MDEV-9676: RANGE-type frames for window functions

Add testcases for RANGE UNBOUNDED PRECEDING|FOLLOWING

mysql-test/r/win.result

@@ -567,4 +567,94 @@ part_id	pk	val	CNT
 5678	206	2	4
 5678	207	3	2
 5678	208	3	2
+#
+# Try RANGE UNBOUNDED PRECEDING | FOLLOWING
+#
+select 
+part_id,
+pk, 
+val,
+count(val) over (partition by part_id
+order by val 
+range between unbounded preceding and 
+current row) 
+as CNT
+from t4;
+part_id	pk	val	CNT
+1234	100	1	3
+1234	101	1	3
+1234	102	1	3
+1234	103	2	7
+1234	104	2	7
+1234	105	2	7
+1234	106	2	7
+1234	107	3	9
+1234	108	3	9
+5678	200	1	3
+5678	201	1	3
+5678	202	1	3
+5678	203	2	7
+5678	204	2	7
+5678	205	2	7
+5678	206	2	7
+5678	207	3	9
+5678	208	3	9
+select 
+part_id,
+pk, 
+val,
+count(val) over (partition by part_id
+order by val 
+range between current row and 
+unbounded following) 
+as CNT
+from t4;
+part_id	pk	val	CNT
+1234	100	1	9
+1234	101	1	9
+1234	102	1	9
+1234	103	2	6
+1234	104	2	6
+1234	105	2	6
+1234	106	2	6
+1234	107	3	2
+1234	108	3	2
+5678	200	1	9
+5678	201	1	9
+5678	202	1	9
+5678	203	2	6
+5678	204	2	6
+5678	205	2	6
+5678	206	2	6
+5678	207	3	2
+5678	208	3	2
+select 
+part_id,
+pk, 
+val,
+count(val) over (partition by part_id
+order by val 
+range between unbounded preceding and 
+unbounded following) 
+as CNT
+from t4;
+part_id	pk	val	CNT
+1234	100	1	9
+1234	101	1	9
+1234	102	1	9
+1234	103	2	9
+1234	104	2	9
+1234	105	2	9
+1234	106	2	9
+1234	107	3	9
+1234	108	3	9
+5678	200	1	9
+5678	201	1	9
+5678	202	1	9
+5678	203	2	9
+5678	204	2	9
+5678	205	2	9
+5678	206	2	9
+5678	207	3	9
+5678	208	3	9
 drop table t4;

mysql-test/t/win.test

@@ -384,5 +384,41 @@ select
   as CNT
 from t4;
 
+--echo #
+--echo # Try RANGE UNBOUNDED PRECEDING | FOLLOWING
+--echo #
+select 
+  part_id,
+  pk, 
+  val,
+  count(val) over (partition by part_id
+                   order by val 
+                   range between unbounded preceding and 
+                               current row) 
+  as CNT
+from t4;
+
+select 
+  part_id,
+  pk, 
+  val,
+  count(val) over (partition by part_id
+                   order by val 
+                   range between current row and 
+                                 unbounded following) 
+  as CNT
+from t4;
+
+select 
+  part_id,
+  pk, 
+  val,
+  count(val) over (partition by part_id
+                   order by val 
+                   range between unbounded preceding and 
+                                 unbounded following) 
+  as CNT
+from t4;
+
 drop table t4;