mdayakar commented on code in PR #5978:
URL: https://github.com/apache/hive/pull/5978#discussion_r2209978872


##########
ql/src/test/queries/clientpositive/udtf_with_unionall.q:
##########
@@ -0,0 +1,55 @@
+SELECT STACK(3,'A',10,date '2015-01-01','z','B',20,date 
'2016-01-01','y','C',30,date '2017-08-09','x') AS (col0,col1,col2,col3)
+  UNION ALL
+ SELECT STACK(3,'A',10,date '2015-01-01','n','B',20,date 
'2016-01-01','m','C',30,date '2017-08-09','l') AS (col0,col1,col2,col3);
+
+EXPLAIN SELECT stack(3,'A',10,date '2015-01-01','z','B',20,date 
'2016-01-01','y','C',30,date '2017-08-09','x') AS (col0,col1,col2,col3)
+  UNION ALL
+ SELECT STACK(3,'A',10,date '2015-01-01','n','B',20,date 
'2016-01-01','m','C',30,date '2017-08-09','l') AS (col0,col1,col2,col3);
+
+SELECT * FROM (VALUES(1, '1'), (2, 'orange'), (5, 'yellow')) AS Colors1
+  UNION ALL
+ SELECT * FROM (VALUES(10, 'green'), (11, 'blue'), (12, 'indigo'), (20, 
'violet')) AS Colors2
+  UNION ALL
+ SELECT STACK(2,10,'X',20,'Y');
+
+EXPLAIN SELECT * FROM (VALUES(1, '1'), (2, 'orange'), (5, 'yellow')) AS Colors1

Review Comment:
   Used `EXPLAIN CBO` now.



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