At file:///home/psergey/dev/mysql-next-fix-subq/
------------------------------------------------------------
revno: 2819
revision-id: psergey@askmonty.org-20090708174703-dz9uf5b0m6pcvtl6
parent: psergey@askmonty.org-20090708095341-9i08n2r8igulpxzz
committer: Sergey Petrunya
branch nick: mysql-next-fix-subq
timestamp: Wed 2009-07-08 21:47:03 +0400
message:
BUG#31480: Incorrect result for nested subquery when executed via semi join
Make the fix work with prepared statements:
- in previous cset changed calloc to alloc, forgot to add bzero.
=== modified file 'sql/item_subselect.cc'
--- a/sql/item_subselect.cc 2009-07-08 09:53:41 +0000
+++ b/sql/item_subselect.cc 2009-07-08 17:47:03 +0000
@@ -180,10 +180,11 @@
if (!ancestor_used_tables)
{
set_depth();
- if (!(ancestor_used_tables=
- (table_map*)alloc_root(thd->stmt_arena->mem_root,
- (1+depth)*sizeof(table_map))))
+ size_t size= (1+depth) * sizeof(table_map);
+ if (!(ancestor_used_tables= (table_map*)
+ alloc_root(thd->stmt_arena->mem_root, size)))
return TRUE;
+ bzero(ancestor_used_tables, size);
furthest_correlated_ancestor= 0;
inside_first_fix_fields= TRUE;
}
@@ -258,7 +259,7 @@
is_correlated= TRUE;
furthest_correlated_ancestor= max(furthest_correlated_ancestor, n_levels);
if (n_levels > 1)
- ancestor_used_tables[n_levels - 2]= dep_map;
+ ancestor_used_tables[n_levels - 2] |= dep_map;
}
}
