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Optimize trigger compilation to avoid populating the OLD.* and NEW.* pseudo-tables with data that will never be used. Some testing to come. (CVS 4651)

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FossilOrigin-Name: e08a33ed7255c22ce2805363f44a1d7770acb2dd
This commit is contained in:
danielk1977
2008-01-01 19:02:09 +00:00
parent 8ea1cfaa9a
commit 8f2c54e6e2
11 changed files with 317 additions and 57 deletions
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8
src/expr.c
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@@ -12,7 +12,7 @@
** This file contains routines used for analyzing expressions and
** for generating VDBE code that evaluates expressions in SQLite.
**
** $Id: expr.c,v 1.320 2007/12/14 15:12:21 drh Exp $
** $Id: expr.c,v 1.321 2008/01/01 19:02:09 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -1107,14 +1107,17 @@ static int lookupName(
if( zDb==0 && zTab!=0 && cnt==0 && pParse->trigStack!=0 ){
TriggerStack *pTriggerStack = pParse->trigStack;
Table *pTab = 0;
u32 *piColMask;
if( pTriggerStack->newIdx != -1 && sqlite3StrICmp("new", zTab) == 0 ){
pExpr->iTable = pTriggerStack->newIdx;
assert( pTriggerStack->pTab );
pTab = pTriggerStack->pTab;
piColMask = &(pTriggerStack->newColMask);
}else if( pTriggerStack->oldIdx != -1 && sqlite3StrICmp("old", zTab)==0 ){
pExpr->iTable = pTriggerStack->oldIdx;
assert( pTriggerStack->pTab );
pTab = pTriggerStack->pTab;
piColMask = &(pTriggerStack->oldColMask);
}
if( pTab ){
@@ -1133,6 +1136,9 @@ static int lookupName(
pExpr->pColl = sqlite3FindCollSeq(db, ENC(db), zColl,-1, 0);
}
pExpr->pTab = pTab;
if( iCol>=0 ){
*piColMask |= ((u32)1<<iCol) | (iCol>=32?0xffffffff:0);
}
break;
}
}