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-rw-r--r--sql/sql_select.cc2
1 files changed, 2 insertions, 0 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index bf5ed800a1d..41fb4cd0f25 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -20152,6 +20152,8 @@ copy_fields(TMP_TABLE_PARAM *param)
Copy_field *ptr=param->copy_field;
Copy_field *end=param->copy_field_end;
+ DBUG_ASSERT((ptr != NULL && end >= ptr) || (ptr == NULL && end == NULL));
+
for (; ptr != end; ptr++)
(*ptr->do_copy)(ptr);