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https://issues.apache.org/jira/browse/HIVE-513?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12713740#action_12713740
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Zheng Shao commented on HIVE-513:
---------------------------------
Are you working on the latest trunk? There was a recent change that might have
fixed it.
We remove redundant conversion functions at compile time.
I tried "select cast('my string' as string) from mytable;" with the latest
trunk and it correctly outputs "my string".
> 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
> Assignee: Min Zhou
> Attachments: HIVE-513.patch
>
>
> execute a query like below,
> {noformat}
> select cast('my string' as string) 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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