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Performance optimization (and size reduction) in sqlite3TriggerList() for the

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common case where there are no TEMP triggers.

FossilOrigin-Name: 0defaf730bdc82212a5d3feeb2e16f16423b1691b0aaa7da1787eb82ea39ae9e
This commit is contained in:
drh
2021-01-29 13:47:36 +00:00
parent 16cd8b96d3
commit f54a80fe5c
3 changed files with 20 additions and 17 deletions
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22
src/trigger.c
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@@ -48,28 +48,32 @@ void sqlite3DeleteTriggerStep(sqlite3 *db, TriggerStep *pTriggerStep){
** pTab as well as the triggers lised in pTab->pTrigger.
*/
Trigger *sqlite3TriggerList(Parse *pParse, Table *pTab){
Schema * const pTmpSchema = pParse->db->aDb[1].pSchema;
Trigger *pList = 0; /* List of triggers to return */
Schema *pTmpSchema; /* Schema of the pTab table */
Trigger *pList; /* List of triggers to return */
HashElem *p; /* Loop variable for TEMP triggers */
if( pParse->disableTriggers ){
return 0;
}
pTmpSchema = pParse->db->aDb[1].pSchema;
p = sqliteHashFirst(&pTmpSchema->trigHash);
if( p==0 ){
return pTab->pTrigger;
}
pList = pTab->pTrigger;
if( pTmpSchema!=pTab->pSchema ){
HashElem *p;
assert( sqlite3SchemaMutexHeld(pParse->db, 0, pTmpSchema) );
for(p=sqliteHashFirst(&pTmpSchema->trigHash); p; p=sqliteHashNext(p)){
while( p ){
Trigger *pTrig = (Trigger *)sqliteHashData(p);
if( pTrig->pTabSchema==pTab->pSchema
&& 0==sqlite3StrICmp(pTrig->table, pTab->zName)
){
pTrig->pNext = (pList ? pList : pTab->pTrigger);
pTrig->pNext = pList;
pList = pTrig;
}
p = sqliteHashNext(p);
}
}
return (pList ? pList : pTab->pTrigger);
return pList;
}
/*