UDFToString bug
---------------
Key: HIVE-513
URL: https://issues.apache.org/jira/browse/HIVE-513
Project: Hadoop Hive
Issue Type: Bug
Components: Query Processor
Reporter: Min Zhou
execute a query like below,
{noformat}
select cast('my string' as tring) from pokes;
{noformat}
you will get the result:
{noformat}
NULL
NULL
...
{noformat}
the reason is UDFToString hasn't an evaluate method acceptes Text or
BytesWritable argument.
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