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Back out the EXISTS-to-IN optimization. It slows things down rather than

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speeds them up depending on the query.  And (see
[forum:/forumpost/8692d94725|forum post 8692d94725]) it sometimes results in
an incorrect answer.  We may come back and revisit this optimization later,
but for now it seems best just to disable it.

FossilOrigin-Name: 16252d73fa73569fd7506676f6ffbbcd43addfb105384fb74449d30ca720904a
This commit is contained in:
drh
2021-05-04 12:07:16 +00:00
parent f83d501c6d
commit 433a3e935d
7 changed files with 11 additions and 549 deletions
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13
src/expr.c
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@@ -95,18 +95,7 @@ Expr *sqlite3ExprAddCollateToken(
const Token *pCollName, /* Name of collating sequence */
int dequote /* True to dequote pCollName */
){
assert( pExpr!=0 || pParse->db->mallocFailed );
if( pExpr==0 ) return 0;
if( pExpr->op==TK_VECTOR ){
ExprList *pList = pExpr->x.pList;
if( ALWAYS(pList!=0) ){
int i;
for(i=0; i<pList->nExpr; i++){
pList->a[i].pExpr = sqlite3ExprAddCollateToken(pParse,pList->a[i].pExpr,
pCollName, dequote);
}
}
}else if( pCollName->n>0 ){
if( pCollName->n>0 ){
Expr *pNew = sqlite3ExprAlloc(pParse->db, TK_COLLATE, pCollName, dequote);
if( pNew ){
pNew->pLeft = pExpr;