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Enable the EXISTS-to-JOIN optimization if the outer query has no

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FROM clause.

FossilOrigin-Name: 1b9b124f9a35ebd1ac4ea70ef1ee08a4c82c11da690d4164f6b785a6fd9730d9
This commit is contained in:
drh
2025-07-08 17:28:09 +00:00
parent 8c8443a38a
commit 449b34571e
4 changed files with 14 additions and 12 deletions
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9
src/build.c
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@@ -5138,6 +5138,9 @@ void sqlite3SrcListIndexedBy(Parse *pParse, SrcList *p, Token *pIndexedBy){
*/
SrcList *sqlite3SrcListAppendList(Parse *pParse, SrcList *p1, SrcList *p2){
assert( p1 );
assert( p2 || pParse->nErr );
assert( p2==0 || p2->nSrc>=1 );
testcase( p1->nSrc==0 );
if( p2 ){
int nOld = p1->nSrc;
SrcList *pNew = sqlite3SrcListEnlarge(pParse, p1, p2->nSrc, nOld);
@@ -5146,10 +5149,10 @@ SrcList *sqlite3SrcListAppendList(Parse *pParse, SrcList *p1, SrcList *p2){
}else{
p1 = pNew;
memcpy(&p1->a[nOld], p2->a, p2->nSrc*sizeof(SrcItem));
assert( nOld==1 || (p2->nSrc==1 && (p2->a[0].fg.jointype&JT_LTORJ)==0) );
assert( p1->nSrc>=2 );
assert( nOld==1 || (p2->a[0].fg.jointype & JT_LTORJ)==0 );
assert( p1->nSrc>=1 );
p1->a[0].fg.jointype |= (JT_LTORJ & p2->a[0].fg.jointype);
sqlite3DbFree(pParse->db, p2);
p1->a[0].fg.jointype |= (JT_LTORJ & p1->a[1].fg.jointype);
}
}
return p1;

1
src/select.c
View File

@@ -7432,7 +7432,6 @@ static SQLITE_NOINLINE void existsToJoin(
){
if( pWhere
&& !ExprHasProperty(pWhere, EP_OuterON|EP_InnerON)
&& p->pSrc->nSrc>0
&& p->pSrc->nSrc<BMS
&& pParse->db->mallocFailed==0
){