okumin created HIVE-22601:
-----------------------------
Summary: Some columns will be lost when a UDTF has multiple
aliases in some cases
Key: HIVE-22601
URL: https://issues.apache.org/jira/browse/HIVE-22601
Project: Hive
Issue Type: Bug
Components: Query Processor
Affects Versions: 3.1.2
Reporter: okumin
Assignee: okumin
Only one column will be retained when putting UDTFs with multiple aliases and a
top-level UNION together.
For example, the result of the following SQL should have three columns, c1, c2
and c3.
{code:java}
SELECT stack(1, 'a', 'b', 'c') AS (c1, c2, c3)
UNION ALL
SELECT stack(1, 'd', 'e', 'f') AS (c1, c2, c3);
{code}
However, It's only the c3 column which I can get.
{code:java}
+---------+
| _u1.c3 |
+---------+
| c |
| f |
+---------+
{code}
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