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Disallow the one-pass optimization for DELETE if the WHERE clause contains

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a subquery.  Fix for the problem reported by
[forum:/forumpost/e61252062c9d286d|forum post e61252062c9d286d].  This fix
is more restrictive than necessary.  It could be relaxed if the subquery does
not involve the table that is the subject of the DELETE.

FossilOrigin-Name: 73f0036f045bf37193b6e87ae45b578c5831614c530488257c69666178da3aa5
This commit is contained in:
drh
2023-03-15 17:58:51 +00:00
parent eb5d71ed58
commit ffcad5893a
6 changed files with 35 additions and 14 deletions
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2
src/delete.c
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@@ -483,7 +483,7 @@ void sqlite3DeleteFrom(
#endif /* SQLITE_OMIT_TRUNCATE_OPTIMIZATION */
{
u16 wcf = WHERE_ONEPASS_DESIRED|WHERE_DUPLICATES_OK;
if( sNC.ncFlags & NC_VarSelect ) bComplex = 1;
if( sNC.ncFlags & NC_Subquery ) bComplex = 1;
wcf |= (bComplex ? 0 : WHERE_ONEPASS_MULTIROW);
if( HasRowid(pTab) ){
/* For a rowid table, initialize the RowSet to an empty set */