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https://issues.apache.org/jira/browse/HIVE-2750?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13193555#comment-13193555
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Namit Jain commented on HIVE-2750:
----------------------------------
+1
> Hive multi group by single reducer optimization causes invalid column
> reference error
> -------------------------------------------------------------------------------------
>
> Key: HIVE-2750
> URL: https://issues.apache.org/jira/browse/HIVE-2750
> Project: Hive
> Issue Type: Bug
> Reporter: Kevin Wilfong
> Assignee: Kevin Wilfong
> Attachments: HIVE-2750.D1455.1.patch
>
>
> After the optimization, if two query blocks have the same distinct clause and
> the same group by keys, but the first query block does not reference all the
> rows the second query block does, an invalid column reference error is raised
> for the columns unreferenced in the first query block.
> E.g.
> FROM src
> INSERT OVERWRITE TABLE dest_g2 SELECT substr(src.key,1,1), count(DISTINCT
> src.key) WHERE substr(src.key,1,1) >= 5 GROUP BY substr(src.key,1,1)
> INSERT OVERWRITE TABLE dest_g3 SELECT substr(src.key,1,1), count(DISTINCT
> src.key), count(src.value) WHERE substr(src.key,1,1) < 5 GROUP BY
> substr(src.key,1,1);
> This results in an invalid column reference error on src.value
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