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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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16
src/trigger.c
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@@ -751,6 +751,13 @@ static int codeTriggerProgram(
** a row containing values to be substituted for old.* expressions in the
** trigger program(s).
**
** If they are not NULL, the piOldColMask and piNewColMask output variables
** are set to values that describe the columns used by the trigger program
** in the OLD.* and NEW.* tables respectively. If column N of the
** pseudo-table is read at least once, the corresponding bit of the output
** mask is set. If a column with an index greater than 32 is read, the
** output mask is set to the special value 0xffffffff.
**
*/
int sqlite3CodeRowTrigger(
Parse *pParse, /* Parse context */
@@ -761,11 +768,16 @@ int sqlite3CodeRowTrigger(
int newIdx, /* The indice of the "new" row to access */
int oldIdx, /* The indice of the "old" row to access */
int orconf, /* ON CONFLICT policy */
int ignoreJump /* Instruction to jump to for RAISE(IGNORE) */
int ignoreJump, /* Instruction to jump to for RAISE(IGNORE) */
u32 *piOldColMask, /* OUT: Mask of columns used from the OLD.* table */
u32 *piNewColMask /* OUT: Mask of columns used from the NEW.* table */
){
Trigger *p;
TriggerStack trigStackEntry;
trigStackEntry.oldColMask = 0;
trigStackEntry.newColMask = 0;
assert(op == TK_UPDATE || op == TK_INSERT || op == TK_DELETE);
assert(tr_tm == TRIGGER_BEFORE || tr_tm == TRIGGER_AFTER );
@@ -835,6 +847,8 @@ int sqlite3CodeRowTrigger(
sqlite3VdbeResolveLabel(pParse->pVdbe, endTrigger);
}
}
if( piOldColMask ) *piOldColMask |= trigStackEntry.oldColMask;
if( piNewColMask ) *piNewColMask |= trigStackEntry.newColMask;
return 0;
}
#endif /* !defined(SQLITE_OMIT_TRIGGER) */