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Overview
| Comment: | Remove the SF_Materialize flag from the SELECT object as it does not accomplish anything useful. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
65d5dcddbd34dfb2733a7a908c7c652c |
| User & Date: | drh 2014-02-04 20:46:41 |
Context
|
2014-02-04
| ||
| 23:45 | Do not mark the ephemeral tables used to hold the RHS of IN clauses as unordered because the NGQP will use those ephemeral tables to help order the output. This is not an issue for standard SQLite since ephemeral tables there are always ordered, regardless of the hint. It only affects systems that substitute an alternative storage engine. (check-in: f2504089 user: drh tags: trunk) | |
| 20:46 | Remove the SF_Materialize flag from the SELECT object as it does not accomplish anything useful. (check-in: 65d5dcdd user: drh tags: trunk) | |
| 15:55 | Rearrange fields in the Parse object for a tighter packing, resulting in an 8% size reduction on x64. (check-in: 3e1a3f68 user: drh tags: trunk) | |
Changes
Changes to src/delete.c.
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 |
int iCur /* Cursor number for ephemerial table */
){
SelectDest dest;
Select *pSel;
SrcList *pFrom;
sqlite3 *db = pParse->db;
int iDb = sqlite3SchemaToIndex(db, pView->pSchema);
pWhere = sqlite3ExprDup(db, pWhere, 0);
pFrom = sqlite3SrcListAppend(db, 0, 0, 0);
if( pFrom ){
assert( pFrom->nSrc==1 );
pFrom->a[0].zName = sqlite3DbStrDup(db, pView->zName);
pFrom->a[0].zDatabase = sqlite3DbStrDup(db, db->aDb[iDb].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);
if( pSel ) pSel->selFlags |= SF_Materialize;
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) && !defined(SQLITE_OMIT_SUBQUERY)
|
< < < < < |
93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 |
int iCur /* Cursor number for ephemerial table */
){
SelectDest dest;
Select *pSel;
SrcList *pFrom;
sqlite3 *db = pParse->db;
int iDb = sqlite3SchemaToIndex(db, pView->pSchema);
pWhere = sqlite3ExprDup(db, pWhere, 0);
pFrom = sqlite3SrcListAppend(db, 0, 0, 0);
if( pFrom ){
assert( pFrom->nSrc==1 );
pFrom->a[0].zName = sqlite3DbStrDup(db, pView->zName);
pFrom->a[0].zDatabase = sqlite3DbStrDup(db, db->aDb[iDb].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) && !defined(SQLITE_OMIT_SUBQUERY)
|
Changes to src/select.c.
4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 |
if( flattenSubquery(pParse, p, i, isAgg, isAggSub) ){
/* This subquery can be absorbed into its parent. */
if( isAggSub ){
isAgg = 1;
p->selFlags |= SF_Aggregate;
}
i = -1;
}else if( pTabList->nSrc==1 && (p->selFlags & SF_Materialize)==0
&& OptimizationEnabled(db, SQLITE_SubqCoroutine)
){
/* Implement a co-routine that will return a single row of the result
** set on each invocation.
*/
int addrTop;
int addrEof;
pItem->regReturn = ++pParse->nMem;
|
| | |
4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 4559 4560 4561 4562 4563 |
if( flattenSubquery(pParse, p, i, isAgg, isAggSub) ){
/* This subquery can be absorbed into its parent. */
if( isAggSub ){
isAgg = 1;
p->selFlags |= SF_Aggregate;
}
i = -1;
}else if( pTabList->nSrc==1
&& OptimizationEnabled(db, SQLITE_SubqCoroutine)
){
/* Implement a co-routine that will return a single row of the result
** set on each invocation.
*/
int addrTop;
int addrEof;
pItem->regReturn = ++pParse->nMem;
|
Changes to src/sqliteInt.h.
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 |
#define SF_Resolved 0x0002 /* Identifiers have been resolved */
#define SF_Aggregate 0x0004 /* Contains aggregate functions */
#define SF_UsesEphemeral 0x0008 /* Uses the OpenEphemeral opcode */
#define SF_Expanded 0x0010 /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo 0x0020 /* FROM subqueries have Table metadata */
#define SF_UseSorter 0x0040 /* Sort using a sorter */
#define SF_Values 0x0080 /* Synthesized from VALUES clause */
#define SF_Materialize 0x0100 /* Force materialization of views */
#define SF_NestedFrom 0x0200 /* Part of a parenthesized FROM clause */
#define SF_MaybeConvert 0x0400 /* Need convertCompoundSelectToSubquery() */
#define SF_Recursive 0x0800 /* The recursive part of a recursive CTE */
/*
** The results of a SELECT can be distributed in several ways, as defined
|
| |
2157 2158 2159 2160 2161 2162 2163 2164 2165 2166 2167 2168 2169 2170 2171 |
#define SF_Resolved 0x0002 /* Identifiers have been resolved */
#define SF_Aggregate 0x0004 /* Contains aggregate functions */
#define SF_UsesEphemeral 0x0008 /* Uses the OpenEphemeral opcode */
#define SF_Expanded 0x0010 /* sqlite3SelectExpand() called on this */
#define SF_HasTypeInfo 0x0020 /* FROM subqueries have Table metadata */
#define SF_UseSorter 0x0040 /* Sort using a sorter */
#define SF_Values 0x0080 /* Synthesized from VALUES clause */
#define SF_Materialize 0x0100 /* NOT USED */
#define SF_NestedFrom 0x0200 /* Part of a parenthesized FROM clause */
#define SF_MaybeConvert 0x0400 /* Need convertCompoundSelectToSubquery() */
#define SF_Recursive 0x0800 /* The recursive part of a recursive CTE */
/*
** The results of a SELECT can be distributed in several ways, as defined
|