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https://issues.apache.org/jira/browse/HIVE-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13459383#comment-13459383
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Navis commented on HIVE-3491:
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I've also tried similar thing for UDAF(HIVE-2964), and resigned because it was
too confusional(MAP-AGGR, etc.). But for UDF, it seemed possible.
> Expose column names to UDFs
> ---------------------------
>
> Key: HIVE-3491
> URL: https://issues.apache.org/jira/browse/HIVE-3491
> Project: Hive
> Issue Type: New Feature
> Components: Query Processor, UDF
> Reporter: Adam Kramer
>
> If I run
> SELECT MY_FUNC(a.foo, b.bar) FROM baz1 a JOIN baz2 b;
> ...the parsed query structure (i.e., that "foo" and "bar" are the name of the
> columns) should be available to the UDF in some manner.
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