diff options
Diffstat (limited to 'sql/item_sum.cc')
| -rw-r--r-- | sql/item_sum.cc | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/sql/item_sum.cc b/sql/item_sum.cc index 51754fbd9ee..2479f8ea92a 100644 --- a/sql/item_sum.cc +++ b/sql/item_sum.cc @@ -1049,9 +1049,10 @@ bool Item_sum_distinct::unique_walk_function(void *element) void Item_sum_distinct::clear() { DBUG_ENTER("Item_sum_distinct::clear"); - DBUG_ASSERT(tree != 0); /* we always have a tree */ + /* During EXPLAIN there is no tree because it is created during execution. */ + if (tree != 0) + tree->reset(); null_value= 1; - tree->reset(); is_evaluated= FALSE; DBUG_VOID_RETURN; } |