * pParse,	/* Parser context */
 		     pIdx = pIdx->pNext, i++) {
 			assert(pIdx);
 			aRegIdx[i] = ++pParse->nMem;
-			pParse->nMem += index_column_count(pIdx);
+			pParse->nMem += pIdx->def->key_def->part_count;
 		}
 	}
 
@@ -1088,7 +1074,7 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 	nCol = pTab->def->field_count;
 
 	pPk = sqlite3PrimaryKeyIndex(pTab);
-	nPkField = index_column_count(pPk);
+	nPkField = pPk->def->key_def->part_count;
 
 	/* Record that this module has started */
 	VdbeModuleComment((v, "BEGIN: GenCnstCks(%d,%d,%d,%d,%d)",
@@ -1252,38 +1238,27 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 		 * the insert or update.  Store that record in the aRegIdx[ix] register
 		 */
 		regIdx = aRegIdx[ix] + 1;
-		int nIdxCol = (int)index_column_count(pIdx);
+		int nIdxCol = pIdx->def->key_def->part_count;
 		for (i = 0; i < nIdxCol; i++) {
-			int iField = pIdx->aiColumn[i];
+			int iField = (int) pIdx->def->key_def->parts[i].fieldno;
 			int x;
-			if (iField == XN_EXPR) {
-				pParse->ckBase = regNewData + 1;
-				sqlite3ExprCodeCopy(pParse,
-						    pIdx->aColExpr->a[i].pExpr,
-						    regIdx + i);
-				pParse->ckBase = 0;
-				VdbeComment((v, "%s column %d", pIdx->zName,
-					     i));
-			} else {
-				/* OP_SCopy copies value in separate register,
-				 * which later will be used by OP_NoConflict.
-				 * But OP_NoConflict is necessary only in cases
-				 * when bytecode is needed for proper UNIQUE
-				 * constraint handling.
-				 */
-				if (uniqueByteCodeNeeded) {
-					if (iField == pTab->iPKey)
-						x = regNewData;
-					else
-						x = iField + regNewData + 1;
-
-					assert(iField >= 0);
-					sqlite3VdbeAddOp2(v, OP_SCopy,
-							  x, regIdx + i);
-					VdbeComment((v, "%s",
-						     pTab->def->fields[
-							iField].name));
-				}
+			/* OP_SCopy copies value in separate register,
+			 * which later will be used by OP_NoConflict.
+			 * But OP_NoConflict is necessary only in cases
+			 * when bytecode is needed for proper UNIQUE
+			 * constraint handling.
+			 */
+			if (uniqueByteCodeNeeded) {
+				if (iField == pTab->iPKey)
+					x = regNewData;
+				else
+					x = iField + regNewData + 1;
+
+				assert(iField >= 0);
+				sqlite3VdbeAddOp2(v, OP_SCopy,
+						  x, regIdx + i);
+				VdbeComment((v, "%s",
+					     pTab->def->fields[iField].name));
 			}
 		}
 
@@ -1293,8 +1268,12 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 			/* If PK is marked as INTEGER, use it as strict type,
 			 * not as affinity. Emit code for type checking */
 			if (nIdxCol == 1) {
-				reg_pk = regNewData + 1 + pIdx->aiColumn[0];
-				if (pTab->zColAff[pIdx->aiColumn[0]] ==
+				reg_pk = regNewData + 1 +
+					pIdx->def->key_def->parts[0].fieldno;
+
+				int fieldno = (int)pIdx->def->key_def->
+					parts[0].fieldno;
+				if (pTab->zColAff[fieldno] ==
 				    AFFINITY_INTEGER) {
 					int skip_if_null = sqlite3VdbeMakeLabel(v);
 					if ((pTab->tabFlags & TF_Autoincrement) != 0) {
@@ -1311,8 +1290,8 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 			}
 
 			sqlite3VdbeAddOp3(v, OP_MakeRecord, regNewData + 1,
-					pTab->def->field_count, aRegIdx[ix]);
-			VdbeComment((v, "for %s", pIdx->zName));
+					  pTab->def->field_count, aRegIdx[ix]);
+			VdbeComment((v, "for %s", pIdx->def->name));
 		}
 
 		/* In an UPDATE operation, if this index is the PRIMARY KEY
@@ -1400,7 +1379,7 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 		if (uniqueByteCodeNeeded) {
 			sqlite3VdbeAddOp4Int(v, OP_NoConflict, iThisCur,
 					     addrUniqueOk, regIdx,
-					     index_column_count(pIdx));
+					     pIdx->def->key_def->part_count);
 		}
 		VdbeCoverage(v);
 
@@ -1410,19 +1389,17 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 								 nPkField);
 		if (isUpdate || on_error == ON_CONFLICT_ACTION_REPLACE) {
 			int x;
-			int nPkCol = index_column_count(pPk);
+			int nPkCol = pPk->def->key_def->part_count;
 			/* Extract the PRIMARY KEY from the end of the index entry and
 			 * store it in registers regR..regR+nPk-1
 			 */
 			if (pIdx != pPk) {
 				for (i = 0; i < nPkCol; i++) {
-					assert(pPk->aiColumn[i] >= 0);
-					x = pPk->aiColumn[i];
+					x = pPk->def->key_def->parts[i].fieldno;
 					sqlite3VdbeAddOp3(v, OP_Column,
 							  iThisCur, x, regR + i);
 					VdbeComment((v, "%s.%s", pTab->def->name,
-						pTab->def->fields[
-							pPk->aiColumn[i]].name));
+						pTab->def->fields[x].name));
 				}
 			}
 			if (isUpdate && uniqueByteCodeNeeded) {
@@ -1440,10 +1417,11 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
 					      regIdx : regR);
 
 				for (i = 0; i < nPkCol; i++) {
-					uint32_t id;
-					char *p4 = (char *)sql_index_collation(pPk, i, &id);
-					x = pPk->aiColumn[i];
-					assert(x >= 0);
+					char *p4 = (char *) pPk->def->key_def->parts[i].coll;
+					x = pPk->def->key_def->parts[i].fieldno;
+					if (pPk->tnum==0) {
+						x = -1;
+					}
 					if (i == (nPkCol - 1)) {
 						addrJump = addrUniqueOk;
 						op = OP_Eq;
@@ -1620,8 +1598,8 @@ sqlite3OpenTableAndIndices(Parse * pParse,	/* Parsing context */
 		    IsPrimaryKeyIndex(pIdx) ||		/* Condition 2 */
 		    sqlite3FkReferences(pTab) ||	/* Condition 3 */
 		    /* Condition 4 */
-		    (index_is_unique(pIdx) && pIdx->onError !=
-		     ON_CONFLICT_ACTION_DEFAULT &&
+		    (pIdx->def->opts.is_unique &&
+		     pIdx->onError != ON_CONFLICT_ACTION_DEFAULT &&
 		     /* Condition 4.1 */
 		     pIdx->onError != ON_CONFLICT_ACTION_ABORT) ||
 		     /* Condition 4.2 */
@@ -1639,7 +1617,7 @@ sqlite3OpenTableAndIndices(Parse * pParse,	/* Parsing context */
 						  space_ptr_reg);
 				sql_vdbe_set_p4_key_def(pParse, pIdx);
 				sqlite3VdbeChangeP5(v, p5);
-				VdbeComment((v, "%s", pIdx->zName));
+				VdbeComment((v, "%s", pIdx->def->name));
 			}
 		}
 	}
@@ -1676,35 +1654,23 @@ xferCompatibleIndex(Index * pDest, Index * pSrc)
 	uint32_t i;
 	assert(pDest && pSrc);
 	assert(pDest->pTable != pSrc->pTable);
-	uint32_t nDestCol = index_column_count(pDest);
-	uint32_t nSrcCol = index_column_count(pSrc);
+	uint32_t nDestCol = pDest->def->key_def->part_count;
+	uint32_t nSrcCol = pSrc->def->key_def->part_count;
 	if (nDestCol != nSrcCol) {
 		return 0;	/* Different number of columns */
 	}
 	if (pDest->onError != pSrc->onError) {
 		return 0;	/* Different conflict resolution strategies */
 	}
-	for (i = 0; i < nSrcCol; i++) {
-		if (pSrc->aiColumn[i] != pDest->aiColumn[i]) {
+	struct key_part *src_part = pSrc->def->key_def->parts;
+	struct key_part *dest_part = pDest->def->key_def->parts;
+	for (i = 0; i < nSrcCol; i++, src_part++, dest_part++) {
+		if (src_part->fieldno != dest_part->fieldno)
 			return 0;	/* Different columns indexed */
-		}
-		if (pSrc->aiColumn[i] == XN_EXPR) {
-			assert(pSrc->aColExpr != 0 && pDest->aColExpr != 0);
-			if (sqlite3ExprCompare(pSrc->aColExpr->a[i].pExpr,
-					       pDest->aColExpr->a[i].pExpr,
-					       -1) != 0) {
-				return 0;	/* Different expressions in the index */
-			}
-		}
-		if (sql_index_column_sort_order(pSrc, i) !=
-		    sql_index_column_sort_order(pDest, i)) {
+		if (src_part->sort_order != dest_part->sort_order)
 			return 0;	/* Different sort orders */
-		}
-		uint32_t id;
-		if (sql_index_collation(pSrc, i, &id) !=
-		    sql_index_collation(pDest, i, &id)) {
+		if (src_part->coll != dest_part->coll)
 			return 0;	/* Different collating sequences */
-		}
 	}
 	if (sqlite3ExprCompare(pSrc->pPartIdxWhere, pDest->pPartIdxWhere, -1)) {
 		return 0;	/* Different WHERE clauses */
@@ -1876,16 +1842,14 @@ xferOptimization(Parse * pParse,	/* Parser context */
 		}
 	}
 	for (pDestIdx = pDest->pIndex; pDestIdx; pDestIdx = pDestIdx->pNext) {
-		if (index_is_unique(pDestIdx)) {
+		if (pDestIdx->def->opts.is_unique)
 			destHasUniqueIdx = 1;
-		}
 		for (pSrcIdx = pSrc->pIndex; pSrcIdx; pSrcIdx = pSrcIdx->pNext) {
 			if (xferCompatibleIndex(pDestIdx, pSrcIdx))
 				break;
 		}
-		if (pSrcIdx == 0) {
+		if (pSrcIdx == 0)
 			return 0;	/* pDestIdx has no corresponding index in pSrc */
-		}
 	}
 	/* Get server checks. */
 	ExprList *pCheck_src = space_checks_expr_list(
@@ -1960,11 +1924,11 @@ xferOptimization(Parse * pParse,	/* Parser context */
 		assert(pSrcIdx);
 		emit_open_cursor(pParse, iSrc, pSrcIdx->tnum);
 		sql_vdbe_set_p4_key_def(pParse, pSrcIdx);
-		VdbeComment((v, "%s", pSrcIdx->zName));
+		VdbeComment((v, "%s", pSrcIdx->def->name));
 		emit_open_cursor(pParse, iDest, pDestIdx->tnum);
 		sql_vdbe_set_p4_key_def(pParse, pDestIdx);
 		sqlite3VdbeChangeP5(v, OPFLAG_BULKCSR);
-		VdbeComment((v, "%s", pDestIdx->zName));
+		VdbeComment((v, "%s", pDestIdx->def->name));
 		addr1 = sqlite3VdbeAddOp2(v, OP_Rewind, iSrc, 0);
 		VdbeCoverage(v);
 		sqlite3VdbeAddOp2(v, OP_RowData, iSrc, regData);
diff --git a/src/box/sql/pragma.c b/src/box/sql/pragma.c
index 9dab5a7fd..45896811b 100644
--- a/src/box/sql/pragma.c
+++ b/src/box/sql/pragma.c
@@ -370,8 +370,11 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 						for (k = 1;
 						     k <=
 						     (int)pTab->def->field_count
-						     && pPk->aiColumn[k - 1] !=
-						     i; k++) {
+						     && (int) pPk->def->
+							     key_def->
+							     parts[k - 1].
+							     fieldno != i;
+						     k++) {
 						}
 					}
 					bool nullable =
@@ -430,7 +433,7 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 					size_t avg_tuple_size_idx =
 						sql_index_tuple_size(space, idx);
 					sqlite3VdbeMultiLoad(v, 2, "sii",
-							     pIdx->zName,
+							     pIdx->def->name,
 							     avg_tuple_size_idx,
 							     index_field_tuple_est(pIdx, 0));
 					sqlite3VdbeAddOp2(v, OP_ResultRow, 1,
@@ -459,11 +462,13 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 						 */
 						pParse->nMem = 3;
 					}
-					mx = index_column_count(pIdx);
+					mx = pIdx->def->key_def->part_count;
 					assert(pParse->nMem <=
 					       pPragma->nPragCName);
-					for (i = 0; i < mx; i++) {
-						i16 cnum = pIdx->aiColumn[i];
+					struct key_part *part =
+						pIdx->def->key_def->parts;
+					for (i = 0; i < mx; i++, part++) {
+						i16 cnum = (int) part->fieldno;
 						assert(pIdx->pTable);
 						sqlite3VdbeMultiLoad(v, 1,
 								     "iis", i,
@@ -477,19 +482,18 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 								     name);
 						if (pPragma->iArg) {
 							const char *c_n;
-							uint32_t id;
+							uint32_t id =
+								part->coll_id;
 							struct coll *coll =
-								sql_index_collation(pIdx, i, &id);
+								part->coll;
 							if (coll != NULL)
 								c_n = coll_by_id(id)->name;
 							else
 								c_n = "BINARY";
-							enum sort_order sort_order;
-							sort_order = sql_index_column_sort_order(pIdx,
-												 i);
 							sqlite3VdbeMultiLoad(v,
 									     4,
 									     "isi",
+									     part->
 									     sort_order,
 									     c_n,
 									     i <
@@ -519,10 +523,8 @@ sqlite3Pragma(Parse * pParse, Token * pId,	/* First part of [schema.]id field */
 						    { "c", "u", "pk" };
 						sqlite3VdbeMultiLoad(v, 1,
 								     "isisi", i,
-								     pIdx->
-								     zName,
-								     index_is_unique
-								     (pIdx),
+								     pIdx->def->name,
+								     pIdx->def->opts.is_unique,
 								     azOrigin
 								     [pIdx->
 								      idxType],
diff --git a/src/box/sql/select.c b/src/box/sql/select.c
index 2aa35a114..2646a99c3 100644
--- a/src/box/sql/select.c
+++ b/src/box/sql/select.c
@@ -4291,7 +4291,7 @@ sqlite3IndexedByLookup(Parse * pParse, struct SrcList_item *pFrom)
 		char *zIndexedBy = pFrom->u1.zIndexedBy;
 		Index *pIdx;
 		for (pIdx = pTab->pIndex;
-		     pIdx && strcmp(pIdx->zName, zIndexedBy);
+		     pIdx && strcmp(pIdx->def->name, zIndexedBy);
 		     pIdx = pIdx->pNext) ;
 		if (!pIdx) {
 			sqlite3ErrorMsg(pParse, "no such index: %s", zIndexedBy,
diff --git a/src/box/sql/sqliteInt.h b/src/box/sql/sqliteInt.h
index 01351a183..36b46ed4f 100644
--- a/src/box/sql/sqliteInt.h
+++ b/src/box/sql/sqliteInt.h
@@ -2071,21 +2071,6 @@ struct UnpackedRecord {
  * Each SQL index is represented in memory by an
  * instance of the following structure.
  *
- * The columns of the table that are to be indexed are described
- * by the aiColumn[] field of this structure.  For example, suppose
- * we have the following table and index:
- *
- *     CREATE TABLE Ex1(c1 int, c2 int, c3 text);
- *     CREATE INDEX Ex2 ON Ex1(c3,c1);
- *
- * In the Table structure describing Ex1, nCol==3 because there are
- * three columns in the table.  In the Index structure describing
- * Ex2, nColumn==2 since 2 of the 3 columns of Ex1 are indexed.
- * The value of aiColumn is {2, 0}.  aiColumn[0]==2 because the
- * first column to be indexed (c3) has an index of 2 in Ex1.aCol[].
- * The second column to be indexed (c1) has an index of 0 in
- * Ex1.aCol[], hence Ex2.aiColumn[1]==0.
- *
  * The Index.onError field determines whether or not the indexed columns
  * must be unique and what to do if they are not.  When Index.onError=
  * ON_CONFLICT_ACTION_NONE, it means this is not a unique index.
@@ -2102,27 +2087,19 @@ struct UnpackedRecord {
  * program is executed). See convertToWithoutRowidTable() for details.
  */
 struct Index {
-	char *zName;		/* Name of this index */
-	i16 *aiColumn;		/* Which columns are used by this index.  1st is 0 */
 	LogEst *aiRowLogEst;	/* From ANALYZE: Est. rows selected by each column */
 	Table *pTable;		/* The SQL table being indexed */
 	char *zColAff;		/* String defining the affinity of each column */
 	Index *pNext;		/* The next index associated with the same table */
 	Schema *pSchema;	/* Schema containing this index */
-	/** Sorting order for each column. */
-	enum sort_order *sort_order;
-	/** Array of collation sequences for index. */
-	struct coll **coll_array;
-	/** Array of collation identifiers. */
-	uint32_t *coll_id_array;
 	Expr *pPartIdxWhere;	/* WHERE clause for partial indices */
 	ExprList *aColExpr;	/* Column expressions */
 	int tnum;		/* DB Page containing root of this index */
-	u16 nColumn;		/* Number of columns stored in the index */
 	u8 onError;		/* ON_CONFLICT_ACTION_ABORT, _IGNORE, _REPLACE,
 				 * or _NONE
 				 */
 	unsigned idxType:2;	/* 1==UNIQUE, 2==PRIMARY KEY, 0==CREATE INDEX */
+	struct index_def *def;
 };
 
 /**
@@ -2161,11 +2138,6 @@ index_field_tuple_est(struct Index *idx, uint32_t field);
 #define IsUniqueIndex(X)      (((X)->idxType == SQLITE_IDXTYPE_UNIQUE) || \
 				((X)->idxType == SQLITE_IDXTYPE_PRIMARYKEY))
 
-/* The Index.aiColumn[] values are normally positive integer.  But
- * there are some negative values that have special meaning:
- */
-#define XN_EXPR      (-2)	/* Indexed column is an expression */
-
 #ifdef DEFAULT_TUPLE_COUNT
 #undef DEFAULT_TUPLE_COUNT
 #endif
@@ -3526,37 +3498,10 @@ void sqlite3AddCollateType(Parse *, Token *);
  */
 struct coll *
 sql_column_collation(struct space_def *def, uint32_t column, uint32_t *coll_id);
-/**
- * Return name of given column collation from index.
- *
- * @param idx Index which is used to fetch column.
- * @param column Number of column.
- * @param[out] coll_id Collation identifier.
- * @retval Pointer to collation.
- */
-struct coll *
-sql_index_collation(Index *idx, uint32_t column, uint32_t *id);
+
 bool
 space_is_view(Table *);
 
-/**
- * Return key_def of provided struct Index.
- * @param idx Pointer to `struct Index` object.
- * @retval Pointer to `struct key_def`.
- */
-struct key_def*
-sql_index_key_def(struct Index *idx);
-
-/**
- * Return sort order of given column from index.
- *
- * @param idx Index which is used to fetch column.
- * @param column Number of column.
- * @retval Sort order of requested column.
- */
-enum sort_order
-sql_index_column_sort_order(Index *idx, uint32_t column);
-
 void sqlite3EndTable(Parse *, Token *, Token *, Select *);
 int
 emit_open_cursor(Parse *, int, int);
@@ -3607,8 +3552,6 @@ void sqlite3SrcListAssignCursors(Parse *, SrcList *);
 void sqlite3IdListDelete(sqlite3 *, IdList *);
 void sqlite3SrcListDelete(sqlite3 *, SrcList *);
 Index *sqlite3AllocateIndexObject(sqlite3 *, i16, int, char **);
-bool
-index_is_unique(Index *);
 
 /**
  * Create a new index for an SQL table.  name is the name of the
@@ -4293,8 +4236,6 @@ int sqlite3InvokeBusyHandler(BusyHandler *);
 int
 sql_analysis_load(struct sqlite3 *db);
 
-uint32_t
-index_column_count(const Index *);
 bool
 index_is_unique_not_null(const Index *);
 void sqlite3RegisterLikeFunctions(sqlite3 *, int);
diff --git a/src/box/sql/trigger.c b/src/box/sql/trigger.c
index e1126b2d2..ea3521133 100644
--- a/src/box/sql/trigger.c
+++ b/src/box/sql/trigger.c
@@ -872,8 +872,6 @@ codeRowTrigger(Parse * pParse,	/* Current parse context */
 	pSubParse->pToplevel = pTop;
 	pSubParse->eTriggerOp = pTrigger->op;
 	pSubParse->nQueryLoop = pParse->nQueryLoop;
-	struct region *region = &fiber()->gc;
-	pSubParse->region_initial_size = region_used(region);
 
 	v = sqlite3GetVdbe(pSubParse);
 	if (v) {
diff --git a/src/box/sql/update.c b/src/box/sql/update.c
index 590aad28b..6545b3b06 100644
--- a/src/box/sql/update.c
+++ b/src/box/sql/update.c
@@ -237,14 +237,14 @@ sqlite3Update(Parse * pParse,		/* The parser context */
 	 */
 	for (j = 0, pIdx = pTab->pIndex; pIdx; pIdx = pIdx->pNext, j++) {
 		int reg;
-		int nIdxCol = index_column_count(pIdx);
+		int nIdxCol = pIdx->def->key_def->part_count;
 		if (chngPk || hasFK || pIdx->pPartIdxWhere || pIdx == pPk) {
 			reg = ++pParse->nMem;
 			pParse->nMem += nIdxCol;
 		} else {
 			reg = 0;
 			for (i = 0; i < nIdxCol; i++) {
-				i16 iIdxCol = pIdx->aiColumn[i];
+				i16 iIdxCol = pIdx->def->key_def->parts[i].fieldno;
 				if (iIdxCol < 0 || aXRef[iIdxCol] >= 0) {
 					reg = ++pParse->nMem;
 					pParse->nMem += nIdxCol;
@@ -306,7 +306,7 @@ sqlite3Update(Parse * pParse,		/* The parser context */
 		nPk = nKey;
 	} else {
 		assert(pPk != 0);
-		nPk = index_column_count(pPk);
+		nPk = pPk->def->key_def->part_count;
 	}
 	iPk = pParse->nMem + 1;
 	pParse->nMem += nPk;
@@ -333,9 +333,9 @@ sqlite3Update(Parse * pParse,		/* The parser context */
 		}
 	} else {
 		for (i = 0; i < nPk; i++) {
-			assert(pPk->aiColumn[i] >= 0);
 			sqlite3ExprCodeGetColumnOfTable(v, pTab->def, iDataCur,
-							pPk->aiColumn[i],
+							pPk->def->key_def->
+								parts[i].fieldno,
 							iPk + i);
 		}
 	}
diff --git a/src/box/sql/vdbeaux.c b/src/box/sql/vdbeaux.c
index 679bd0bc1..520b309d9 100644
--- a/src/box/sql/vdbeaux.c
+++ b/src/box/sql/vdbeaux.c
@@ -1165,7 +1165,7 @@ sql_vdbe_set_p4_key_def(struct Parse *parse, struct Index *idx)
 	struct Vdbe *v = parse->pVdbe;
 	assert(v != NULL);
 	assert(idx != NULL);
-	struct key_def *def = key_def_dup(sql_index_key_def(idx));
+	struct key_def *def = key_def_dup(idx->def->key_def);
 	if (def == NULL)
 		sqlite3OomFault(parse->db);
 	else
diff --git a/src/box/sql/vdbemem.c b/src/box/sql/vdbemem.c
index f408b7701..51b5d516e 100644
--- a/src/box/sql/vdbemem.c
+++ b/src/box/sql/vdbemem.c
@@ -1087,7 +1087,7 @@ valueNew(sqlite3 * db, struct ValueNewStat4Ctx *p)
 			Index *pIdx = p->pIdx;	/* Index being probed */
 			int nByte;	/* Bytes of space to allocate */
 			int i;	/* Counter variable */
-			int nCol = index_column_count(pIdx);
+			int nCol = pIdx->def->key_def->part_count;
 
 			nByte = sizeof(Mem) * nCol +
 				ROUND8(sizeof(UnpackedRecord));
@@ -1095,7 +1095,7 @@ valueNew(sqlite3 * db, struct ValueNewStat4Ctx *p)
 			    (UnpackedRecord *) sqlite3DbMallocZero(db, nByte);
 			if (pRec == NULL)
 				return NULL;
-			pRec->key_def = key_def_dup(sql_index_key_def(pIdx));
+			pRec->key_def = key_def_dup(pIdx->def->key_def);
 			if (pRec->key_def == NULL) {
 				sqlite3DbFree(db, pRec);
 				sqlite3OomFault(db);
diff --git a/src/box/sql/where.c b/src/box/sql/where.c
index e79164781..9f5de50f9 100644
--- a/src/box/sql/where.c
+++ b/src/box/sql/where.c
@@ -265,11 +265,6 @@ whereScanNext(WhereScan * pScan)
 			for (pTerm = pWC->a + k; k < pWC->nTerm; k++, pTerm++) {
 				if (pTerm->leftCursor == iCur
 				    && pTerm->u.leftColumn == iColumn
-				    && (iColumn != XN_EXPR
-					|| sqlite3ExprCompare(pTerm->pExpr->
-							      pLeft,
-							      pScan->pIdxExpr,
-							      iCur) == 0)
 				    && (pScan->iEquiv <= 1
 					|| !ExprHasProperty(pTerm->pExpr,
 							    EP_FromJoin))
@@ -376,19 +371,21 @@ whereScanInit(WhereScan * pScan,	/* The WhereScan object being initialized */
 	pScan->is_column_seen = false;
 	if (pIdx) {
 		int j = iColumn;
-		iColumn = pIdx->aiColumn[j];
-		if (iColumn == XN_EXPR) {
-			pScan->pIdxExpr = pIdx->aColExpr->a[j].pExpr;
-		} else if (iColumn >= 0) {
+		iColumn = pIdx->def->key_def->parts[j].fieldno;
+		/*
+		 * pIdx->tnum == 0 means that pIdx is a fake integer
+		 * primary key index
+		 */
+		if (pIdx->tnum == 0)
+			iColumn = -1;
+
+		if (iColumn >= 0) {
 			char affinity =
 				pIdx->pTable->def->fields[iColumn].affinity;
 			pScan->idxaff = affinity;
-			uint32_t id;
-			pScan->coll = sql_index_collation(pIdx, j, &id);
+			pScan->coll = pIdx->def->key_def->parts[j].coll;
 			pScan->is_column_seen = true;
 		}
-	} else if (iColumn == XN_EXPR) {
-		return 0;
 	}
 	pScan->opMask = opMask;
 	pScan->k = 0;
@@ -464,18 +461,17 @@ findIndexCol(Parse * pParse,	/* Parse context */
 	     Index * pIdx,	/* Index to match column of */
 	     int iCol)		/* Column of index to match */
 {
+	struct key_part *part_to_match = &pIdx->def->key_def->parts[iCol];
 	for (int i = 0; i < pList->nExpr; i++) {
 		Expr *p = sqlite3ExprSkipCollate(pList->a[i].pExpr);
-		if (p->op == TK_COLUMN &&
-		    p->iColumn == pIdx->aiColumn[iCol] &&
-		    p->iTable == iBase) {
+		if (p->op == TK_COLUMN && p->iTable == iBase &&
+		    p->iColumn == (int) part_to_match->fieldno) {
 			bool is_found;
 			uint32_t id;
 			struct coll *coll = sql_expr_coll(pParse,
 							  pList->a[i].pExpr,
 							  &is_found, &id);
-			if (is_found &&
-			    coll == sql_index_collation(pIdx, iCol, &id)) {
+			if (is_found && coll == part_to_match->coll) {
 				return i;
 			}
 		}
@@ -484,27 +480,6 @@ findIndexCol(Parse * pParse,	/* Parse context */
 	return -1;
 }
 
-/*
- * Return TRUE if the iCol-th column of index pIdx is NOT NULL
- */
-static int
-indexColumnNotNull(Index * pIdx, int iCol)
-{
-	int j;
-	assert(pIdx != 0);
-	assert(iCol >= 0 && iCol < (int)index_column_count(pIdx));
-	j = pIdx->aiColumn[iCol];
-	if (j >= 0) {
-		return !pIdx->pTable->def->fields[j].is_nullable;
-	} else if (j == (-1)) {
-		return 1;
-	} else {
-		assert(j == (-2));
-		return 0;	/* Assume an indexed expression can always yield a NULL */
-
-	}
-}
-
 /*
  * Return true if the DISTINCT expression-list passed as the third argument
  * is redundant.
@@ -556,9 +531,9 @@ isDistinctRedundant(Parse * pParse,		/* Parsing context */
 	 *      contain a "col=X" term are subject to a NOT NULL constraint.
 	 */
 	for (pIdx = pTab->pIndex; pIdx; pIdx = pIdx->pNext) {
-		if (!index_is_unique(pIdx))
+		if (!pIdx->def->opts.is_unique)
 			continue;
-		int col_count = index_column_count(pIdx);
+		int col_count = pIdx->def->key_def->part_count;
 		for (i = 0; i < col_count; i++) {
 			if (0 ==
 			    sqlite3WhereFindTerm(pWC, iBase, i, ~(Bitmask) 0,
@@ -566,11 +541,12 @@ isDistinctRedundant(Parse * pParse,		/* Parsing context */
 				if (findIndexCol
 				    (pParse, pDistinct, iBase, pIdx, i) < 0)
 					break;
-				if (indexColumnNotNull(pIdx, i) == 0)
+				uint32_t j = pIdx->def->key_def->parts[i].fieldno;
+				if (!pIdx->pTable->def->fields[j].is_nullable == 0)
 					break;
 			}
 		}
-		if (i == (int)index_column_count(pIdx)) {
+		if (i == (int) pIdx->def->key_def->part_count) {
 			/* This index implies that the DISTINCT qualifier is redundant. */
 			return 1;
 		}
@@ -1107,7 +1083,7 @@ whereRangeAdjust(WhereTerm * pTerm, LogEst nNew)
 char
 sqlite3IndexColumnAffinity(sqlite3 * db, Index * pIdx, int iCol)
 {
-	assert(iCol >= 0 && iCol < (int)index_column_count(pIdx));
+	assert(iCol >= 0 && iCol < (int) pIdx->def->key_def->part_count);
 	if (!pIdx->zColAff) {
 		if (sqlite3IndexAffinityStr(db, pIdx) == 0)
 			return AFFINITY_BLOB;
@@ -1169,13 +1145,12 @@ whereRangeSkipScanEst(Parse * pParse,		/* Parsing & code generating context */
 	int nUpper = index->def->opts.stat->sample_count + 1;
 	int rc = SQLITE_OK;
 	u8 aff = sqlite3IndexColumnAffinity(db, p, nEq);
-	uint32_t id;
 
 	sqlite3_value *p1 = 0;	/* Value extracted from pLower */
 	sqlite3_value *p2 = 0;	/* Value extracted from pUpper */
 	sqlite3_value *pVal = 0;	/* Value extracted from record */
 
-	struct coll *pColl = sql_index_collation(p, nEq, &id);
+	struct coll *pColl = p->def->key_def->parts[nEq].coll;
 	if (pLower) {
 		rc = sqlite3Stat4ValueFromExpr(pParse, pLower->pExpr->pRight,
 					       aff, &p1);
@@ -1371,7 +1346,7 @@ whereRangeScanEst(Parse * pParse,	/* Parsing & code generating context */
 			       || (pLower->eOperator & (WO_GT | WO_GE)) != 0);
 			assert(pUpper == 0
 			       || (pUpper->eOperator & (WO_LT | WO_LE)) != 0);
-			if (sql_index_column_sort_order(p, nEq) !=
+			if (p->def->key_def->parts[nEq].sort_order !=
 			    SORT_ORDER_ASC) {
 				/* The roles of pLower and pUpper are swapped for a DESC index */
 				SWAP(pLower, pUpper);
@@ -1521,7 +1496,7 @@ whereEqualScanEst(Parse * pParse,	/* Parsing & code generating context */
 	int bOk;
 
 	assert(nEq >= 1);
-	assert(nEq <= (int)index_column_count(p));
+	assert(nEq <= (int) p->def->key_def->part_count);
 	assert(pBuilder->nRecValid < nEq);
 
 	/* If values are not available for all fields of the index to the left
@@ -1542,7 +1517,7 @@ whereEqualScanEst(Parse * pParse,	/* Parsing & code generating context */
 
 	whereKeyStats(pParse, p, pRec, 0, a);
 	WHERETRACE(0x10, ("equality scan regions %s(%d): %d\n",
-			  p->zName, nEq - 1, (int)a[1]));
+			  p->def->name, nEq - 1, (int)a[1]));
 	*pnRow = a[1];
 
 	return rc;
@@ -1674,7 +1649,7 @@ whereLoopPrint(WhereLoop * p, WhereClause * pWC)
 			   pItem->zAlias ? pItem->zAlias : pTab->def->name);
 #endif
 	const char *zName;
-	if (p->pIndex && (zName = p->pIndex->zName) != 0) {
+	if (p->pIndex && (zName = p->pIndex->def->name) != 0) {
 		if (strncmp(zName, "sqlite_autoindex_", 17) == 0) {
 			int i = sqlite3Strlen30(zName) - 1;
 			while (zName[i] != '_')
@@ -2236,7 +2211,7 @@ whereRangeVectorLen(Parse * pParse,	/* Parsing context */
 	int nCmp = sqlite3ExprVectorSize(pTerm->pExpr->pLeft);
 	int i;
 
-	nCmp = MIN(nCmp, (int)(index_column_count(pIdx) - nEq));
+	nCmp = MIN(nCmp, (int)(pIdx->def->key_def->part_count - nEq));
 	for (i = 1; i < nCmp; i++) {
 		/* Test if comparison i of pTerm is compatible with column (i+nEq)
 		 * of the index. If not, exit the loop.
@@ -2257,11 +2232,10 @@ whereRangeVectorLen(Parse * pParse,	/* Parsing context */
 		 * order of the index column is the same as the sort order of the
 		 * leftmost index column.
 		 */
-		if (pLhs->op != TK_COLUMN
-		    || pLhs->iTable != iCur
-		    || pLhs->iColumn != pIdx->aiColumn[i + nEq]
-		    || sql_index_column_sort_order(pIdx, i + nEq) !=
-		       sql_index_column_sort_order(pIdx, nEq)) {
+		if (pLhs->op != TK_COLUMN || pLhs->iTable != iCur
+		    || pLhs->iColumn != (int)pIdx->def->key_def->parts[i + nEq].fieldno
+		    || pIdx->def->key_def->parts[i + nEq].sort_order !=
+		       pIdx->def->key_def->parts[nEq].sort_order) {
 			break;
 		}
 
@@ -2275,7 +2249,7 @@ whereRangeVectorLen(Parse * pParse,	/* Parsing context */
 		pColl = sql_binary_compare_coll_seq(pParse, pLhs, pRhs, &id);
 		if (pColl == 0)
 			break;
-	        if (sql_index_collation(pIdx, i + nEq, &id) != pColl)
+		if (pIdx->def->key_def->parts[(i + nEq)].coll != pColl)
 			break;
 	}
 	return i;
@@ -2318,13 +2292,13 @@ whereLoopAddBtreeIndex(WhereLoopBuilder * pBuilder,	/* The WhereLoop factory */
 	LogEst rSize;		/* Number of rows in the table */
 	LogEst rLogSize;	/* Logarithm of table size */
 	WhereTerm *pTop = 0, *pBtm = 0;	/* Top and bottom range constraints */
-	uint32_t nProbeCol = index_column_count(pProbe);
+	uint32_t nProbeCol = pProbe->def->key_def->part_count;
 
 	pNew = pBuilder->pNew;
 	if (db->mallocFailed)
 		return SQLITE_NOMEM_BKPT;
 	WHERETRACE(0x800, ("BEGIN addBtreeIdx(%s), nEq=%d\n",
-			   pProbe->zName, pNew->nEq));
+			   pProbe->def->name, pNew->nEq));
 
 	assert((pNew->wsFlags & WHERE_TOP_LIMIT) == 0);
 	if (pNew->wsFlags & WHERE_BTM_LIMIT) {
@@ -2374,8 +2348,9 @@ whereLoopAddBtreeIndex(WhereLoopBuilder * pBuilder,	/* The WhereLoop factory */
 		LogEst nOutUnadjusted;	/* nOut before IN() and WHERE adjustments */
 		int nIn = 0;
 		int nRecValid = pBuilder->nRecValid;
+		uint32_t j = pProbe->def->key_def->parts[saved_nEq].fieldno;
 		if ((eOp == WO_ISNULL || (pTerm->wtFlags & TERM_VNULL) != 0)
-		    && indexColumnNotNull(pProbe, saved_nEq)
+		    && !pProbe->pTable->def->fields[j].is_nullable
 		    ) {
 			continue;	/* ignore IS [NOT] NULL constraints on NOT NULL columns */
 		}
@@ -2445,14 +2420,16 @@ whereLoopAddBtreeIndex(WhereLoopBuilder * pBuilder,	/* The WhereLoop factory */
 							 */
 			}
 		} else if (eOp & WO_EQ) {
-			int iCol = pProbe->aiColumn[saved_nEq];
+			int iCol = pProbe->def->key_def->parts[saved_nEq].fieldno;
 			pNew->wsFlags |= WHERE_COLUMN_EQ;
 			assert(saved_nEq == pNew->nEq);
-			if ((iCol > 0 && nInMul == 0
-				&& saved_nEq == nProbeCol - 1)
-			    ) {
-				if (iCol >= 0 &&
-				    !index_is_unique_not_null(pProbe)) {
+			if ((iCol > 0 && nInMul == 0 &&
+			     saved_nEq == nProbeCol - 1)) {
+				bool index_is_unique_not_null =
+					pProbe->def->key_def->is_nullable &&
+					pProbe->def->opts.is_unique;
+				if (pProbe->tnum != 0 &&
+				    !index_is_unique_not_null) {
 					pNew->wsFlags |= WHERE_UNQ_WANTED;
 				} else {
 					pNew->wsFlags |= WHERE_ONEROW;
@@ -2514,8 +2491,7 @@ whereLoopAddBtreeIndex(WhereLoopBuilder * pBuilder,	/* The WhereLoop factory */
 			assert(eOp & (WO_ISNULL | WO_EQ | WO_IN));
 
 			assert(pNew->nOut == saved_nOut);
-			if (pTerm->truthProb <= 0
-			    && pProbe->aiColumn[saved_nEq] >= 0) {
+			if (pTerm->truthProb <= 0 && pProbe->tnum != 0 ) {
 				assert((eOp & WO_IN) || nIn == 0);
 				testcase(eOp & WO_IN);
 				pNew->nOut += pTerm->truthProb;
@@ -2671,7 +2647,7 @@ whereLoopAddBtreeIndex(WhereLoopBuilder * pBuilder,	/* The WhereLoop factory */
 	}
 
 	WHERETRACE(0x800, ("END addBtreeIdx(%s), nEq=%d, rc=%d\n",
-			   pProbe->zName, saved_nEq, rc));
+			   pProbe->def->name, saved_nEq, rc));
 	return rc;
 }
 
@@ -2715,7 +2691,7 @@ indexMightHelpWithOrderBy(WhereLoopBuilder * pBuilder,
 	ExprList *pOB;
 	ExprList *aColExpr;
 	int ii, jj;
-	int nIdxCol = index_column_count(pIndex);
+	int nIdxCol = pIndex->def->key_def->part_count;
 	if (index_is_unordered(pIndex))
 		return 0;
 	if ((pOB = pBuilder->pWInfo->pOrderBy) == 0)
@@ -2726,13 +2702,12 @@ indexMightHelpWithOrderBy(WhereLoopBuilder * pBuilder,
 			if (pExpr->iColumn < 0)
 				return 1;
 			for (jj = 0; jj < nIdxCol; jj++) {
-				if (pExpr->iColumn == pIndex->aiColumn[jj])
+				if (pExpr->iColumn == (int)
+				    pIndex->def->key_def->parts[jj].fieldno)
 					return 1;
 			}
 		} else if ((aColExpr = pIndex->aColExpr) != 0) {
 			for (jj = 0; jj < nIdxCol; jj++) {
-				if (pIndex->aiColumn[jj] != XN_EXPR)
-					continue;
 				if (sqlite3ExprCompare
 				    (pExpr, aColExpr->a[jj].pExpr,
 				     iCursor) == 0) {
@@ -2815,7 +2790,6 @@ whereLoopAddBtree(WhereLoopBuilder * pBuilder,	/* WHERE clause information */
 	Index *pProbe;		/* An index we are evaluating */
 	Index sPk;		/* A fake index object for the primary key */
 	LogEst aiRowEstPk[2];	/* The aiRowLogEst[] value for the sPk index */
-	i16 aiColumnPk = -1;	/* The aColumn[] value for the sPk index */
 	SrcList *pTabList;	/* The FROM clause */
 	struct SrcList_item *pSrc;	/* The FROM clause btree term to add */
 	WhereLoop *pNew;	/* Template WhereLoop object */
@@ -2846,11 +2820,27 @@ whereLoopAddBtree(WhereLoopBuilder * pBuilder,	/* WHERE clause information */
 		 */
 		Index *pFirst;	/* First of real indices on the table */
 		memset(&sPk, 0, sizeof(Index));
-		sPk.nColumn = 1;
-		sPk.aiColumn = &aiColumnPk;
 		sPk.aiRowLogEst = aiRowEstPk;
 		sPk.onError = ON_CONFLICT_ACTION_REPLACE;
 		sPk.pTable = pTab;
+
+		struct key_def *key_def = key_def_new(1);
+		if (key_def == NULL)
+			return SQLITE_ERROR;
+
+		key_def_set_part(key_def, 0, 0, pTab->def->fields[0].type,
+				 ON_CONFLICT_ACTION_ABORT,
+				 NULL, COLL_NONE, SORT_ORDER_ASC);
+
+		struct index_opts index_opts = index_opts_default;
+
+		sPk.def = index_def_new(pTab->def->id, 0, "primary",
+					sizeof("primary") - 1, TREE, &index_opts,
+					key_def, NULL);
+
+		if (sPk.def == NULL)
+			return SQLITE_ERROR;
+
 		aiRowEstPk[0] = sql_space_tuple_log_count(pTab);
 		aiRowEstPk[1] = 0;
 		pFirst = pSrc->pTab->pIndex;
@@ -3325,8 +3315,8 @@ wherePathSatisfiesOrderBy(WhereInfo * pWInfo,	/* The WHERE clause */
 				   index_is_unordered(pIndex)) {
 				return 0;
 			} else {
-				nColumn = index_column_count(pIndex);
-				isOrderDistinct = index_is_unique(pIndex);
+				nColumn = pIndex->def->key_def->part_count;
+				isOrderDistinct = pIndex->def->opts.is_unique;
 			}
 
 			/* Loop through all columns of the index and deal with the ones
@@ -3387,9 +3377,10 @@ wherePathSatisfiesOrderBy(WhereInfo * pWInfo,	/* The WHERE clause */
 				 * (revIdx) for the j-th column of the index.
 				 */
 				if (pIndex) {
-					iColumn = pIndex->aiColumn[j];
-					revIdx = sql_index_column_sort_order(pIndex,
-									     j);
+					iColumn = pIndex->def->key_def->
+						parts[j].fieldno;
+					revIdx = pIndex->def->key_def->
+						parts[j].sort_order;
 					if (iColumn == pIndex->pTable->iPKey)
 						iColumn = -1;
 				} else {
@@ -3442,8 +3433,7 @@ wherePathSatisfiesOrderBy(WhereInfo * pWInfo,	/* The WHERE clause */
 								      pOrderBy->a[i].pExpr,
 								      &is_found, &id);
 						struct coll *idx_coll =
-							sql_index_collation(pIndex,
-									    j, &id);
+							pIndex->def->key_def->parts[j].coll;
 						if (is_found &&
 						    coll != idx_coll)
 							continue;
@@ -4105,13 +4095,13 @@ whereShortCut(WhereLoopBuilder * pBuilder)
 	} else {
 		for (pIdx = pTab->pIndex; pIdx; pIdx = pIdx->pNext) {
 			int opMask;
-			int nIdxCol = index_column_count(pIdx);
+			int nIdxCol = pIdx->def->key_def->part_count;
 			assert(pLoop->aLTermSpace == pLoop->aLTerm);
-			if (!index_is_unique(pIdx)
+			if (!pIdx->def->opts.is_unique
 			    || pIdx->pPartIdxWhere != 0
-			    || nIdxCol > ArraySize(pLoop->aLTermSpace)
-			    )
+			    || nIdxCol > ArraySize(pLoop->aLTermSpace)) {
 				continue;
+			}
 			opMask = WO_EQ;
 			for (j = 0; j < nIdxCol; j++) {
 				pTerm =
@@ -4650,7 +4640,7 @@ sqlite3WhereBegin(Parse * pParse,	/* The parser context */
 					wctrlFlags & WHERE_ORDERBY_MIN) == 0) {
 					sqlite3VdbeChangeP5(v, OPFLAG_SEEKEQ);	/* Hint to COMDB2 */
 				}
-				VdbeComment((v, "%s", pIx->zName));
+				VdbeComment((v, "%s", pIx->def->name));
 #ifdef SQLITE_ENABLE_COLUMN_USED_MASK
 				{
 					u64 colUsed = 0;
@@ -4781,7 +4771,7 @@ sqlite3WhereEnd(WhereInfo * pWInfo)
 		if (pLevel->addrSkip) {
 			sqlite3VdbeGoto(v, pLevel->addrSkip);
 			VdbeComment((v, "next skip-scan on %s",
-				     pLoop->pIndex->zName));
+				     pLoop->pIndex->def->name));
 			sqlite3VdbeJumpHere(v, pLevel->addrSkip);
 			sqlite3VdbeJumpHere(v, pLevel->addrSkip - 2);
 		}
diff --git a/src/box/sql/wherecode.c b/src/box/sql/wherecode.c
index 09b267194..22bb76013 100644
--- a/src/box/sql/wherecode.c
+++ b/src/box/sql/wherecode.c
@@ -47,9 +47,7 @@
 static const char *
 explainIndexColumnName(Index * pIdx, int i)
 {
-	i = pIdx->aiColumn[i];
-	if (i == XN_EXPR)
-		return "<expr>";
+	i = pIdx->def->key_def->parts[i].fieldno;
 	return pIdx->pTable->def->fields[i].name;
 }
 
@@ -222,7 +220,7 @@ sqlite3WhereExplainOneScan(Parse * pParse,	/* Parse context */
 			}
 			if (zFmt) {
 				sqlite3StrAccumAppend(&str, " USING ", 7);
-				sqlite3XPrintf(&str, zFmt, pIdx->zName);
+				sqlite3XPrintf(&str, zFmt, pIdx->def->name);
 				explainIndexRange(&str, pLoop);
 			}
 		} else if ((flags & WHERE_IPK) != 0
@@ -463,7 +461,7 @@ codeEqualityTerm(Parse * pParse,	/* The parsing context */
 		int *aiMap = 0;
 
 		if (pLoop->pIndex != 0 &&
-		    sql_index_column_sort_order(pLoop->pIndex, iEq)) {
+		    pLoop->pIndex->def->key_def->parts[iEq].sort_order) {
 			testcase(iEq == 0);
 			testcase(bRev);
 			bRev = !bRev;
@@ -708,7 +706,7 @@ codeAllEqualityTerms(Parse * pParse,	/* Parsing context */
 		sqlite3VdbeAddOp1(v, (bRev ? OP_Last : OP_Rewind), iIdxCur);
 		VdbeCoverageIf(v, bRev == 0);
 		VdbeCoverageIf(v, bRev != 0);
-		VdbeComment((v, "begin skip-scan on %s", pIdx->zName));
+		VdbeComment((v, "begin skip-scan on %s", pIdx->def->name));
 		j = sqlite3VdbeAddOp0(v, OP_Goto);
 		pLevel->addrSkip =
 		    sqlite3VdbeAddOp4Int(v, (bRev ? OP_SeekLT : OP_SeekGT),
@@ -718,8 +716,8 @@ codeAllEqualityTerms(Parse * pParse,	/* Parsing context */
 		sqlite3VdbeJumpHere(v, j);
 		for (j = 0; j < nSkip; j++) {
 			sqlite3VdbeAddOp3(v, OP_Column, iIdxCur,
-					  pIdx->aiColumn[j], regBase + j);
-			testcase(pIdx->aiColumn[j] == XN_EXPR);
+					  pIdx->def->key_def->parts[j].fieldno,
+					  regBase + j);
 			VdbeComment((v, "%s", explainIndexColumnName(pIdx, j)));
 		}
 	}
@@ -1245,10 +1243,10 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 		assert(pWInfo->pOrderBy == 0
 		       || pWInfo->pOrderBy->nExpr == 1
 		       || (pWInfo->wctrlFlags & WHERE_ORDERBY_MIN) == 0);
-		int nIdxCol = index_column_count(pIdx);
+		int nIdxCol = pIdx->def->key_def->part_count;
 		if ((pWInfo->wctrlFlags & WHERE_ORDERBY_MIN) != 0
 		    && pWInfo->nOBSat > 0 && (nIdxCol > nEq)) {
-			j = pIdx->aiColumn[nEq];
+			j = pIdx->def->key_def->parts[nEq].fieldno;
 			/* Allow seek for column with `NOT NULL` == false attribute.
 			 * If a column may contain NULL-s, the comparator installed
 			 * by Tarantool is prepared to seek using a NULL value.
@@ -1259,8 +1257,7 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 			 * FYI: entries in an index are ordered as follows:
 			 *      NULL, ... NULL, min_value, ...
 			 */
-			if ((j >= 0 && pIdx->pTable->def->fields[j].is_nullable)
-			    || j == XN_EXPR) {
+			if (pIdx->pTable->def->fields[j].is_nullable) {
 				assert(pLoop->nSkip == 0);
 				bSeekPastNull = 1;
 				nExtraReg = 1;
@@ -1299,17 +1296,15 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 				assert((bRev & ~1) == 0);
 				pLevel->iLikeRepCntr <<= 1;
 				pLevel->iLikeRepCntr |=
-					bRev ^ (sql_index_column_sort_order(pIdx, nEq) ==
+					bRev ^ (pIdx->def->key_def->
+						  parts[nEq].sort_order ==
 						SORT_ORDER_DESC);
 			}
 #endif
 			if (pRangeStart == 0) {
-				j = pIdx->aiColumn[nEq];
-				if ((j >= 0 &&
-				     pIdx->pTable->def->fields[j].is_nullable)||
-				    j == XN_EXPR) {
+				j = pIdx->def->key_def->parts[nEq].fieldno;
+				if (pIdx->pTable->def->fields[j].is_nullable)
 					bSeekPastNull = 1;
-				}
 			}
 		}
 		assert(pRangeEnd == 0
@@ -1320,7 +1315,7 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 		 * start and end terms (pRangeStart and pRangeEnd).
 		 */
 		if ((nEq < nIdxCol &&
-		     bRev == (sql_index_column_sort_order(pIdx, nEq) ==
+		     bRev == (pIdx->def->key_def->parts[nEq].sort_order ==
 			      SORT_ORDER_ASC)) ||
 		    (bRev && nIdxCol == nEq)) {
 			SWAP(pRangeEnd, pRangeStart);
@@ -1386,9 +1381,10 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 		}
 		struct Index *pk = sqlite3PrimaryKeyIndex(pIdx->pTable);
 		assert(pk);
-		int nPkCol = index_column_count(pk);
+		int nPkCol = pk->def->key_def->part_count;
+		uint32_t zero_fieldno = pk->def->key_def->parts[0].fieldno;
 		char affinity =
-			pIdx->pTable->def->fields[pk->aiColumn[0]].affinity;
+			pIdx->pTable->def->fields[zero_fieldno].affinity;
 		if (nPkCol == 1 && affinity == AFFINITY_INTEGER) {
 			/* Right now INTEGER PRIMARY KEY is the only option to
 			 * get Tarantool's INTEGER column type. Need special handling
@@ -1397,7 +1393,8 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 			 */
 			int limit = pRangeStart == NULL ? nEq : nEq + 1;
 			for (int i = 0; i < limit; i++) {
-				if (pIdx->aiColumn[i] == pk->aiColumn[0]) {
+				if (pIdx->def->key_def->parts[i].fieldno ==
+				    zero_fieldno) {
 					/* Here: we know for sure that table has INTEGER
 					   PRIMARY KEY, single column, and Index we're
 					   trying to use for scan contains this column. */
@@ -1506,10 +1503,10 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 			/* pIdx is a covering index.  No need to access the main table. */
 		}  else if (iCur != iIdxCur) {
 			Index *pPk = sqlite3PrimaryKeyIndex(pIdx->pTable);
-			int nPkCol = index_column_count(pPk);
+			int nPkCol = pPk->def->key_def->part_count;
 			int iKeyReg = sqlite3GetTempRange(pParse, nPkCol);
 			for (j = 0; j < nPkCol; j++) {
-				k = pPk->aiColumn[j];
+				k = pPk->def->key_def->parts[j].fieldno;
 				sqlite3VdbeAddOp3(v, OP_Column, iIdxCur, k,
 						  iKeyReg + j);
 			}
@@ -1614,7 +1611,7 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 		 */
 		if ((pWInfo->wctrlFlags & WHERE_DUPLICATES_OK) == 0) {
 			Index *pPk = sqlite3PrimaryKeyIndex(pTab);
-			int nPkCol = index_column_count(pPk);
+			int nPkCol = pPk->def->key_def->part_count;
 			regRowset = pParse->nTab++;
 			sqlite3VdbeAddOp2(v, OP_OpenTEphemeral,
 					  regRowset, nPkCol);
@@ -1718,13 +1715,16 @@ sqlite3WhereCodeOneLoopStart(WhereInfo * pWInfo,	/* Complete information about t
 						int iSet =
 						    ((ii == pOrWc->nTerm - 1) ? -1 : ii);
 						Index *pPk = sqlite3PrimaryKeyIndex (pTab);
-						int nPk = index_column_count(pPk);
+						int nPk = pPk->def->key_def->part_count;
 						int iPk;
 
 						/* Read the PK into an array of temp registers. */
 						r = sqlite3GetTempRange(pParse, nPk);
 						for (iPk = 0; iPk < nPk; iPk++) {
-							int iCol = pPk->aiColumn[iPk];
+							int iCol = pPk->def->
+								key_def->
+								parts[iPk].
+								fieldno;
 							sqlite3ExprCodeGetColumnToReg
 								(pParse, pTab->def,
 								 iCol, iCur,
diff --git a/src/box/sql/whereexpr.c b/src/box/sql/whereexpr.c
index aa6d4524d..40e4e2577 100644
--- a/src/box/sql/whereexpr.c
+++ b/src/box/sql/whereexpr.c
@@ -903,7 +903,6 @@ exprMightBeIndexed(SrcList * pFrom,	/* The FROM clause */
 		   int *piColumn	/* Write the referenced table column number here */
     )
 {
-	Index *pIdx;
 	int i;
 	int iCur;
 
@@ -930,20 +929,6 @@ exprMightBeIndexed(SrcList * pFrom,	/* The FROM clause */
 	for (i = 0; mPrereq > 1; i++, mPrereq >>= 1) {
 	}
 	iCur = pFrom->a[i].iCursor;
-	for (pIdx = pFrom->a[i].pTab->pIndex; pIdx; pIdx = pIdx->pNext) {
-		if (pIdx->aColExpr == 0)
-			continue;
-		for (i = 0; i < pIdx->nColumn; i++) {
-			if (pIdx->aiColumn[i] != XN_EXPR)
-				continue;
-			if (sqlite3ExprCompare
-			    (pExpr, pIdx->aColExpr->a[i].pExpr, iCur) == 0) {
-				*piCur = iCur;
-				*piColumn = XN_EXPR;
-				return 1;
-			}
-		}
-	}
 	return 0;
 }
 
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