Aaron Tokhy created HIVE-12502:
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Summary: to_date UDF cannot accept NULLs of VOID type
Key: HIVE-12502
URL: https://issues.apache.org/jira/browse/HIVE-12502
Project: Hive
Issue Type: Bug
Components: UDF
Affects Versions: 1.0.0
Reporter: Aaron Tokhy
Assignee: Jason Dere
Priority: Trivial
The to_date method behaves differently based off the 'data type' of null passed
in.
hive> select to_date(null);
FAILED: SemanticException [Error 10014]: Line 1:7 Wrong arguments 'TOK_NULL':
TO_DATE() only takes STRING/TIMESTAMP/DATEWRITABLE types, got VOID
hive> select to_date(cast(null as timestamp));
OK
NULL
Time taken: 0.031 seconds, Fetched: 1 row(s)
This appears to be a regression introduced in HIVE-5731. The previous version
of to_date would not check the type:
https://github.com/apache/hive/commit/09b6553214d6db5ec7049b88bbe8ff640a7fef72#diff-204f5588c0767cf372a5ca7e3fb964afL56
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