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https://issues.apache.org/jira/browse/FLINK-23107?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17377003#comment-17377003
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Shuo Cheng commented on FLINK-23107:
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cc [~lzljs3620320], I'll take this Jira.
> Separate deduplicate rank from rank functions
> ---------------------------------------------
>
> Key: FLINK-23107
> URL: https://issues.apache.org/jira/browse/FLINK-23107
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Runtime
> Reporter: Jingsong Lee
> Priority: Major
> Fix For: 1.14.0
>
>
> SELECT * FROM (SELECT *, ROW_NUMBER() OVER (PARTITION BY d ORDER BY e DESC)
> AS rownum from T) WHERE rownum=1
> Actually above sql is a deduplicate rank instead of a normal rank. We should
> separate the implementation for optimize the deduplicate rank and reduce bugs.
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