Move size, if, isnull, isnotnull to GenericUDF
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Key: HIVE-521
URL: https://issues.apache.org/jira/browse/HIVE-521
Project: Hadoop Hive
Issue Type: Improvement
Affects Versions: 0.4.0
Reporter: Zheng Shao
Fix For: 0.4.0
See HIVE-511 for an example of the move.
size, if, isnull, isnotnull are all implemented with UDF but they are actually
working on variable types of objects. We should move them to GenericUDF for
better type handling.
This also helps to clean up the hack in doing type matching/type conversion in
UDF.
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