[tarantool-patches] Re: [PATCH 2/2] sql: refactor delete routines

[Vladislav Shpilevoy <v.shpilevoy@tarantool.org>]

I pushed some review fixes on the branch as a separate commit.

On 16/05/2018 19:29, Kirill Yukhin wrote:
> Hi Vlad,
> On 16 мая 18:24, Kirill Yukhin wrote:
>> Refactor DELETE FROM statements translation, update
> I've removed one more dead routine. Patch is in the bottom.
> 
> --
> Regards, Kirill Yukhin
> 
> sql: refactor SQL delete routines
> 
> Refactor DELETE FROM statements translation, update
> all live routines according to Tarantool's coding style.
> Use key_def instead of Table* where possible.
> Remove useless index delete routine as well.
> 
> Part of #3235
> ---
>   src/box/sql/build.c     |    6 +-
>   src/box/sql/delete.c    | 1136 ++++++++++++++++-------------------------------
>   src/box/sql/fkey.c      |    3 +-
>   src/box/sql/insert.c    |   26 +-
>   src/box/sql/parse.y     |    2 +-
>   src/box/sql/sqliteInt.h |  206 ++++++++-
>   src/box/sql/trigger.c   |   12 +-
>   src/box/sql/update.c    |    9 +-
>   src/box/sql/vdbe.c      |    6 +-
>   src/box/sql/vdbeaux.c   |    7 +-
>   10 files changed, 619 insertions(+), 794 deletions(-)
> 
> diff --git a/src/box/sql/build.c b/src/box/sql/build.c
> index c96d351..e3aadab 100644
> --- a/src/box/sql/build.c
> +++ b/src/box/sql/build.c
> @@ -2664,10 +2664,10 @@ sqlite3RefillIndex(Parse * pParse, Index * pIndex, int memRootPage)
>   	VdbeCoverage(v);
>   	regRecord = sqlite3GetTempReg(pParse);
>   
> -	sqlite3GenerateIndexKey(pParse, pIndex, iTab, regRecord,
> -				&iPartIdxLabel, 0, 0);
> +	sql_generate_index_key(pParse, pIndex, iTab, regRecord,
> +			       &iPartIdxLabel, 0, 0);
>   	sqlite3VdbeAddOp2(v, OP_SorterInsert, iSorter, regRecord);
> -	sqlite3ResolvePartIdxLabel(pParse, iPartIdxLabel);
> +	sql_resolve_part_idx_label(pParse, iPartIdxLabel);
>   	sqlite3VdbeAddOp2(v, OP_Next, iTab, addr1 + 1);
>   	VdbeCoverage(v);
>   	sqlite3VdbeJumpHere(v, addr1);
> diff --git a/src/box/sql/delete.c b/src/box/sql/delete.c
> index 3455f52..0c77057 100644
> --- a/src/box/sql/delete.c
> +++ b/src/box/sql/delete.c
> @@ -29,593 +29,380 @@
>    * SUCH DAMAGE.
>    */
>   
> -/*
> - * This file contains C code routines that are called by the parser
> - * in order to generate code for DELETE FROM statements.
> - */
> -#include "sqliteInt.h"
>   #include "box/session.h"
> +#include "box/schema.h"
> +#include "sqliteInt.h"
> +#include "tarantoolInt.h"
>   
> -/*
> - * While a SrcList can in general represent multiple tables and subqueries
> - * (as in the FROM clause of a SELECT statement) in this case it contains
> - * the name of a single table, as one might find in an INSERT, DELETE,
> - * or UPDATE statement.  Look up that table in the symbol table and
> - * return a pointer.  Set an error message and return NULL if the table
> - * name is not found or if any other error occurs.
> - *
> - * The following fields are initialized appropriate in pSrc:
> - *
> - *    pSrc->a[0].pTab       Pointer to the Table object
> - *    pSrc->a[0].pIndex     Pointer to the INDEXED BY index, if there is one
> - *
> - */
> -Table *
> -sqlite3SrcListLookup(Parse * pParse, SrcList * pSrc)
> +struct Table *
> +sql_list_lookup_table(struct Parse *parse, SrcList *src_list)
>   {
> -	struct SrcList_item *pItem = pSrc->a;
> -	Table *pTab;
> -	assert(pItem && pSrc->nSrc == 1);
> -	pTab = sqlite3LocateTable(pParse, 0, pItem->zName);
> -	sqlite3DeleteTable(pParse->db, pItem->pTab);
> -	pItem->pTab = pTab;
> -	if (pTab != NULL)
> -		pTab->nTabRef++;
> -	if (sqlite3IndexedByLookup(pParse, pItem))
> -		pTab = NULL;
> -	return pTab;
> +	struct SrcList_item *item = src_list->a;
> +	struct Table *table;
> +	assert(item != NULL && src_list->nSrc == 1);
> +	table = sqlite3LocateTable(parse, 0, item->zName);
> +	sqlite3DeleteTable(parse->db, item->pTab);
> +	item->pTab = table;
> +	if (table != NULL)
> +		table->nTabRef++;
> +	if (sqlite3IndexedByLookup(parse, item))
> +		table = NULL;
> +	return table;
>   }
>   
> -/*
> - * Check to make sure the given table is writable.  If it is not
> - * writable, generate an error message and return 1.  If it is
> - * writable return 0;
> - */
> -int
> -sqlite3IsReadOnly(Parse * pParse, Table * pTab, int viewOk)
> -{
> -	/*
> -	 * A table is not writable if it is a system table
> -	 * (i.e. _sql_stat1), this call is not part of a
> -	 * nested parse. In either case leave an error message in
> -	 * pParse and return non-zero.
> -	 */
> -	if ((pTab->tabFlags & TF_Readonly) != 0 && pParse->nested == 0) {
> -		sqlite3ErrorMsg(pParse, "table %s may not be modified",
> -				pTab->zName);
> -		return 1;
> -	}
> -#ifndef SQLITE_OMIT_VIEW
> -	if (!viewOk && space_is_view(pTab)) {
> -		sqlite3ErrorMsg(pParse, "cannot modify %s because it is a view",
> -				pTab->zName);
> -		return 1;
> -	}
> -#endif
> -	return 0;
> -}
> -
> -#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
> -/*
> - * Evaluate a view and store its result in an ephemeral table.  The
> - * pWhere argument is an optional WHERE clause that restricts the
> - * set of rows in the view that are to be added to the ephemeral table.
> - */
>   void
> -sqlite3MaterializeView(Parse * pParse,	/* Parsing context */
> -		       Table * pView,	/* View definition */
> -		       Expr * pWhere,	/* Optional WHERE clause to be added */
> -		       int iCur)	/* Cursor number for ephemeral table */
> +sql_materialize_view(struct Parse *parse, const char *name, struct Expr *where,
> +		     int cursor)
>   {
> -	SelectDest dest;
> -	Select *pSel;
> -	SrcList *pFrom;
> -	sqlite3 *db = pParse->db;
> -	pWhere = sqlite3ExprDup(db, pWhere, 0);
> -	pFrom = sqlite3SrcListAppend(db, 0, 0);
> -	if (pFrom) {
> -		assert(pFrom->nSrc == 1);
> -		pFrom->a[0].zName = sqlite3DbStrDup(db, pView->zName);
> -		assert(pFrom->a[0].pOn == 0);
> -		assert(pFrom->a[0].pUsing == 0);
> -	}
> -	pSel = sqlite3SelectNew(pParse, 0, pFrom, pWhere, 0, 0, 0,
> -				0, 0, 0);
> -	sqlite3SelectDestInit(&dest, SRT_EphemTab, iCur);
> -	sqlite3Select(pParse, pSel, &dest);
> -	sqlite3SelectDelete(db, pSel);
> -}
> -#endif				/* !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER) */
> -
> -#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT)
> -/*
> - * Generate an expression tree to implement the WHERE, ORDER BY,
> - * and LIMIT/OFFSET portion of DELETE and UPDATE statements.
> - *
> - *     DELETE FROM table_wxyz WHERE a<5 ORDER BY a LIMIT 1;
> - *                            \__________________________/
> - *                               pLimitWhere (pInClause)
> - */
> -Expr *
> -sqlite3LimitWhere(Parse * pParse,	/* The parser context */
> -		  SrcList * pSrc,	/* the FROM clause -- which tables to scan */
> -		  Expr * pWhere,	/* The WHERE clause.  May be null */
> -		  ExprList * pOrderBy,	/* The ORDER BY clause.  May be null */
> -		  Expr * pLimit,	/* The LIMIT clause.  May be null */
> -		  Expr * pOffset,	/* The OFFSET clause.  May be null */
> -		  char *zStmtType	/* Either DELETE or UPDATE.  For err msgs. */
> -    )
> -{
> -	Expr *pWhereRowid = NULL;	/* WHERE rowid .. */
> -	Expr *pInClause = NULL;	/* WHERE rowid IN ( select ) */
> -	Expr *pSelectRowid = NULL;	/* SELECT rowid ... */
> -	ExprList *pEList = NULL;	/* Expression list contaning only pSelectRowid */
> -	SrcList *pSelectSrc = NULL;	/* SELECT rowid FROM x ... (dup of pSrc) */
> -	Select *pSelect = NULL;	/* Complete SELECT tree */
> -
> -	/* Check that there isn't an ORDER BY without a LIMIT clause.
> -	 */
> -	if (pOrderBy && (pLimit == 0)) {
> -		sqlite3ErrorMsg(pParse, "ORDER BY without LIMIT on %s",
> -				zStmtType);
> -		goto limit_where_cleanup;
> -	}
> -
> -	/* We only need to generate a select expression if there
> -	 * is a limit/offset term to enforce.
> -	 */
> -	if (pLimit == 0) {
> -		/* if pLimit is null, pOffset will always be null as well. */
> -		assert(pOffset == 0);
> -		return pWhere;
> +	struct sqlite3 *db = parse->db;
> +	where = sqlite3ExprDup(db, where, 0);
> +	struct SrcList *from = sqlite3SrcListAppend(db, NULL, NULL);
> +	if (from != NULL) {
> +		assert(from->nSrc == 1);
> +		from->a[0].zName = sqlite3DbStrDup(db, name);
> +		assert(from->a[0].pOn == NULL);
> +		assert(from->a[0].pUsing == NULL);
>   	}
> -
> -	/* Generate a select expression tree to enforce the limit/offset
> -	 * term for the DELETE or UPDATE statement.  For example:
> -	 *   DELETE FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
> -	 * becomes:
> -	 *   DELETE FROM table_a WHERE rowid IN (
> -	 *     SELECT rowid FROM table_a WHERE col1=1 ORDER BY col2 LIMIT 1 OFFSET 1
> -	 *   );
> -	 */
> -
> -	pSelectRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0);
> -	if (pSelectRowid == 0)
> -		goto limit_where_cleanup;
> -	pEList = sqlite3ExprListAppend(pParse, 0, pSelectRowid);
> -	if (pEList == 0)
> -		goto limit_where_cleanup;
> -
> -	/* duplicate the FROM clause as it is needed by both the DELETE/UPDATE tree
> -	 * and the SELECT subtree.
> -	 */
> -	pSelectSrc = sqlite3SrcListDup(pParse->db, pSrc, 0);
> -	if (pSelectSrc == 0) {
> -		sqlite3ExprListDelete(pParse->db, pEList);
> -		goto limit_where_cleanup;
> -	}
> -
> -	/* generate the SELECT expression tree. */
> -	pSelect = sqlite3SelectNew(pParse, pEList, pSelectSrc, pWhere, 0, 0,
> -				   pOrderBy, 0, pLimit, pOffset);
> -	if (pSelect == 0)
> -		return 0;
> -
> -	/* now generate the new WHERE rowid IN clause for the DELETE/UDPATE */
> -	pWhereRowid = sqlite3PExpr(pParse, TK_ROW, 0, 0);
> -	pInClause =
> -	    pWhereRowid ? sqlite3PExpr(pParse, TK_IN, pWhereRowid, 0) : 0;
> -	sqlite3PExprAddSelect(pParse, pInClause, pSelect);
> -	return pInClause;
> -
> - limit_where_cleanup:
> -	sql_expr_free(pParse->db, pWhere);
> -	sqlite3ExprListDelete(pParse->db, pOrderBy);
> -	sql_expr_free(pParse->db, pLimit);
> -	sql_expr_free(pParse->db, pOffset);
> -	return 0;
> +	struct Select *select = sqlite3SelectNew(parse, NULL, from, where, NULL,
> +						 NULL, NULL, 0, NULL, NULL);
> +	struct SelectDest dest;
> +	sqlite3SelectDestInit(&dest, SRT_EphemTab, cursor);
> +	sqlite3Select(parse, select, &dest);
> +	sqlite3SelectDelete(db, select);
>   }
> -#endif				/* defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT) */
>   
> -/*
> - * Generate code for a DELETE FROM statement.
> - *
> - *     DELETE FROM table_wxyz WHERE a<5 AND b NOT NULL;
> - *                 \________/       \________________/
> - *                  pTabList              pWhere
> - */
>   void
> -sqlite3DeleteFrom(Parse * pParse,	/* The parser context */
> -		  SrcList * pTabList,	/* The table from which we should delete things */
> -		  Expr * pWhere)	/* The WHERE clause.  May be null */
> +sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
> +		      struct Expr *where)
>   {
> -	Vdbe *v;		/* The virtual database engine */
> -	Table *pTab;		/* The table from which records will be deleted */
> -	int i;			/* Loop counter */
> -	WhereInfo *pWInfo;	/* Information about the WHERE clause */
> -	Index *pIdx;		/* For looping over indices of the table */
> -	int iTabCur;		/* Cursor number for the table */
> -	int iDataCur = 0;	/* VDBE cursor for the canonical data source */
> -	int iIdxCur = 0;	/* Cursor number of the first index */
> -	int nIdx;		/* Number of indices */
> -	sqlite3 *db;		/* Main database structure */
> -	NameContext sNC;	/* Name context to resolve expressions in */
> -	int memCnt = -1;	/* Memory cell used for change counting */
> -	int eOnePass;		/* ONEPASS_OFF or _SINGLE or _MULTI */
> -	int aiCurOnePass[2];	/* The write cursors opened by WHERE_ONEPASS */
> -	u8 *aToOpen = 0;	/* Open cursor iTabCur+j if aToOpen[j] is true */
> -	Index *pPk = 0;		/* The PRIMARY KEY index on the table */
> -	int iPk = 0;		/* First of nPk registers holding PRIMARY KEY value */
> -	i16 nPk;		/* Number of columns in the PRIMARY KEY */
> -	int iKey;		/* Memory cell holding key of row to be deleted */
> -	i16 nKey;		/* Number of memory cells in the row key */
> -	int iEphCur = 0;	/* Ephemeral table holding all primary key values */
> -	int addrBypass = 0;	/* Address of jump over the delete logic */
> -	int addrLoop = 0;	/* Top of the delete loop */
> -	int addrEphOpen = 0;	/* Instruction to open the Ephemeral table */
> -	int bComplex;		/* True if there are triggers or FKs or
> -				 * subqueries in the WHERE clause
> -				 */
> -	struct session *user_session = current_session();
> +	struct sqlite3 *db = parse->db;
> +	if (parse->nErr || db->mallocFailed)
> +		goto delete_from_cleanup;
>   
> -#ifndef SQLITE_OMIT_TRIGGER
> -	int isView;		/* True if attempting to delete from a view */
> -	Trigger *pTrigger;	/* List of table triggers, if required */
> -#endif
> +	assert(tab_list->nSrc == 1);
>   
> -	db = pParse->db;
> -	if (pParse->nErr || db->mallocFailed) {
> +	/* Locate the table which we want to delete.  This table
> +	 * has to be put in an SrcList structure because some of
> +	 * the subroutines we will be calling are designed to work
> +	 * with multiple tables and expect an SrcList* parameter
> +	 * instead of just a Table* parameter.
> +	 */
> +	struct Table *table = sql_list_lookup_table(parse, tab_list);
> +	if (table == NULL)
>   		goto delete_from_cleanup;
> -	}
> -	assert(pTabList->nSrc == 1);
>   
> -	/* Locate the table which we want to delete.  This table has to be
> -	 * put in an SrcList structure because some of the subroutines we
> -	 * will be calling are designed to work with multiple tables and expect
> -	 * an SrcList* parameter instead of just a Table* parameter.
> +	struct space *space = space_by_id(SQLITE_PAGENO_TO_SPACEID(table->tnum));
> +	assert(space != NULL);
> +	/* Figure out if we have any triggers and if the table
> +	 * being deleted from is a view.
>   	 */
> -	pTab = sqlite3SrcListLookup(pParse, pTabList);
> -	if (pTab == 0)
> -		goto delete_from_cleanup;
> +	struct Trigger *trigger_list = sqlite3TriggersExist(table, TK_DELETE,
> +							    NULL, NULL);
>   
> -	/* Figure out if we have any triggers and if the table being
> -	 * deleted from is a view
> +	bool is_view = space->def->opts.is_view;
> +	/* True if there are triggers or FKs or subqueries in the
> +	 * WHERE clause.
>   	 */
> -#ifndef SQLITE_OMIT_TRIGGER
> -	pTrigger = sqlite3TriggersExist(pTab, TK_DELETE, 0, 0);
> -	isView = pTab->pSelect != 0;
> -	bComplex = pTrigger || sqlite3FkRequired(pTab, 0);
> -#else
> -#define pTrigger 0
> -#define isView 0
> -#endif
> -#ifdef SQLITE_OMIT_VIEW
> -#undef isView
> -#define isView 0
> -#endif
> -
> -	/* If pTab is really a view, make sure it has been initialized.
> +	bool is_complex = (trigger_list != NULL) ||
> +			   sqlite3FkRequired(table, 0);
> +
> +	/* If table is really a view, make sure it has been
> +	 * initialized.
>   	 */
> -	if (sqlite3ViewGetColumnNames(pParse, pTab)) {
> +	if (sqlite3ViewGetColumnNames(parse, table))
>   		goto delete_from_cleanup;
> -	}
>   
> -	if (sqlite3IsReadOnly(pParse, pTab, (pTrigger ? 1 : 0))) {
> +	if (is_view && trigger_list == NULL) {
> +		sqlite3ErrorMsg(parse, "cannot modify %s because it is a view",
> +				space->def->name);
>   		goto delete_from_cleanup;
>   	}
> -	assert(!isView || pTrigger);
>   
>   	/* Assign cursor numbers to the table and all its indices.
>   	 */
> -	assert(pTabList->nSrc == 1);
> -	iTabCur = pTabList->a[0].iCursor = pParse->nTab++;
> -	for (nIdx = 0, pIdx = pTab->pIndex; pIdx; pIdx = pIdx->pNext, nIdx++) {
> -		pParse->nTab++;
> -	}
> +	int tab_cursor;
> +	tab_cursor = tab_list->a[0].iCursor = parse->nTab++;
> +	parse->nTab += space->index_count;
>   
> -	/* Begin generating code.
> -	 */
> -	v = sqlite3GetVdbe(pParse);
> -	if (v == 0) {
> +	/* Begin generating code.  */
> +	struct Vdbe *v = sqlite3GetVdbe(parse);
> +	if (v == NULL)
>   		goto delete_from_cleanup;
> -	}
> -	if (pParse->nested == 0)
> -		sqlite3VdbeCountChanges(v);
> -	sql_set_multi_write(pParse, true);
>   
> -	/* If we are trying to delete from a view, realize that view into
> -	 * an ephemeral table.
> -	 */
> -#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
> -	if (isView) {
> -		sqlite3MaterializeView(pParse, pTab, pWhere, iTabCur);
> -		iDataCur = iIdxCur = iTabCur;
> -	}
> -#endif
> +	if (parse->nested == 0)
> +		sqlite3VdbeCountChanges(v);
> +	sql_set_multi_write(parse, true);
>   
> -	/* Resolve the column names in the WHERE clause.
> +	/* If we are trying to delete from a view, realize that
> +	 * view into an ephemeral table.
>   	 */
> -	memset(&sNC, 0, sizeof(sNC));
> -	sNC.pParse = pParse;
> -	sNC.pSrcList = pTabList;
> -	if (sqlite3ResolveExprNames(&sNC, pWhere)) {
> +	if (is_view)
> +		sql_materialize_view(parse, space->def->name, where, tab_cursor);
> +
> +	/* Resolve the column names in the WHERE clause. */
> +	struct NameContext nc;
> +	memset(&nc, 0, sizeof(nc));
> +	nc.pParse = parse;
> +	nc.pSrcList = tab_list;
> +	if (sqlite3ResolveExprNames(&nc, where))
>   		goto delete_from_cleanup;
> -	}
>   
> -	/* Initialize the counter of the number of rows deleted, if
> -	 * we are counting rows.
> +	/* Initialize the counter of the number of rows deleted,
> +	 * if we are counting rows.
>   	 */
> +	int reg_count = -1;
> +	struct session *user_session = current_session();
>   	if (user_session->sql_flags & SQLITE_CountRows) {
> -		memCnt = ++pParse->nMem;
> -		sqlite3VdbeAddOp2(v, OP_Integer, 0, memCnt);
> +		reg_count = ++parse->nMem;
> +		sqlite3VdbeAddOp2(v, OP_Integer, 0, reg_count);
>   	}
> -#ifndef SQLITE_OMIT_TRUNCATE_OPTIMIZATION
> -	/* Special case: A DELETE without a WHERE clause deletes everything.
> -	 * It is easier just to erase the whole table. Prior to version 3.6.5,
> -	 * this optimization caused the row change count (the value returned by
> -	 * API function sqlite3_count_changes) to be set incorrectly.
> +	/* Special case: A DELETE without a WHERE clause deletes
> +	 * everything. It is easier just to erase the whole table.
>   	 */
> -	if (pWhere == 0 && !bComplex
> -#ifdef SQLITE_ENABLE_PREUPDATE_HOOK
> -	    && db->xPreUpdateCallback == 0
> -#endif
> -	    ) {
> -		assert(!isView);
> -
> -		sqlite3VdbeAddOp1(v, OP_Clear, pTab->tnum);
> -
> -		/* Do not start Tarantool's transaction in case of truncate optimization.
> -		   This is workaround until system tables cannot be changes inside a
> -		   transaction (_truncate).  */
> -		pParse->initiateTTrans = false;
> -	} else
> -#endif				/* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
> -	{
> -		u16 wcf =
> -		    WHERE_ONEPASS_DESIRED | WHERE_DUPLICATES_OK |
> -		    WHERE_SEEK_TABLE;
> -		if (sNC.ncFlags & NC_VarSelect)
> -			bComplex = 1;
> -		wcf |= (bComplex ? 0 : WHERE_ONEPASS_MULTIROW);
> -		/* Create an ephemeral table used to hold all primary keys for
> -		 * rows to be deleted. Since VIEW is held in ephemeral table,
> -		 * there is no PK for it, so columns should be loaded manually.
> +	if (where == NULL && !is_complex) {
> +		assert(!is_view);
> +
> +		sqlite3VdbeAddOp1(v, OP_Clear, table->tnum);
> +
> +		/* Do not start Tarantool's transaction in case of
> +		 * truncate optimization. This is workaround until
> +		 * system tables cannot be changes inside a
> +		 * transaction (_truncate).
>   		 */
> -		if (isView) {
> -			nPk = pTab->nCol;
> -			iPk = pParse->nMem + 1;
> -			pParse->nMem += nPk;
> -			iEphCur = pParse->nTab++;
> -			struct key_def *def = key_def_new(nPk);
> -			if (def == NULL) {
> -				sqlite3OomFault(db);
> -				goto delete_from_cleanup;
> -			}
> -			addrEphOpen =
> -				sqlite3VdbeAddOp4(v, OP_OpenTEphemeral, iEphCur,
> -						  nPk, 0, (char*)def, P4_KEYDEF);
> +		parse->initiateTTrans = false;
> +	} else {
> +		uint16_t wcf =
> +			WHERE_ONEPASS_DESIRED | WHERE_DUPLICATES_OK |
> +			WHERE_SEEK_TABLE;
> +		if (nc.ncFlags & NC_VarSelect)
> +			is_complex = true;
> +		wcf |= (is_complex ? 0 : WHERE_ONEPASS_MULTIROW);
> +		/* Create an ephemeral table used to hold all
> +		 * primary keys for rows to be deleted. Since VIEW
> +		 * is held in ephemeral table, there is no PK for
> +		 * it, so columns should be loaded manually.
> +		 */
> +		struct Index *pk = NULL;
> +		int reg_pk = parse->nMem + 1;
> +		int pk_len;
> +		int eph_cursor = parse->nTab++;
> +		int addr_eph_open = sqlite3VdbeCurrentAddr(v);
> +		if (is_view) {
> +			pk_len = table->nCol;
> +			parse->nMem += pk_len;
> +			sqlite3VdbeAddOp4(v, OP_OpenTEphemeral,
> +					  eph_cursor, pk_len, 0,
> +					  (char*)NULL, P4_KEYDEF);
>   		} else {
> -			pPk = sqlite3PrimaryKeyIndex(pTab);
> -			assert(pPk != 0);
> -			nPk = index_column_count(pPk);
> -			iPk = pParse->nMem + 1;
> -			pParse->nMem += nPk;
> -			iEphCur = pParse->nTab++;
> -			addrEphOpen =
> -			    sqlite3VdbeAddOp2(v, OP_OpenTEphemeral, iEphCur,
> -					      nPk);
> -			sql_vdbe_set_p4_key_def(pParse, pPk);
> +			pk = sqlite3PrimaryKeyIndex(table);
> +			assert(pk != NULL);
> +			pk_len = index_column_count(pk);
> +			parse->nMem += pk_len;
> +			sqlite3VdbeAddOp2(v, OP_OpenTEphemeral, eph_cursor,
> +					  pk_len);
> +			sql_vdbe_set_p4_key_def(parse, pk);
>   		}
>   
> -		/* Construct a query to find the primary key for every row
> -		 * to be deleted, based on the WHERE clause. Set variable eOnePass
> -		 * to indicate the strategy used to implement this delete:
> +		/* Construct a query to find the primary key for
> +		 * every row to be deleted, based on the WHERE
> +		 * clause. Set variable one_pass to indicate the
> +		 * strategy used to implement this delete:
>   		 *
> -		 *  ONEPASS_OFF:    Two-pass approach - use a FIFO for PK values.
> -		 *  ONEPASS_SINGLE: One-pass approach - at most one row deleted.
> -		 *  ONEPASS_MULTI:  One-pass approach - any number of rows may be deleted.
> +		 * ONEPASS_OFF:    Two-pass approach - use a FIFO
> +		 * for PK values.
> +		 * ONEPASS_SINGLE: One-pass approach - at most one
> +		 * row deleted.
> +		 * ONEPASS_MULTI:  One-pass approach - any number
> +		 * of rows may be deleted.
>   		 */
> -		pWInfo =
> -		    sqlite3WhereBegin(pParse, pTabList, pWhere, 0, 0, wcf,
> -				      iTabCur + 1);
> -		if (pWInfo == 0)
> +		struct WhereInfo *winfo =
> +		    sqlite3WhereBegin(parse, tab_list, where, NULL, NULL, wcf,
> +				      tab_cursor + 1);
> +		if (winfo == NULL)
>   			goto delete_from_cleanup;
> -		eOnePass = sqlite3WhereOkOnePass(pWInfo, aiCurOnePass);
> -		assert(eOnePass != ONEPASS_MULTI);
> -		/* Tarantool workaround: see comment in sqlite3WhereBegin.  */
> -		/* assert( bComplex || eOnePass!=ONEPASS_OFF ); */
> -
> -		/* Keep track of the number of rows to be deleted */
> -		if (user_session->sql_flags & SQLITE_CountRows) {
> -			sqlite3VdbeAddOp2(v, OP_AddImm, memCnt, 1);
> -		}
> +
> +		/* The write cursors opened by WHERE_ONEPASS */
> +		int one_pass_cur[2];
> +		int one_pass = sqlite3WhereOkOnePass(winfo, one_pass_cur);
> +		assert(one_pass != ONEPASS_MULTI);
> +		/* Tarantool: see comment in
> +		 * sqlite3WhereOkOnePass.
> +		 */
> +		/* assert(is_complex || one_pass != ONEPASS_OFF); */
> +
> +		/* Keep track of the number of rows to be
> +		 * deleted.
> +		 */
> +		if (user_session->sql_flags & SQLITE_CountRows)
> +			sqlite3VdbeAddOp2(v, OP_AddImm, reg_count, 1);
>   
>   		/* Extract the primary key for the current row */
> -		if (!isView) {
> -			for (i = 0; i < nPk; i++) {
> -				assert(pPk->aiColumn[i] >= 0);
> -				sqlite3ExprCodeGetColumnOfTable(v, pTab,
> -								iTabCur,
> -								pPk->
> +		if (!is_view) {
> +			for (int i = 0; i < pk_len; i++) {
> +				assert(pk->aiColumn[i] >= 0);
> +				sqlite3ExprCodeGetColumnOfTable(v, table,
> +								tab_cursor,
> +								pk->
>   								aiColumn[i],
> -								iPk + i);
> +								reg_pk + i);
>   			}
>   		} else {
> -			for (i = 0; i < nPk; i++) {
> -				sqlite3VdbeAddOp3(v, OP_Column, iDataCur,
> -						  i, iPk + i);
> +			for (int i = 0; i < pk_len; i++) {
> +				sqlite3VdbeAddOp3(v, OP_Column, tab_cursor,
> +						  i, reg_pk + i);
>   			}
>   		}
> -		iKey = iPk;
>   
> -		if (eOnePass != ONEPASS_OFF) {
> -			/* For ONEPASS, no need to store the primary-key. There is only
> -			 * one, so just keep it in its register(s) and fall through to the
> -			 * delete code.
> +		int reg_key;
> +		int key_len;
> +		if (one_pass != ONEPASS_OFF) {
> +			/* For ONEPASS, no need to store the
> +			 * primary-key. There is only one, so just
> +			 * keep it in its register(s) and fall
> +			 * through to the delete code.
>   			 */
> -			nKey = nPk;	/* OP_Found will use an unpacked key */
> -			aToOpen = sqlite3DbMallocRawNN(db, nIdx + 2);
> -			if (aToOpen == 0) {
> -				sqlite3WhereEnd(pWInfo);
> -				goto delete_from_cleanup;
> -			}
> -			memset(aToOpen, 1, nIdx + 1);
> -			aToOpen[nIdx + 1] = 0;
> -			if (aiCurOnePass[0] >= 0)
> -				aToOpen[aiCurOnePass[0] - iTabCur] = 0;
> -			if (aiCurOnePass[1] >= 0)
> -				aToOpen[aiCurOnePass[1] - iTabCur] = 0;
> -			if (addrEphOpen)
> -				sqlite3VdbeChangeToNoop(v, addrEphOpen);
> +			reg_key = reg_pk;
> +			/* OP_Found will use an unpacked key */
> +			key_len = pk_len;
> +			sqlite3VdbeChangeToNoop(v, addr_eph_open);
>   		} else {
> -			/* Add the PK key for this row to the temporary table */
> -			iKey = ++pParse->nMem;
> -			nKey = 0;	/* Zero tells OP_Found to use a composite key */
> -			const char *zAff = isView ? 0 :
> -					  sqlite3IndexAffinityStr(pParse->db, pPk);
> -			sqlite3VdbeAddOp4(v, OP_MakeRecord, iPk, nPk, iKey, zAff, nPk);
> -			/* Set flag to save memory allocating one by malloc. */
> +			/* Add the PK key for this row to the
> +			 * temporary table.
> +			 */
> +			reg_key = ++parse->nMem;
> +			/* Zero tells OP_Found to use a composite
> +			 * key.
> +			 */
> +			key_len = 0;
> +			const char *zAff = is_view ? NULL :
> +					  sqlite3IndexAffinityStr(parse->db, pk);
> +			sqlite3VdbeAddOp4(v, OP_MakeRecord, reg_pk, pk_len,
> +					  reg_key, zAff, pk_len);
> +			/* Set flag to save memory allocating one
> +			 * by malloc.
> +			 */
>   			sqlite3VdbeChangeP5(v, 1);
> -			sqlite3VdbeAddOp2(v, OP_IdxInsert, iEphCur, iKey);
> +			sqlite3VdbeAddOp2(v, OP_IdxInsert, eph_cursor, reg_key);
>   		}
>   
> -		/* If this DELETE cannot use the ONEPASS strategy, this is the
> -		 * end of the WHERE loop
> +		/* If this DELETE cannot use the ONEPASS strategy,
> +		 * this is the end of the WHERE loop.
>   		 */
> -		if (eOnePass != ONEPASS_OFF) {
> -			addrBypass = sqlite3VdbeMakeLabel(v);
> -		} else {
> -			sqlite3WhereEnd(pWInfo);
> -		}
> -
> -		/* Unless this is a view, open cursors for the table we are
> -		 * deleting from and all its indices. If this is a view, then the
> -		 * only effect this statement has is to fire the INSTEAD OF
> +		int addr_bypass = 0;
> +		if (one_pass != ONEPASS_OFF)
> +			addr_bypass = sqlite3VdbeMakeLabel(v);
> +		else
> +			sqlite3WhereEnd(winfo);
> +
> +		/* Unless this is a view, open cursors for the
> +		 * table we are deleting from and all its indices.
> +		 * If this is a view, then the only effect this
> +		 * statement has is to fire the INSTEAD OF
>   		 * triggers.
>   		 */
> -		if (!isView) {
> +		if (!is_view) {
>   			int iAddrOnce = 0;
> -			if (eOnePass == ONEPASS_MULTI) {
> +			if (one_pass == ONEPASS_MULTI) {
>   				iAddrOnce = sqlite3VdbeAddOp0(v, OP_Once);
>   				VdbeCoverage(v);
>   			}
> -			sqlite3OpenTableAndIndices(pParse, pTab, OP_OpenWrite,
> -						   OPFLAG_FORDELETE, iTabCur,
> -						   aToOpen, &iDataCur,
> -						   &iIdxCur,
> -						   ON_CONFLICT_ACTION_NONE, 0);
> -			assert(pPk || iDataCur == iTabCur);
> -			assert(pPk || iIdxCur == iDataCur + 1);
> -			if (eOnePass == ONEPASS_MULTI)
> +
> +			int space_ptr_reg = ++parse->nMem;
> +			sqlite3VdbeAddOp4Ptr(v, OP_LoadPtr, 0, space_ptr_reg, 0,
> +					     (void *) space);
> +			sqlite3VdbeAddOp3(v, OP_OpenWrite, tab_cursor,
> +					  table->tnum, space_ptr_reg);
> +			sql_vdbe_set_p4_key_def(parse, pk);
> +			VdbeComment((v, "%s", pk->zName));
> +
> +			if (one_pass == ONEPASS_MULTI)
>   				sqlite3VdbeJumpHere(v, iAddrOnce);
>   		}
>   
> -		/* Set up a loop over the primary-keys that were found in the
> -		 * where-clause loop above.
> +		/* Set up a loop over the primary-keys that were
> +		 * found in the where-clause loop above.
>   		 */
> -		if (eOnePass != ONEPASS_OFF) {
> -			assert(nKey == nPk);	/* OP_Found will use an unpacked key */
> -			if (aToOpen[iDataCur - iTabCur]) {
> -				assert(pPk != 0 || pTab->pSelect != 0);
> -				sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur,
> -						     addrBypass, iKey, nKey);
> +		int addr_loop = 0;
> +		if (one_pass != ONEPASS_OFF) {
> +			/* OP_Found will use an unpacked key. */
> +			assert(key_len == pk_len);
> +			assert(pk != NULL || table->pSelect != NULL);
> +			sqlite3VdbeAddOp4Int(v, OP_NotFound, tab_cursor,
> +					     addr_bypass, reg_key, key_len);
>   
> -				VdbeCoverage(v);
> -			}
> +			VdbeCoverage(v);
>   		} else {
> -			addrLoop = sqlite3VdbeAddOp1(v, OP_Rewind, iEphCur);
> +			addr_loop = sqlite3VdbeAddOp1(v, OP_Rewind, eph_cursor);
>   			VdbeCoverage(v);
> -			sqlite3VdbeAddOp2(v, OP_RowData, iEphCur, iKey);
> +			sqlite3VdbeAddOp2(v, OP_RowData, eph_cursor, reg_key);
>   		}
>   
>   		/* Delete the row */
> -		{
> -			int count = (pParse->nested == 0);	/* True to count changes */
> -			int iIdxNoSeek = -1;
> -			if (bComplex == 0 && aiCurOnePass[1] != iDataCur
> -			    /* Tarantool: as far as ONEPASS is disabled, there's no index
> -			       w/o need of seeking.  */
> -			    && eOnePass != ONEPASS_OFF) {
> -				iIdxNoSeek = aiCurOnePass[1];
> -			}
> -			sqlite3GenerateRowDelete(pParse, pTab, pTrigger,
> -						 iDataCur, iIdxCur, iKey, nKey,
> -						 count,
> -						 ON_CONFLICT_ACTION_DEFAULT,
> -						 eOnePass,
> -						 iIdxNoSeek);
> -		}
> +		int idx_noseek = -1;
> +		if (!is_complex && one_pass_cur[1] != tab_cursor
> +		    /* Tarantool: as far as ONEPASS is disabled,
> +		     * there's no index w/o need of seeking.
> +		     */
> +		    && one_pass != ONEPASS_OFF)
> +			idx_noseek = one_pass_cur[1];
> +
> +		sql_generate_row_delete(parse, table, trigger_list, tab_cursor,
> +					reg_key, key_len, parse->nested == 0,
> +					ON_CONFLICT_ACTION_DEFAULT, one_pass,
> +					idx_noseek);
>   
>   		/* End of the loop over all primary-keys. */
> -		if (eOnePass != ONEPASS_OFF) {
> -			sqlite3VdbeResolveLabel(v, addrBypass);
> -			sqlite3WhereEnd(pWInfo);
> +		if (one_pass != ONEPASS_OFF) {
> +			sqlite3VdbeResolveLabel(v, addr_bypass);
> +			sqlite3WhereEnd(winfo);
>   		} else {
> -			sqlite3VdbeAddOp2(v, OP_Next, iEphCur, addrLoop + 1);
> +			sqlite3VdbeAddOp2(v, OP_Next, eph_cursor,
> +					  addr_loop + 1);
>   			VdbeCoverage(v);
> -			sqlite3VdbeJumpHere(v, addrLoop);
> +			sqlite3VdbeJumpHere(v, addr_loop);
>   		}
> -	}			/* End non-truncate path */
> +	}
>   
> -	/* Return the number of rows that were deleted. If this routine is
> -	 * generating code because of a call to sqlite3NestedParse(), do not
> -	 * invoke the callback function.
> +	/* Return the number of rows that were deleted. If this
> +	 * routine is generating code because of a call to
> +	 * sqlite3NestedParse(), do not invoke the callback
> +	 * function.
>   	 */
>   	if ((user_session->sql_flags & SQLITE_CountRows) &&
> -	    !pParse->nested && !pParse->pTriggerTab) {
> -		sqlite3VdbeAddOp2(v, OP_ResultRow, memCnt, 1);
> +	    parse->nested == 0 && !parse->pTriggerTab) {
> +		sqlite3VdbeAddOp2(v, OP_ResultRow, reg_count, 1);
>   		sqlite3VdbeSetNumCols(v, 1);
>   		sqlite3VdbeSetColName(v, 0, COLNAME_NAME, "rows deleted",
>   				      SQLITE_STATIC);
>   	}
>   
>    delete_from_cleanup:
> -	sqlite3SrcListDelete(db, pTabList);
> -	sql_expr_free(db, pWhere, false);
> -	sqlite3DbFree(db, aToOpen);
> -	return;
> +	sqlite3SrcListDelete(db, tab_list);
> +	sql_expr_free(db, where, false);
>   }
>   
> -/* Generate VDBE code for
> - * DELETE FROM <pTab.z> WHERE
> - *        <columns[0]> = <values[0]>
> - *    AND  ...
> - *    AND <columns[nPairs - 1]> = <values[nPairs - 1]>;
> - *
> - * This function does not increment the nested counter and is
> - * faster than nested parsing of the request above.
> - * @param pParse Parser context.
> - * @param pTab Table name.
> - * @param columns Column names array.
> - * @param values Column values array.
> - * @param nPairs Length of @columns and @values.
> - *
> - * In case of error the @values elements are deleted.
> - */
>   void
> -sqlite3DeleteByKey(Parse *pParse, char *zTab, const char **columns,
> -		   Expr **values, int nPairs)
> +sql_delete_by_where(struct Parse *parse, char *t_name, const char **columns,
> +		    struct Expr **values, int pairs_count)
>   {
> -	Expr *where = NULL;
> -	SrcList *src;
> -
> -		assert(nPairs > 0);
> -	if (pParse->nErr > 0 || pParse->db->mallocFailed)
> +	if (parse->nErr > 0 || parse->db->mallocFailed)
>   		goto error;
> -	src = sql_alloc_src_list(pParse->db);
> -	src->a[0].zName = sqlite3DbStrDup(pParse->db, zTab);
> +	struct SrcList *src = sql_alloc_src_list(parse->db);
> +	src->a[0].zName = sqlite3DbStrDup(parse->db, t_name);
>   	if (src == NULL)
>   		goto error;
>   	/* Dummy init of INDEXED BY clause. */
> -	Token t = { NULL, 0, false };
> -	sqlite3SrcListIndexedBy(pParse, src, &t);
> +	struct Token t = {NULL, 0, false};
> +	sqlite3SrcListIndexedBy(parse, src, &t);
>   
> -	for (int i = 0; i < nPairs; ++i) {
> -		Expr *col_expr = sqlite3Expr(pParse->db, TK_ID, columns[i]);
> +	struct Expr *where = NULL;
> +	assert(pairs_count > 0);
> +	for (int i = 0; i < pairs_count; ++i) {
> +		struct Expr *col_expr = sqlite3Expr(parse->db, TK_ID, columns[i]);
>   		if (col_expr == NULL || values[i] == NULL)
>   			goto error;
> -		Expr *eq_expr =
> -		    sqlite3PExpr(pParse, TK_EQ, col_expr, values[i]);
> +		struct Expr *eq_expr =
> +		    sqlite3PExpr(parse, TK_EQ, col_expr, values[i]);
>   		/* In case of error the values[i] had been deleted in
>   		 * sqlite3PExpr already. Do not delete it second time in the
>   		 * cycle below.
> @@ -626,311 +413,175 @@ sqlite3DeleteByKey(Parse *pParse, char *zTab, const char **columns,
>   		if (i == 0) {
>   			where = eq_expr;
>   		} else {
> -			where = sqlite3ExprAnd(pParse->db, where, eq_expr);
> +			where = sqlite3ExprAnd(parse->db, where, eq_expr);
>   			if (where == NULL)
>   				goto error;
>   		}
>   	}
>   	/* DeleteFrom frees the src and exprs in case of error. */
> -	sqlite3DeleteFrom(pParse, src, where);
> +	sql_table_delete_from(parse, src, where);
>   	return;
>   
>    error:
> -	sql_expr_free(pParse->db, where, false);
> -	for (int i = 0; i < nPairs; ++i)
> -		sql_expr_free(pParse->db, values[i], false);
> +	sql_expr_free(parse->db, where, false);
> +	for (int i = 0; i < pairs_count; ++i)
> +		sql_expr_free(parse->db, values[i], false);
>   }
>   
> -/* Make sure "isView" and other macros defined above are undefined. Otherwise
> - * they may interfere with compilation of other functions in this file
> - * (or in another file, if this file becomes part of the amalgamation).
> - */
> -#ifdef isView
> -#undef isView
> -#endif
> -#ifdef pTrigger
> -#undef pTrigger
> -#endif
> -
> -/*
> - * This routine generates VDBE code that causes a single row of a
> - * single table to be deleted.  Both the original table entry and
> - * all indices are removed.
> - *
> - * Preconditions:
> - *
> - *   1.  iDataCur is an open cursor on the btree that is the canonical data
> - *       store for the table.  (This will be the PRIMARY KEY index)
> - *
> - *   2.  Read/write cursors for all indices of pTab must be open as
> - *       cursor number iIdxCur+i for the i-th index.
> - *
> - *   3.  The primary key for the row to be deleted must be stored in a
> - *       sequence of nPk memory cells starting at iPk.  If nPk==0 that means
> - *       that a search record formed from OP_MakeRecord is contained in the
> - *       single memory location iPk.
> - *
> - * eMode:
> - *   Parameter eMode may be passed either ONEPASS_OFF (0), ONEPASS_SINGLE, or
> - *   ONEPASS_MULTI.  If eMode is not ONEPASS_OFF, then the cursor
> - *   iDataCur already points to the row to delete. If eMode is ONEPASS_OFF
> - *   then this function must seek iDataCur to the entry identified by iPk
> - *   and nPk before reading from it.
> - *
> - *   If eMode is ONEPASS_MULTI, then this call is being made as part
> - *   of a ONEPASS delete that affects multiple rows. In this case, if
> - *   iIdxNoSeek is a valid cursor number (>=0), then its position should
> - *   be preserved following the delete operation. Or, if iIdxNoSeek is not
> - *   a valid cursor number, the position of iDataCur should be preserved
> - *   instead.
> - *
> - * iIdxNoSeek:
> - *   If iIdxNoSeek is a valid cursor number (>=0), then it identifies an
> - *   index cursor (from within array of cursors starting at iIdxCur) that
> - *   already points to the index entry to be deleted.
> - */
>   void
> -sqlite3GenerateRowDelete(Parse * pParse,	/* Parsing context */
> -			 Table * pTab,		/* Table containing the row to be deleted */
> -			 Trigger * pTrigger,	/* List of triggers to (potentially) fire */
> -			 int iDataCur,		/* Cursor from which column data is extracted */
> -			 int iIdxCur,		/* First index cursor */
> -			 int iPk,		/* First memory cell containing the PRIMARY KEY */
> -			 i16 nPk,		/* Number of PRIMARY KEY memory cells */
> -			 u8 count,		/* If non-zero, increment the row change counter */
> -			 enum on_conflict_action onconf,		/* Default ON CONFLICT policy for triggers */
> -			 u8 eMode,		/* ONEPASS_OFF, _SINGLE, or _MULTI.  See above */
> -			 int iIdxNoSeek)	/* Cursor number of cursor that does not need seeking */
> +sql_generate_row_delete(struct Parse *parse, struct Table *table,
> +			struct Trigger *trigger_list, int cursor, int reg_pk,
> +			short npk, bool is_count,
> +			enum on_conflict_action onconf, u8 mode,
> +			int idx_noseek)
>   {
> -	Vdbe *v = pParse->pVdbe;	/* Vdbe */
> -	int iOld = 0;		/* First register in OLD.* array */
> -	int iLabel;		/* Label resolved to end of generated code */
> -
> -	/* Vdbe is guaranteed to have been allocated by this stage. */
> -	assert(v);
> -	(void)iIdxCur;
> +	struct Vdbe *v = parse->pVdbe;
> +	/* Vdbe is guaranteed to have been allocated by this
> +	 * stage.
> +	 */
> +	assert(v != NULL);
>   	VdbeModuleComment((v, "BEGIN: GenRowDel(%d,%d,%d,%d)",
> -			   iDataCur, iIdxCur, iPk, (int)nPk));
> +			   cursor, iIdxCur, reg_pk, (int)nPk));
>   
> -	/* Seek cursor iCur to the row to delete. If this row no longer exists
> -	 * (this can happen if a trigger program has already deleted it), do
> -	 * not attempt to delete it or fire any DELETE triggers.
> +	/* Seek cursor iCur to the row to delete. If this row no
> +	 * longer exists (this can happen if a trigger program has
> +	 * already deleted it), do not attempt to delete it or
> +	 * fire any DELETE triggers.
>   	 */
> -	iLabel = sqlite3VdbeMakeLabel(v);
> -	if (eMode == ONEPASS_OFF) {
> -		sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, iLabel, iPk, nPk);
> +	int label = sqlite3VdbeMakeLabel(v);
> +	if (mode == ONEPASS_OFF) {
> +		sqlite3VdbeAddOp4Int(v, OP_NotFound, cursor, label, reg_pk, npk);
>   		VdbeCoverageIf(v, opSeek == OP_NotFound);
>   	}
>   
> +	int first_old_reg = 0;
>   	/* If there are any triggers to fire, allocate a range of registers to
>   	 * use for the old.* references in the triggers.
>   	 */
> -	if (sqlite3FkRequired(pTab, 0) || pTrigger) {
> -		u32 mask;	/* Mask of OLD.* columns in use */
> -		int iCol;	/* Iterator used while populating OLD.* */
> -		int addrStart;	/* Start of BEFORE trigger programs */
> -
> -		/* TODO: Could use temporary registers here.
> -		 */
> -		mask =
> -		    sqlite3TriggerColmask(pParse, pTrigger, 0, 0,
> -					  TRIGGER_BEFORE | TRIGGER_AFTER, pTab,
> +	if (sqlite3FkRequired(table, 0) || trigger_list != NULL) {
> +		/* Mask of OLD.* columns in use */
> +		/* TODO: Could use temporary registers here. */
> +		uint32_t mask =
> +		    sqlite3TriggerColmask(parse, trigger_list, 0, 0,
> +					  TRIGGER_BEFORE | TRIGGER_AFTER, table,
>   					  onconf);
> -		mask |= sqlite3FkOldmask(pParse, pTab);
> -		iOld = pParse->nMem + 1;
> -		pParse->nMem += (1 + pTab->nCol);
> +		mask |= sqlite3FkOldmask(parse, table);
> +		first_old_reg = parse->nMem + 1;
> +		parse->nMem += (1 + table->nCol);
>   
> -		/* Populate the OLD.* pseudo-table register array. These values will be
> -		 * used by any BEFORE and AFTER triggers that exist.
> +		/* Populate the OLD.* pseudo-table register array.
> +		 * These values will be used by any BEFORE and
> +		 * AFTER triggers that exist.
>   		 */
> -		sqlite3VdbeAddOp2(v, OP_Copy, iPk, iOld);
> -		for (iCol = 0; iCol < pTab->nCol; iCol++) {
> +		sqlite3VdbeAddOp2(v, OP_Copy, reg_pk, first_old_reg);
> +		for (int i = 0; i < table->nCol; i++) {
>   			testcase(mask != 0xffffffff && iCol == 31);
>   			testcase(mask != 0xffffffff && iCol == 32);
>   			if (mask == 0xffffffff
> -			    || (iCol <= 31 && (mask & MASKBIT32(iCol)) != 0)) {
> -				sqlite3ExprCodeGetColumnOfTable(v, pTab,
> -								iDataCur, iCol,
> -								iOld + iCol +
> -								1);
> +			    || (i <= 31 && (mask & MASKBIT32(i)) != 0)) {
> +				sqlite3ExprCodeGetColumnOfTable(v, table,
> +								cursor, i,
> +								first_old_reg +
> +								i + 1);
>   			}
>   		}
>   
>   		/* Invoke BEFORE DELETE trigger programs. */
> -		addrStart = sqlite3VdbeCurrentAddr(v);
> -		sqlite3CodeRowTrigger(pParse, pTrigger,
> -				      TK_DELETE, 0, TRIGGER_BEFORE, pTab, iOld,
> -				      onconf, iLabel);
> -
> -		/* If any BEFORE triggers were coded, then seek the cursor to the
> -		 * row to be deleted again. It may be that the BEFORE triggers moved
> -		 * the cursor or of already deleted the row that the cursor was
> -		 * pointing to.
> +		int addr_start = sqlite3VdbeCurrentAddr(v);
> +		sqlite3CodeRowTrigger(parse, trigger_list,
> +				      TK_DELETE, 0, TRIGGER_BEFORE, table,
> +				      first_old_reg, onconf, label);
> +
> +		/* If any BEFORE triggers were coded, then seek
> +		 * the cursor to the row to be deleted again. It
> +		 * may be that the BEFORE triggers moved the
> +		 * cursor or of already deleted the row that the
> +		 * cursor was pointing to.
>   		 */
> -		if (addrStart < sqlite3VdbeCurrentAddr(v)) {
> -			sqlite3VdbeAddOp4Int(v, OP_NotFound, iDataCur, iLabel, iPk,
> -					     nPk);
> +		if (addr_start < sqlite3VdbeCurrentAddr(v)) {
> +			sqlite3VdbeAddOp4Int(v, OP_NotFound, cursor, label,
> +					     reg_pk, npk);
>   			VdbeCoverageIf(v, opSeek == OP_NotFound);
>   		}
>   
> -		/* Do FK processing. This call checks that any FK constraints that
> -		 * refer to this table (i.e. constraints attached to other tables)
> -		 * are not violated by deleting this row.
> +		/* Do FK processing. This call checks that any FK
> +		 * constraints that refer to this table (i.e.
> +		 * constraints attached to other tables) are not
> +		 * violated by deleting this row.
>   		 */
> -		sqlite3FkCheck(pParse, pTab, iOld, 0, 0);
> +		sqlite3FkCheck(parse, table, first_old_reg, 0, NULL);
>   	}
>   
> -	/* Delete the index and table entries. Skip this step if pTab is really
> -	 * a view (in which case the only effect of the DELETE statement is to
> -	 * fire the INSTEAD OF triggers).
> -	 *
> -	 * If variable 'count' is non-zero, then this OP_Delete instruction should
> -	 * invoke the update-hook. The pre-update-hook, on the other hand should
> -	 * be invoked unless table pTab is a system table. The difference is that
> -	 * the update-hook is not invoked for rows removed by REPLACE, but the
> -	 * pre-update-hook is.
> +	/* Delete the index and table entries. Skip this step if
> +	 * table is really a view (in which case the only effect
> +	 * of the DELETE statement is to fire the INSTEAD OF
> +	 * triggers).
>   	 */
> -	if (pTab->pSelect == 0) {
> -		u8 p5 = 0;
> -		/* kyukhin: Tarantool handles indices uypdate automatically.  */
> -		/* sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur,0,iIdxNoSeek);  */
> -		sqlite3VdbeAddOp2(v, OP_Delete, iDataCur,
> -				  (count ? OPFLAG_NCHANGE : 0));
> -		if (eMode != ONEPASS_OFF) {
> +	if (table->pSelect == NULL) {
> +		uint8_t p5 = 0;
> +		sqlite3VdbeAddOp2(v, OP_Delete, cursor,
> +				  (is_count ? OPFLAG_NCHANGE : 0));
> +		if (mode != ONEPASS_OFF)
>   			sqlite3VdbeChangeP5(v, OPFLAG_AUXDELETE);
> -		}
> -		if (iIdxNoSeek >= 0) {
> -			sqlite3VdbeAddOp1(v, OP_Delete, iIdxNoSeek);
> -		}
> -		if (eMode == ONEPASS_MULTI)
> +
> +		if (idx_noseek >= 0)
> +			sqlite3VdbeAddOp1(v, OP_Delete, idx_noseek);
> +
> +		if (mode == ONEPASS_MULTI)
>   			p5 |= OPFLAG_SAVEPOSITION;
>   		sqlite3VdbeChangeP5(v, p5);
>   	}
>   
> -	/* Do any ON CASCADE, SET NULL or SET DEFAULT operations required to
> -	 * handle rows (possibly in other tables) that refer via a foreign key
> -	 * to the row just deleted.
> +	/* Do any ON CASCADE, SET NULL or SET DEFAULT operations
> +	 * required to handle rows (possibly in other tables) that
> +	 * refer via a foreign key to the row just deleted.
>   	 */
> -	sqlite3FkActions(pParse, pTab, 0, iOld, 0);
> +	sqlite3FkActions(parse, table, 0, first_old_reg, 0);
>   
>   	/* Invoke AFTER DELETE trigger programs. */
> -	sqlite3CodeRowTrigger(pParse, pTrigger,
> -			      TK_DELETE, 0, TRIGGER_AFTER, pTab, iOld, onconf,
> -			      iLabel);
> +	sqlite3CodeRowTrigger(parse, trigger_list,
> +			      TK_DELETE, 0, TRIGGER_AFTER, table, first_old_reg,
> +			      onconf, label);
>   
> -	/* Jump here if the row had already been deleted before any BEFORE
> -	 * trigger programs were invoked. Or if a trigger program throws a
> -	 * RAISE(IGNORE) exception.
> +	/* Jump here if the row had already been deleted before
> +	 * any BEFORE trigger programs were invoked. Or if a trigger program
> +	 * throws a RAISE(IGNORE) exception.
>   	 */
> -	sqlite3VdbeResolveLabel(v, iLabel);
> +	sqlite3VdbeResolveLabel(v, label);
>   	VdbeModuleComment((v, "END: GenRowDel()"));
>   }
>   
> -/*
> - * This routine generates VDBE code that causes the deletion of all
> - * index entries associated with a single row of a single table, pTab
> - *
> - * Preconditions:
> - *
> - *   1.  A read/write cursor "iDataCur" must be open on the canonical storage
> - *       btree for the table pTab.  (This will be primary key index)
> - *
> - *   2.  Read/write cursor for primary index of pTab must be open as
> - *       cursor number iIdxCur.  (The pTab->pIndex index is the 0-th index.)
> - *
> - *   3.  The "iDataCur" cursor must be already positioned on the row
> - *       that is to be deleted.
> - */
> -void
> -sqlite3GenerateRowIndexDelete(Parse * pParse,	/* Parsing and code generating context */
> -			      Table * pTab,	/* Table containing the row to be deleted */
> -			      int iDataCur,	/* Cursor of table holding data. */
> -			      int iIdxCur)	/* Primary index cursor */
> -{
> -	int r1 = -1;		/* Register holding an index key */
> -	int iPartIdxLabel;	/* Jump destination for skipping partial index entries */
> -	Vdbe *v;		/* The prepared statement under construction */
> -	Index *pPk;		/* PRIMARY KEY index */
> -
> -	v = pParse->pVdbe;
> -	pPk = sqlite3PrimaryKeyIndex(pTab);
> -	/* In Tarantool it is enough to delete row just from pk */
> -	VdbeModuleComment((v, "GenRowIdxDel for %s", pPk->zName));
> -	r1 = sqlite3GenerateIndexKey(pParse, pPk, iDataCur, 0, &iPartIdxLabel,
> -				     NULL, r1);
> -	sqlite3VdbeAddOp3(v, OP_IdxDelete, iIdxCur, r1, index_column_count(pPk));
> -	sqlite3ResolvePartIdxLabel(pParse, iPartIdxLabel);
> -}
> -
> -/*
> - * Generate code that will assemble an index key and stores it in register
> - * regOut.  The key with be for index pIdx which is an index on pTab.
> - * iCur is the index of a cursor open on the pTab table and pointing to
> - * the entry that needs indexing.
> - * iCur must be the cursor of the PRIMARY KEY index.
> - *
> - * Return a register number which is the first in a block of
> - * registers that holds the elements of the index key.  The
> - * block of registers has already been deallocated by the time
> - * this routine returns.
> - *
> - * If *piPartIdxLabel is not NULL, fill it in with a label and jump
> - * to that label if pIdx is a partial index that should be skipped.
> - * The label should be resolved using sqlite3ResolvePartIdxLabel().
> - * A partial index should be skipped if its WHERE clause evaluates
> - * to false or null.  If pIdx is not a partial index, *piPartIdxLabel
> - * will be set to zero which is an empty label that is ignored by
> - * sqlite3ResolvePartIdxLabel().
> - *
> - * The pPrior and regPrior parameters are used to implement a cache to
> - * avoid unnecessary register loads.  If pPrior is not NULL, then it is
> - * a pointer to a different index for which an index key has just been
> - * computed into register regPrior.  If the current pIdx index is generating
> - * its key into the same sequence of registers and if pPrior and pIdx share
> - * a column in common, then the register corresponding to that column already
> - * holds the correct value and the loading of that register is skipped.
> - * This optimization is helpful when doing a DELETE or an INTEGRITY_CHECK
> - * on a table with multiple indices, and especially with
> - * the PRIMARY KEY columns of the index.
> - */
>   int
> -sqlite3GenerateIndexKey(Parse * pParse,	/* Parsing context */
> -			Index * pIdx,	/* The index for which to generate a key */
> -			int iDataCur,	/* Cursor number from which to take column data */
> -			int regOut,	/* Put the new key into this register if not 0 */
> -			int *piPartIdxLabel,	/* OUT: Jump to this label to skip partial index */
> -			Index * pPrior,	/* Previously generated index key */
> -			int regPrior)	/* Register holding previous generated key */
> +sql_generate_index_key(struct Parse *parse, struct Index *index, int cursor,
> +		       int reg_out, int *part_idx_label, struct Index *prev,
> +		       int reg_prev)
>   {
> -	Vdbe *v = pParse->pVdbe;
> -	int j;
> -	int regBase;
> -	int nCol;
> -
> -	if (piPartIdxLabel) {
> -		if (pIdx->pPartIdxWhere) {
> -			*piPartIdxLabel = sqlite3VdbeMakeLabel(v);
> -			pParse->iSelfTab = iDataCur;
> -			sqlite3ExprCachePush(pParse);
> -			sqlite3ExprIfFalseDup(pParse, pIdx->pPartIdxWhere,
> -					      *piPartIdxLabel,
> +	Vdbe *v = parse->pVdbe;
> +
> +	if (part_idx_label != NULL) {
> +		if (index->pPartIdxWhere) {
> +			*part_idx_label = sqlite3VdbeMakeLabel(v);
> +			parse->iSelfTab = cursor;
> +			sqlite3ExprCachePush(parse);
> +			sqlite3ExprIfFalseDup(parse, index->pPartIdxWhere,
> +					      *part_idx_label,
>   					      SQLITE_JUMPIFNULL);
>   		} else {
> -			*piPartIdxLabel = 0;
> +			*part_idx_label = 0;
>   		}
>   	}
> -	nCol = index_column_count(pIdx);
> -	regBase = sqlite3GetTempRange(pParse, nCol);
> -	if (pPrior && (regBase != regPrior || pPrior->pPartIdxWhere))
> -		pPrior = 0;
> -	for (j = 0; j < nCol; j++) {
> -		if (pPrior && pPrior->aiColumn[j] == pIdx->aiColumn[j]
> -		    && pPrior->aiColumn[j] != XN_EXPR) {
> +	int col_cnt = index_column_count(index);
> +	int reg_base = sqlite3GetTempRange(parse, col_cnt);
> +	if (prev != NULL && (reg_base != reg_prev || prev->pPartIdxWhere))
> +		prev = NULL;
> +	for (int j = 0; j < col_cnt; j++) {
> +		if (prev != NULL && prev->aiColumn[j] == index->aiColumn[j]
> +		    && prev->aiColumn[j] != XN_EXPR) {
>   			/* This column was already computed by the previous index */
>   			continue;
>   		}
> -		sqlite3ExprCodeLoadIndexColumn(pParse, pIdx, iDataCur, j,
> -					       regBase + j);
> +		sqlite3ExprCodeLoadIndexColumn(parse, index, cursor, j,
> +					       reg_base + j);
>   		/* If the column affinity is REAL but the number is an integer, then it
>   		 * might be stored in the table as an integer (using a compact
>   		 * representation) then converted to REAL by an OP_RealAffinity opcode.
> @@ -940,23 +591,18 @@ sqlite3GenerateIndexKey(Parse * pParse,	/* Parsing context */
>   		 */
>   		sqlite3VdbeDeletePriorOpcode(v, OP_RealAffinity);
>   	}
> -	if (regOut) {
> -		sqlite3VdbeAddOp3(v, OP_MakeRecord, regBase, nCol, regOut);
> -	}
> -	sqlite3ReleaseTempRange(pParse, regBase, nCol);
> -	return regBase;
> +	if (reg_out)
> +		sqlite3VdbeAddOp3(v, OP_MakeRecord, reg_base, col_cnt, reg_out);
> +
> +	sqlite3ReleaseTempRange(parse, reg_base, col_cnt);
> +	return reg_base;
>   }
>   
> -/*
> - * If a prior call to sqlite3GenerateIndexKey() generated a jump-over label
> - * because it was a partial index, then this routine should be called to
> - * resolve that label.
> - */
>   void
> -sqlite3ResolvePartIdxLabel(Parse * pParse, int iLabel)
> +sql_resolve_part_idx_label(struct Parse *parse, int label)
>   {
> -	if (iLabel) {
> -		sqlite3VdbeResolveLabel(pParse->pVdbe, iLabel);
> -		sqlite3ExprCachePop(pParse);
> +	if (label != 0) {
> +		sqlite3VdbeResolveLabel(parse->pVdbe, label);
> +		sqlite3ExprCachePop(parse);
>   	}
>   }
> diff --git a/src/box/sql/fkey.c b/src/box/sql/fkey.c
> index 60b4786..a21dd2d 100644
> --- a/src/box/sql/fkey.c
> +++ b/src/box/sql/fkey.c
> @@ -784,7 +784,8 @@ sqlite3FkDropTable(Parse * pParse, SrcList * pName, Table * pTab)
>   		pParse->disableTriggers = 1;
>   		/* Staring new transaction before DELETE FROM <tbl> */
>   		sqlite3VdbeAddOp0(v, OP_TTransaction);
> -		sqlite3DeleteFrom(pParse, sqlite3SrcListDup(db, pName, 0), 0);
> +		sql_table_delete_from(pParse, sqlite3SrcListDup(db, pName, 0),
> +				      NULL);
>   		pParse->disableTriggers = 0;
>   
>   		/* If the DELETE has generated immediate foreign key constraint
> diff --git a/src/box/sql/insert.c b/src/box/sql/insert.c
> index 1ad7469..2d49296 100644
> --- a/src/box/sql/insert.c
> +++ b/src/box/sql/insert.c
> @@ -379,7 +379,7 @@ sqlite3Insert(Parse * pParse,	/* Parser context */
>   	zTab = pTabList->a[0].zName;
>   	if (NEVER(zTab == 0))
>   		goto insert_cleanup;
> -	pTab = sqlite3SrcListLookup(pParse, pTabList);
> +	pTab = sql_list_lookup_table(pParse, pTabList);
>   	if (pTab == 0) {
>   		goto insert_cleanup;
>   	}
> @@ -406,13 +406,13 @@ sqlite3Insert(Parse * pParse,	/* Parser context */
>   	/* If pTab is really a view, make sure it has been initialized.
>   	 * ViewGetColumnNames() is a no-op if pTab is not a view.
>   	 */
> -	if (sqlite3ViewGetColumnNames(pParse, pTab)) {
> +	if (sqlite3ViewGetColumnNames(pParse, pTab))
>   		goto insert_cleanup;
> -	}
>   
> -	/* Cannot insert into a read-only table.
> -	 */
> -	if (sqlite3IsReadOnly(pParse, pTab, tmask)) {
> +	/* Cannot insert into a read-only table. */
> +	if (isView && tmask == 0) {
> +		sqlite3ErrorMsg(pParse, "cannot modify %s because it is a view",
> +				pTab->zName);
>   		goto insert_cleanup;
>   	}
>   
> @@ -1511,13 +1511,13 @@ sqlite3GenerateConstraintChecks(Parse * pParse,		/* The parser context */
>   								 TK_DELETE, 0,
>   								 0);
>   				}
> -				sqlite3GenerateRowDelete(pParse, pTab, pTrigger,
> -							 iDataCur, iIdxCur,
> -							 regR, nPkField, 0,
> -							 ON_CONFLICT_ACTION_REPLACE,
> -							 (pIdx ==
> -							  pPk ? ONEPASS_SINGLE :
> -							  ONEPASS_OFF), -1);
> +				sql_generate_row_delete(pParse, pTab, pTrigger,
> +							iDataCur,
> +							regR, nPkField, 0,
> +							ON_CONFLICT_ACTION_REPLACE,
> +							(pIdx ==
> +							 pPk ? ONEPASS_SINGLE :
> +							 ONEPASS_OFF), -1);
>   				seenReplace = 1;
>   				break;
>   			}
> diff --git a/src/box/sql/parse.y b/src/box/sql/parse.y
> index 872647d..9343c0e 100644
> --- a/src/box/sql/parse.y
> +++ b/src/box/sql/parse.y
> @@ -738,7 +738,7 @@ cmd ::= with(C) DELETE FROM fullname(X) indexed_opt(I) where_opt(W). {
>     sqlSubProgramsRemaining = SQL_MAX_COMPILING_TRIGGERS;
>     /* Instruct SQL to initate Tarantool's transaction.  */
>     pParse->initiateTTrans = true;
> -  sqlite3DeleteFrom(pParse,X,W);
> +  sql_table_delete_from(pParse,X,W);
>   }
>   %endif
>   
> diff --git a/src/box/sql/sqliteInt.h b/src/box/sql/sqliteInt.h
> index e056d63..6f23859 100644
> --- a/src/box/sql/sqliteInt.h
> +++ b/src/box/sql/sqliteInt.h
> @@ -1994,7 +1994,6 @@ sql_space_tuple_log_count(struct Table *tab);
>   /*
>    * Allowed values for Table.tabFlags.
>    */
> -#define TF_Readonly        0x01	/* Read-only system table */
>   #define TF_Ephemeral       0x02	/* An ephemeral table */
>   #define TF_HasPrimaryKey   0x04	/* Table has a primary key */
>   #define TF_Autoincrement   0x08	/* Integer primary key is autoincrement */
> @@ -3671,15 +3670,69 @@ int sqlite3Select(Parse *, Select *, SelectDest *);
>   Select *sqlite3SelectNew(Parse *, ExprList *, SrcList *, Expr *, ExprList *,
>   			 Expr *, ExprList *, u32, Expr *, Expr *);
>   void sqlite3SelectDelete(sqlite3 *, Select *);
> -Table *sqlite3SrcListLookup(Parse *, SrcList *);
> +
> +/**
> + * While a SrcList can in general represent multiple tables and
> + * subqueries (as in the FROM clause of a SELECT statement) in
> + * this case it contains the name of a single table, as one might
> + * find in an INSERT, DELETE, or UPDATE statement.  Look up that
> + * table in the symbol table and return a pointer.  Set an error
> + * message and return NULL if the table name is not found or if
> + * any other error occurs.
> + *
> + * The following fields are initialized appropriate in src_list:
> + *
> + *    pSrc->a[0].pTab       Pointer to the Table object.
> + *    pSrc->a[0].pIndex     Pointer to the INDEXED BY index, if
> + *                          there is one.
> + *
> + * @param parse Parsing context.
> + * @param src_list List containing single table element.
> + * @retval Table object if found, NULL oterwise.
> + */
> +struct Table *
> +sql_list_lookup_table(struct Parse *parse, SrcList *src_list);
> +
>   int sqlite3IsReadOnly(Parse *, Table *, int);
>   void sqlite3OpenTable(Parse *, int iCur, Table *, int);
> -#if defined(SQLITE_ENABLE_UPDATE_DELETE_LIMIT)
> -Expr *sqlite3LimitWhere(Parse *, SrcList *, Expr *, ExprList *, Expr *, Expr *,
> -			char *);
> -#endif
> -void sqlite3DeleteFrom(Parse *, SrcList *, Expr *);
> -void sqlite3DeleteByKey(Parse *, char *, const char **, Expr **, int);
> +/**
> + * Generate code for a DELETE FROM statement.
> + *
> + *     DELETE FROM table_wxyz WHERE a<5 AND b NOT NULL;
> + *                 \________/       \________________/
> + *                  pTabList              pWhere
> + *
> + * @param parse Parsing context.
> + * @param tab_list List of single element which table from which
> + * deletetion if performed.
> + * @param where The WHERE clause.  May be NULL.
> + */
> +void
> +sql_table_delete_from(struct Parse *parse, struct SrcList *tab_list,
> +		      struct Expr *where);
> +
> +/**
> + * Generate VDBE code for
> + * DELETE FROM <t_name> WHERE
> + *        <columns[0]> = <values[0]>
> + *    AND  ...
> + *    AND <columns[nPairs - 1]> = <values[nPairs - 1]>;
> + *
> + * This function does not increment the nested counter and is
> + * faster than nested parsing of the request above.
> + *
> + * @param parse Parser context.
> + * @param t_name Table name.
> + * @param columns Column names array.
> + * @param values Column values array.
> + * @param pairs_count Length of @columns and @values.
> + *
> + * In case of error the @values elements are deleted.
> + */
> +void
> +sql_delete_by_where(struct Parse *parse, char *t_name, const char **columns,
> +		    struct Expr **values, int pairs_count);
> +
>   void sqlite3Update(Parse *, SrcList *, ExprList *, Expr *,
>   		   enum on_conflict_action);
>   WhereInfo *sqlite3WhereBegin(Parse *, SrcList *, Expr *, ExprList *, ExprList *,
> @@ -3782,11 +3835,121 @@ int sqlite3ExprContainsSubquery(Expr *);
>   int sqlite3ExprIsInteger(Expr *, int *);
>   int sqlite3ExprCanBeNull(const Expr *);
>   int sqlite3ExprNeedsNoAffinityChange(const Expr *, char);
> -void sqlite3GenerateRowDelete(Parse *, Table *, Trigger *, int, int, int, i16,
> -			      u8, enum on_conflict_action, u8, int);
> -void sqlite3GenerateRowIndexDelete(Parse *, Table *, int, int);
> -int sqlite3GenerateIndexKey(Parse *, Index *, int, int, int *, Index *, int);
> -void sqlite3ResolvePartIdxLabel(Parse *, int);
> +
> +/**
> + * This routine generates VDBE code that causes a single row of a
> + * single table to be deleted.  Both the original table entry and
> + * all indices are removed.
> + *
> + * Preconditions:
> + *
> + *   1.  cursor is an open cursor on the btree that is the
> + *       canonical data store for the table.  (This will be the
> + *       PRIMARY KEY index)
> + *
> + *   2.  The primary key for the row to be deleted must be stored
> + *       in a sequence of nPk memory cells starting at iPk. If
> + *       nPk==0 that means that a search record formed from
> + *       OP_MakeRecord is contained in the single memory location
> + *       iPk.
> + *
> + * mode:
> + *   Parameter mode may be passed either ONEPASS_OFF (0),
> + *   ONEPASS_SINGLE, or ONEPASS_MULTI.  If eMode is not
> + *   ONEPASS_OFF, then the cursor already points to the row to
> + *   delete. If eMode is ONEPASS_OFF then this function must seek
> + *   cursor to the entry identified by ipk and npk before reading
> + *   from it.
> + *
> + *   If mode is ONEPASS_MULTI, then this call is being made as
> + *   part of a ONEPASS delete that affects multiple rows. In this
> + *   case, if idx_noseek is a valid cursor number (>=0), then its
> + *   position should be preserved following the delete operation.
> + *   Or, if iIdxNoSeek is not a valid cursor number, the position
> + *   of cursor should be preserved instead.
> + *
> + * idx_noseek:
> + *   If idx_noseek is a valid cursor number (>=0), then it
> + *   identifies an index cursor that already points to the index
> + *   entry to be deleted.
> + *
> + * @param parse Parsing context.
> + * @param table Table containing the row to be deleted.
> + * @param trigger_list List of triggers to (potentially) fire.
> + * @param cursor Cursor from which column data is extracted/
> + * @param ipk First memory cell containing the PRIMARY KEY.
> + * @param npk umber of PRIMARY KEY memory cells.
> + * @param is_count If non-zero, increment the row change counter.
> + * @param onconf Default ON CONFLICT policy for triggers.
> + * @param mode ONEPASS_OFF, _SINGLE, or _MULTI.  See above.
> + * @param idx_noseek Cursor number of cursor that does not need
> +          seeking.
> + */
> +void
> +sql_generate_row_delete(struct Parse *parse, struct Table *table,
> +			struct Trigger *trigger_list, int cursor, int ipk,
> +			short npk, bool is_count,
> +			enum on_conflict_action onconf, u8 eMode,
> +			int idx_noseek);
> +
> +/**
> + * Generate code that will assemble an index key and stores it in
> + * register reg_out.  The key with be for index pIdx which is an
> + * index on table. cursor is the index of a cursor open on the
> + * table table and pointing to the entry that needs indexing.
> + * cursor must be the cursor of the PRIMARY KEY index.
> + *
> + * Return a register number which is the first in a block of
> + * registers that holds the elements of the index key.  The
> + * block of registers has already been deallocated by the time
> + * this routine returns.
> + *
> + * If *part_idx_label is not NULL, fill it in with a label and
> + * jump to that label if pIdx is a partial index that should be
> + * skipped. The label should be resolved using
> + * sql_resolve_part_idx_label(). A partial index should be skipped
> + * if its WHERE clause evaluates to false or null.  If index is
> + * not a partial index, *piPartIdxLabel will be set to zero which
> + * is an empty label that is ignored by sql_resolve_part_idx_label().
> + *
> + * The pPrior and regPrior parameters are used to implement a
> + * cache to avoid unnecessary register loads.  If prev is not
> + * NULL, then it is a pointer to a different index for which an
> + * index key has just been computed into register reg_prev. If the
> + * current pIdx index is generating its key into the same
> + * sequence of registers and if prev and index share a column in
> + * common, then the register corresponding to that column already
> + * holds the correct value and the loading of that register is
> + * skipped. This optimization is helpful when doing a DELETE or
> + * an INTEGRITY_CHECK on a table with multiple indices, and
> + * especially with the PRIMARY KEY columns of the index.
> + *
> + * @param parse Parsing context.
> + * @param index The index for which to generate a key.
> + * @param cursor Cursor number from which to take column data.
> + * @param reg_out Put the new key into this register if not NULL.
> + * @param[out] part_idx_label Jump to this label to skip partial
> + *        index.
> + * @param prev Previously generated index key
> + * @param reg_prev Register holding previous generated key.
> + * @retval Register containing new record
> + */
> +int
> +sql_generate_index_key(struct Parse *parse, struct Index *index, int cursor,
> +		       int reg_out, int *part_idx_label, struct Index *prev,
> +		       int reg_prev);
> +
> +/**
> + * If a prior call to sqlite3GenerateIndexKey() generated a
> + * jump-over label because it was a partial index, then this
> + * routine should be called to resolve that label.
> + *
> + * @param parse Parsing context.
> + * @param label Label to resolve.
> + */
> +void
> +sql_resolve_part_idx_label(struct Parse *parse, int label);
> +
>   void sqlite3GenerateConstraintChecks(Parse *, Table *, int *, int, int, int,
>   				     int, u8, struct on_conflict *, int, int *,
>   				     int *);
> @@ -3831,9 +3994,20 @@ int sqlite3SafetyCheckOk(sqlite3 *);
>   int sqlite3SafetyCheckSickOrOk(sqlite3 *);
>   void sqlite3ChangeCookie(Parse *);
>   
> -#if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
> -void sqlite3MaterializeView(Parse *, Table *, Expr *, int);
> -#endif
> +/**
> + * Evaluate a view and store its result in an ephemeral table.
> + * The where argument is an optional WHERE clause that restricts
> + * the set of rows in the view that are to be added to the
> + * ephemeral table.
> + *
> + * @param parse Parsing context.
> + * @param name View name.
> + * @param where Option WHERE clause to be added.
> + * @param cursor Cursor number for ephemeral table.
> + */
> +void
> +sql_materialize_view(struct Parse *parse, const char *name, struct Expr *where,
> +		     int cursor);
>   
>   #ifndef SQLITE_OMIT_TRIGGER
>   void sqlite3BeginTrigger(Parse *, Token *, int, int, IdList *, SrcList *,
> diff --git a/src/box/sql/trigger.c b/src/box/sql/trigger.c
> index 28c56db..e6d9925 100644
> --- a/src/box/sql/trigger.c
> +++ b/src/box/sql/trigger.c
> @@ -111,7 +111,7 @@ sqlite3BeginTrigger(Parse * pParse,	/* The parse context of the CREATE TRIGGER s
>   	if (sqlite3FixSrcList(&sFix, pTableName)) {
>   		goto trigger_cleanup;
>   	}
> -	pTab = sqlite3SrcListLookup(pParse, pTableName);
> +	pTab = sql_list_lookup_table(pParse, pTableName);
>   	if (!pTab) {
>   		goto trigger_cleanup;
>   	}
> @@ -744,11 +744,11 @@ codeTriggerProgram(Parse * pParse,	/* The parser context */
>   				break;
>   			}
>   		case TK_DELETE:{
> -				sqlite3DeleteFrom(pParse,
> -						  targetSrcList(pParse, pStep),
> -						  sqlite3ExprDup(db,
> -								 pStep->pWhere,
> -								 0)
> +				sql_table_delete_from(pParse,
> +						      targetSrcList(pParse, pStep),
> +						      sqlite3ExprDup(db,
> +								     pStep->pWhere,
> +								     0)
>   				    );
>   				break;
>   			}
> diff --git a/src/box/sql/update.c b/src/box/sql/update.c
> index de1349b..60cb229 100644
> --- a/src/box/sql/update.c
> +++ b/src/box/sql/update.c
> @@ -163,7 +163,7 @@ sqlite3Update(Parse * pParse,		/* The parser context */
>   
>   	/* Locate the table which we want to update.
>   	 */
> -	pTab = sqlite3SrcListLookup(pParse, pTabList);
> +	pTab = sql_list_lookup_table(pParse, pTabList);
>   	if (pTab == 0)
>   		goto update_cleanup;
>   
> @@ -187,7 +187,9 @@ sqlite3Update(Parse * pParse,		/* The parser context */
>   	if (sqlite3ViewGetColumnNames(pParse, pTab)) {
>   		goto update_cleanup;
>   	}
> -	if (sqlite3IsReadOnly(pParse, pTab, tmask)) {
> +	if (isView && tmask == 0) {
> +		sqlite3ErrorMsg(pParse, "cannot modify %s because it is a view",
> +				pTab->zName);
>   		goto update_cleanup;
>   	}
>   
> @@ -324,7 +326,7 @@ sqlite3Update(Parse * pParse,		/* The parser context */
>   	 */
>   #if !defined(SQLITE_OMIT_VIEW) && !defined(SQLITE_OMIT_TRIGGER)
>   	if (isView) {
> -		sqlite3MaterializeView(pParse, pTab, pWhere, iDataCur);
> +		sql_materialize_view(pParse, pTab->zName, pWhere, iDataCur);
>   		/* Number of columns from SELECT plus ID.*/
>   		nKey = pTab->nCol + 1;
>   	}
> @@ -603,7 +605,6 @@ sqlite3Update(Parse * pParse,		/* The parser context */
>   						     nKey);
>   			VdbeCoverageNeverTaken(v);
>   		}
> -		sqlite3GenerateRowIndexDelete(pParse, pTab, iDataCur, iIdxCur);
>   
>   		/* If changing the PK value, or if there are foreign key constraints
>   		 * to process, delete the old record. Otherwise, add a noop OP_Delete
> diff --git a/src/box/sql/vdbe.c b/src/box/sql/vdbe.c
> index b8d4c1a..2ad6f3e 100644
> --- a/src/box/sql/vdbe.c
> +++ b/src/box/sql/vdbe.c
> @@ -3236,20 +3236,20 @@ case OP_OpenTEphemeral: {
>   	BtCursor *pBtCur;
>   	assert(pOp->p1 >= 0);
>   	assert(pOp->p2 > 0);
> -	assert(pOp->p4type != P4_KEYDEF || pOp->p4.key_def != NULL);
> +	assert(pOp->p4type == P4_KEYDEF);
>   
>   	pCx = allocateCursor(p, pOp->p1, pOp->p2, CURTYPE_TARANTOOL);
>   	if (pCx == 0) goto no_mem;
>   	pCx->nullRow = 1;
>   
> -	pCx->key_def  = pOp->p4.key_def;
>   	pBtCur = pCx->uc.pCursor;
>   	/* Ephemeral spaces don't have space_id */
>   	pBtCur->eState = CURSOR_INVALID;
>   	pBtCur->curFlags = BTCF_TEphemCursor;
>   
>   	rc = tarantoolSqlite3EphemeralCreate(pCx->uc.pCursor, pOp->p2,
> -					     pCx->key_def);
> +					     pOp->p4.key_def);
> +	pCx->key_def = pCx->uc.pCursor->index->def->key_def;
>   	if (rc) goto abort_due_to_error;
>   	break;
>   }
> diff --git a/src/box/sql/vdbeaux.c b/src/box/sql/vdbeaux.c
> index e67fcae..4a8a9d2 100644
> --- a/src/box/sql/vdbeaux.c
> +++ b/src/box/sql/vdbeaux.c
> @@ -1134,7 +1134,7 @@ sqlite3VdbeChangeP4(Vdbe * p, int addr, const char *zP4, int n)
>   	} if (n == P4_BOOL) {
>   		pOp->p4.b = *(bool*)zP4;
>   		pOp->p4type = P4_BOOL;
> -	} else if (zP4 != 0) {
> +	} else {
>   		assert(n < 0);
>   		pOp->p4.p = (void *)zP4;
>   		pOp->p4type = (signed char)n;
> @@ -1571,7 +1571,10 @@ displayP4(Op * pOp, char *zTemp, int nTemp)
>   #endif
>   	case P4_COLLSEQ:{
>   			struct coll *pColl = pOp->p4.pColl;
> -			sqlite3XPrintf(&x, "(%.20s)", pColl->name);
> +			if (pColl != NULL)
> +				sqlite3XPrintf(&x, "(%.20s)", pColl->name);
> +			else
> +				sqlite3XPrintf(&x, "(binary)");
>   			break;
>   		}
>   	case P4_FUNCDEF:{
>