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https://issues.apache.org/jira/browse/HIVE-8988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14244585#comment-14244585
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Julian Hyde commented on HIVE-8988:
-----------------------------------
$Foo is probably not interesting to end-users, so let's keep it in Hive. You
should sub-class SqlInternalOperator. In SqlStdOperatorTable, you'll see
$SLICE, $ELEMENT_SLICE, $SCALAR_QUERY and EXTEND are all examples of it.
> Support advanced aggregation in Hive to Calcite path
> -----------------------------------------------------
>
> Key: HIVE-8988
> URL: https://issues.apache.org/jira/browse/HIVE-8988
> Project: Hive
> Issue Type: Improvement
> Affects Versions: 0.15.0
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Labels: grouping, logical, optiq
> Fix For: 0.15.0
>
> Attachments: HIVE-8988.01.patch, HIVE-8988.patch
>
>
> CLEAR LIBRARY CACHE
> To close the gap between Hive and Calcite, we need to support the translation
> of GroupingSets into Calcite; currently this is not implemented.
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