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Attempt the [/info/f4229707ac08d66c|constant propagation optimization] on any

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WHERE clause that has a top-level AND operator, even if the query is not
a join.  This is an attempt to partially address the concern raised in
[forum:/forumpost/830d37b928|forum post 830d37b928].

FossilOrigin-Name: e994c9f29f7a561dd5f30573865b0f793fb1388af09a2afb9b1a5b037ea52f89
This commit is contained in:
drh
2021-05-14 14:26:57 +00:00
parent 11c87895e0
commit b775c97682
3 changed files with 10 additions and 9 deletions
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5
src/select.c
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@@ -4469,7 +4469,7 @@ static void constInsert(
*/
static void findConstInWhere(WhereConst *pConst, Expr *pExpr){
Expr *pRight, *pLeft;
if( pExpr==0 ) return;
if( NEVER(pExpr==0) ) return;
if( ExprHasProperty(pExpr, EP_FromJoin) ) return;
if( pExpr->op==TK_AND ){
findConstInWhere(pConst, pExpr->pRight);
@@ -6328,7 +6328,8 @@ int sqlite3Select(
** as the equivalent optimization will be handled by query planner in
** sqlite3WhereBegin().
*/
if( pTabList->nSrc>1
if( p->pWhere!=0
&& p->pWhere->op==TK_AND
&& OptimizationEnabled(db, SQLITE_PropagateConst)
&& propagateConstants(pParse, p)
){