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https://issues.apache.org/jira/browse/SAMZA-1535?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16288453#comment-16288453
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Srinivasulu Punuru commented on SAMZA-1535:
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https://github.com/apache/samza/pull/386
> Support UDFS in where clause
> ----------------------------
>
> Key: SAMZA-1535
> URL: https://issues.apache.org/jira/browse/SAMZA-1535
> Project: Samza
> Issue Type: Bug
> Reporter: Srinivasulu Punuru
>
> The existing version of the udf implementation doesn't seem to supported in
> the where clauses because the Type of the object returned is "ANY" and when
> you do a
> select * from kafka.topic where regexMatch('.*foo', Name) it fails in the
> query validation, because calcite doesn't know the type of regexMatch.
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