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https://issues.apache.org/jira/browse/FLINK-8739?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16706595#comment-16706595
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Dian Fu commented on FLINK-8739:
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[~walterddr] Thanks a lot. I'll provide a PR ASAP and looking forward to your
review.
> Optimize runtime support for distinct filter
> --------------------------------------------
>
> Key: FLINK-8739
> URL: https://issues.apache.org/jira/browse/FLINK-8739
> Project: Flink
> Issue Type: Improvement
> Components: Table API & SQL
> Reporter: Rong Rong
> Priority: Major
>
> Possible optimizaitons:
> 1. Decouple distinct map and actual accumulator so that they can separately
> be created in codegen.
> 2. Reuse same distinct accumulator for filtering, e.g. `SELECT
> COUNT(DISTINCT(a)), SUM(DISTINCT(a))` should reuse the same distinct map.
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