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https://issues.apache.org/jira/browse/IMPALA-12881?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Riza Suminto resolved IMPALA-12881.
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Fix Version/s: Impala 4.4.0
Resolution: Fixed
> Use JoinNode.getFkPkJoinCardinality in reduceCardinalityForScanNode
> -------------------------------------------------------------------
>
> Key: IMPALA-12881
> URL: https://issues.apache.org/jira/browse/IMPALA-12881
> Project: IMPALA
> Issue Type: Improvement
> Components: Frontend
> Reporter: Riza Suminto
> Assignee: Riza Suminto
> Priority: Major
> Fix For: Impala 4.4.0
>
>
> IMPALA-12018 adds reduceCardinalityForScanNode to lower cardinality
> estimation when runtime filter is involved. It calls
> JoinNode.computeGenericJoinCardinality(). However, if the originating join
> node has FK-PK conjunct, it should be possible to obtain lower cardinality
> estimate by calling JoinNode.getFkPkJoinCardinality() instead.
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