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https://issues.apache.org/jira/browse/HIVE-12223?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989736#comment-14989736
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Ashutosh Chauhan commented on HIVE-12223:
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+1 LGTM
> Filter on Grouping__ID does not work properly
> ---------------------------------------------
>
> Key: HIVE-12223
> URL: https://issues.apache.org/jira/browse/HIVE-12223
> Project: Hive
> Issue Type: Bug
> Components: Logical Optimizer
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Fix For: 1.3.0, 2.0.0
>
> Attachments: HIVE-12223.01.patch, HIVE-12223.patch
>
>
> Consider the following query:
> {noformat}
> SELECT key, value, GROUPING__ID, count(*)
> FROM T1
> GROUP BY key, value
> GROUPING SETS ((), (key))
> HAVING GROUPING__ID = 1
> {noformat}
> This query will not return results.
> The reason is that a "constant" placeholder is introduced by SemanticAnalyzer
> for the GROUPING\__ID column. At execution time, this placeholder is replaced
> by the actual value of the GROUPING\__ID. As the column is a constant, the
> Hive optimizer (combination of PPD and constant folding) will evaluate
> statically whether the condition is met or not, leading to incorrect results.
> We should be able to recognize the placeholder and avoid PPD pushing the
> filter predicate to the GroupBy operator.
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