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https://issues.apache.org/jira/browse/HIVE-3729?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13502096#comment-13502096
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Harish Butani commented on HIVE-3729:
-------------------------------------
Fix is to remove the reference to groupByExpression in the empty groupingSet
alternative.
This doesn't fix the warnings because of the multiple alternatives.
Looked at the NFA in Antlrworks; appears to me that antlr will do the right
thing anyways.
So this is a cosmetic issue. But someone else should look at it also.
> Error in groupSetExpression rule in Hive grammar
> ------------------------------------------------
>
> Key: HIVE-3729
> URL: https://issues.apache.org/jira/browse/HIVE-3729
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.10.0
> Environment: All
> Reporter: Harish Butani
> Priority: Minor
> Fix For: 0.10.0
>
> Original Estimate: 5m
> Remaining Estimate: 5m
>
> Here is the error:
> Hive.g:1902:38: reference to rewrite element groupByExpression without
> reference on left of ->
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