[HIVE-27950] STACK UDTF returns wrong results when # of argument is not a multiple of N

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 4.0.0-beta-1
• Fix Version/s: 4.0.0
• Labels: pull-request-available
• Assignee: Shohei Okumiya
• Reporter: Shohei Okumiya
• Created: 11/Dec/23 22:49
• Updated: 29/Mar/24 17:49
• Resolved: 20/Feb/24 05:20

Description

GenericUDTFStack nullifies a wrong cell when the number of values is indivisible. In the following case, the `col2` column of the last row should be `NULL`. But, `col1` is NULL somehow. 

0: jdbc:hive2://hive-hiveserver2:10000/defaul> select stack(2, 'a', 'b', 'c', 'd', 'e');
+-------+-------+-------+
| col0  | col1  | col2  |
+-------+-------+-------+
| a     | b     | c     |
| d     | NULL  | c     |
+-------+-------+-------+

Issue Links

• links to: GitHub Pull Request #4938