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Window functions can have an empty over clause

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Make sure we select one window function if we have an empty over clause.
This commit is contained in:
Vicențiu Ciorbaru
2016-09-24 15:25:00 +02:00
parent 45faae60b7
commit de2175e96a
1 changed files with 2 additions and 2 deletions
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4
sql/sql_window.cc
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@@ -2663,14 +2663,14 @@ bool Window_funcs_sort::setup(THD *thd, SQL_SELECT *sel,
Window_spec *spec; Window_spec *spec;
Item_window_func *win_func= it.peek(); Item_window_func *win_func= it.peek();
Item_window_func *win_func_with_longest_order= NULL; Item_window_func *win_func_with_longest_order= NULL;
uint longest_order_elements= 0; int longest_order_elements= -1;
/* The iterator should point to a valid function at the start of execution. */ /* The iterator should point to a valid function at the start of execution. */
DBUG_ASSERT(win_func); DBUG_ASSERT(win_func);
do do
{ {
spec= win_func->window_spec; spec= win_func->window_spec;
uint win_func_order_elements= spec->partition_list->elements + int win_func_order_elements= spec->partition_list->elements +
spec->order_list->elements; spec->order_list->elements;
if (win_func_order_elements > longest_order_elements) if (win_func_order_elements > longest_order_elements)
{ {