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Restore part of the UPDATE one-pass optimization that was removed by

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check-in [2c56b984a0bd3be5]: only disable one-pass if the WHERE clause
contains a subquery.  Allow subqueries in the SET expressions.
Fix for performance problem reported by
[forum:/forumpost/8ab195fd44e75ed0|forum  post 8ab195fd44e75ed0].

FossilOrigin-Name: 42916af9fc0f379a608a08db894400bd735a28e26ab1ffd604d1fddfbdb3ec0c
This commit is contained in:
drh
2023-08-01 00:34:03 +00:00
parent 00d635dda4
commit d192b4441d
6 changed files with 35 additions and 11 deletions
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2
src/update.c
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@@ -741,7 +741,7 @@ void sqlite3Update(
&& !hasFK
&& !chngKey
&& !bReplace
&& (sNC.ncFlags & NC_Subquery)==0
&& (pWhere==0 || !ExprHasProperty(pWhere, EP_Subquery))
){
flags |= WHERE_ONEPASS_MULTIROW;
}