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-rw-r--r--sql/sql_union.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/sql/sql_union.cc b/sql/sql_union.cc
index 6e8c2ebdb5c..1bad04c3d67 100644
--- a/sql/sql_union.cc
+++ b/sql/sql_union.cc
@@ -216,7 +216,7 @@ int st_select_lex_unit::exec()
if (optimized && item && item->assigned())
{
item->assigned(0); // We will reinit & rexecute unit
- item->assign_null();
+ item->reset();
table->file->delete_all_rows();
}
for (SELECT_LEX *sl= first_select(); sl; sl= sl->next_select())