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https://issues.apache.org/jira/browse/FLINK-19896?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jun Zhang updated FLINK-19896:
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Component/s: Table SQL / Planner
> Support first-n-rows deduplication in the Deduplicate operator
> --------------------------------------------------------------
>
> Key: FLINK-19896
> URL: https://issues.apache.org/jira/browse/FLINK-19896
> Project: Flink
> Issue Type: Improvement
> Components: Table SQL / Planner, Table SQL / Runtime
> Affects Versions: 1.12.0, 1.11.3
> Reporter: Jun Zhang
> Priority: Major
> Fix For: 1.11.2
>
>
> Currently Deduplicate operator only supports first-row deduplication (ordered
> by proc-time). In scenario of first-n-rows deduplication, the planner has to
> resort to Rank operator. However, Rank operator is less efficient than
> Deduplicate in terms of state consumption.
> This issue proposes to extend DeduplicateKeepFirstRowFunction to support
> first-n-rows deduplication.
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