MDEV-15846: Sever crashed with MEDIAN() window function

Fixed by MDEV-15902, just added the test case for this issue.

mysql-test/main/win_percentile.result

@@ -339,3 +339,12 @@ MEDIAN(f3) OVER ()
 112.0000000000
 112.0000000000
 DROP TABLE t1;
+#
+# MDEV-15846: Sever crashed with MEDIAN() window function
+#
+CREATE TABLE t1 ( pk int PRIMARY KEY, a1 int, a2 int);
+SELECT MEDIAN(`a1`) OVER (),
+MEDIAN(`a2`) OVER (PARTITION BY `pk`)
+FROM t1;
+MEDIAN(`a1`) OVER ()	MEDIAN(`a2`) OVER (PARTITION BY `pk`)
+DROP TABLE t1;

mysql-test/main/win_percentile.test

@@ -115,5 +115,15 @@ INSERT INTO t1(f1,f2,f3,f4) VALUES
 WITH CTE AS (SELECT MIN(f3) OVER () FROM t1)
 SELECT  MEDIAN(f3) OVER () FROM t1
 ORDER BY f1, f2, f3, f4, v1;
+DROP TABLE t1;
+
+--echo #
+--echo # MDEV-15846: Sever crashed with MEDIAN() window function
+--echo #
+
+CREATE TABLE t1 ( pk int PRIMARY KEY, a1 int, a2 int);
 
+SELECT MEDIAN(`a1`) OVER (),
+       MEDIAN(`a2`) OVER (PARTITION BY `pk`)
+FROM t1;
 DROP TABLE t1;