MDEV-13355: Assertion `using_unique_constraint || group_buff <= param->group_buff...

The code in OIN::optimize_inner() has this call

   calc_group_buffer(this, group_list)

the call is however bypassed when the optimizer figures out that the JOIN
has "Impossible WHERE".

If we attempt to calculate the value of a window function afterwards,
we will get a crash when trying to create a temporary table.

So, put a call to calc_group_buffer() here as well. It's a bit surprising
that all these steps are done for a query that will produce zero rows
but we are just following the approach taken by the fix for mdev-11999
here.

mysql-test/r/win.result

@@ -3173,3 +3173,19 @@ Nth_value(i,1) OVER()
 1
 1
 DROP TABLE t1;
+#
+# MDEV-13355: Assertion `using_unique_constraint || group_buff <= param->group_buff + 
+#             param->group_length' failed in create_tmp_table
+#
+CREATE TABLE t1 (i INT);
+INSERT INTO t1 VALUES (1),(2);
+SELECT * FROM ( 
+SELECT 
+ROW_NUMBER() OVER(), i
+FROM t1
+WHERE 1=0
+GROUP BY i
+) AS sq
+;
+ROW_NUMBER() OVER()	i
+DROP TABLE t1;

mysql-test/t/win.test

@@ -1953,4 +1953,19 @@ UNION ALL
 ( SELECT Nth_value(i,2) OVER() FROM t1 LIMIT 0 )
 ;
 DROP TABLE t1;
-
+--echo #
+--echo # MDEV-13355: Assertion `using_unique_constraint || group_buff <= param->group_buff + 
+--echo #             param->group_length' failed in create_tmp_table
+--echo #
+CREATE TABLE t1 (i INT);
+INSERT INTO t1 VALUES (1),(2);
+ 
+SELECT * FROM ( 
+  SELECT 
+    ROW_NUMBER() OVER(), i
+    FROM t1
+    WHERE 1=0
+    GROUP BY i
+) AS sq
+;  
+DROP TABLE t1;

sql/sql_select.cc

@@ -2176,6 +2176,7 @@ setup_subq_exit:
     choose_tableless_subquery_plan();
     if (select_lex->have_window_funcs())
     {
+      calc_group_buffer(this, group_list);
       if (!(join_tab= (JOIN_TAB*) thd->alloc(sizeof(JOIN_TAB))))
         DBUG_RETURN(1);
       need_tmp= 1;