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https://issues.apache.org/jira/browse/HIVE-521?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12714950#action_12714950
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Min Zhou commented on HIVE-521:
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Thanks, Zheng
1. Do you mean queries like below ?
select if(true, null , null) from tbl
I believe GenericUDFWhen also has that problem, try
select case when true then null else null end from tbl
2. Some excpetion throws when initializing actually is not a type exception,
but an exception on arguments' length. Signature for method initialize() is
not fit for every situation, I think.
public ObjectInspector initialize(ObjectInspector[] arguments)
throws UDFArgumentTypeException;
3. please check https://issues.apache.org/jira/browse/HIVE-512, I thought there
are more inconvenience in GenericUDF.
> Move size, if, isnull, isnotnull to GenericUDF
> ----------------------------------------------
>
> 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
> Assignee: Min Zhou
> Fix For: 0.4.0
>
> Attachments: HIVE-521-IF-2.patch, HIVE-521-IF.patch
>
>
> 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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