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https://issues.apache.org/jira/browse/HIVE-5306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13772158#comment-13772158
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Jason Dere commented on HIVE-5306:
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As mentioned in the first comment, for non-generic UDFs it does attempt to see
if the input argument can be mapped to one of the supported argument types. So
it should work for float/string:
hive> create view view1 as select abs('1'), abs(cast(1.0 as float)) from src
limit 1;
OK
Time taken: 0.099 seconds
hive> describe view1;
OK
_c0 double None
_c1 double None
Time taken: 0.055 seconds, Fetched: 2 row(s)
> Use new GenericUDF instead of basic UDF for UDFAbs class
> --------------------------------------------------------
>
> Key: HIVE-5306
> URL: https://issues.apache.org/jira/browse/HIVE-5306
> Project: Hive
> Issue Type: Improvement
> Components: UDF
> Reporter: Mohammad Kamrul Islam
> Assignee: Mohammad Kamrul Islam
> Attachments: HIVE-5306.1.patch, HIVE-5306.2.patch, HIVE-5306.3.patch,
> HIVE-5306.4.patch
>
>
> GenericUDF class is the latest and recommended base class for any UDFs.
> This JIRA is to change the current UDFAbs class extended from GenericUDF.
> The general benefit of GenericUDF is described in comments as
> "* The GenericUDF are superior to normal UDFs in the following ways: 1. It can
> * accept arguments of complex types, and return complex types. 2. It can
> accept
> * variable length of arguments. 3. It can accept an infinite number of
> function
> * signature - for example, it's easy to write a GenericUDF that accepts
> * array<int>, array<array<int>> and so on (arbitrary levels of nesting). 4.
> It
> * can do short-circuit evaluations using DeferedObject."
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