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-rw-r--r--sql/sql_select.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/sql/sql_select.cc b/sql/sql_select.cc
index 60354d15091..93c3e76c047 100644
--- a/sql/sql_select.cc
+++ b/sql/sql_select.cc
@@ -13197,7 +13197,7 @@ static int test_if_order_by_key(ORDER *order, TABLE *table, uint idx,
DBUG_RETURN(0);
}
- if (key_part->field != field)
+ if (key_part->field != field || !field->part_of_sortkey.is_set(idx))
DBUG_RETURN(0);
/* set flag to 1 if we can use read-next on key, else to -1 */