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https://issues.apache.org/jira/browse/CALCITE-3590?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16993782#comment-16993782
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Rui Wang commented on CALCITE-3590:
-----------------------------------
This is also useful for large data processing engine. There is a common case
that a hot key exist, which causes troubles on execution engine. Hint on
aggregation can be used to provide what are hot keys, and engines can handle
those separately.
> Support SQL hints for Aggregate.
> --------------------------------
>
> Key: CALCITE-3590
> URL: https://issues.apache.org/jira/browse/CALCITE-3590
> Project: Calcite
> Issue Type: Sub-task
> Components: core
> Affects Versions: 1.21.0
> Reporter: Shuo Cheng
> Priority: Major
> Fix For: 1.22.0
>
>
> Currently in CALCITE-482, hints are only supported for Project, Join and
> TableScan. It's also necessary to support hints for Aggregate so as to enable
> fine grained Aggregate configuration, e.g., two-stage-aggregation.
> SELECT /*+ TWO_STAGE_AGG(true) */
> dep_id,
> grade,
> avg(annual_salary),
> min(annual_salary),
> max(annual_salary)
> FROM T
> GROUP BY dep_id, grade;
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