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https://issues.apache.org/jira/browse/FLINK-19780?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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godfrey he reassigned FLINK-19780:
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Assignee: Caizhi Weng
> FlinkRelMdDistinctRowCount#getDistinctRowCount(Calc) will always return 0
> when number of rows are large
> -------------------------------------------------------------------------------------------------------
>
> Key: FLINK-19780
> URL: https://issues.apache.org/jira/browse/FLINK-19780
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Reporter: Caizhi Weng
> Assignee: Caizhi Weng
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.12.0
>
>
> Due to CALCITE-4351 {{FlinkRelMdDistinctRowCount#getDistinctRowCount(Calc)}}
> will always return 0 when number of rows are large.
> What I would suggest is to introduce our own
> {{FlinkRelMdUtil#numDistinctVals}} to treat small and large inputs in
> different ways. For small inputs we use the more precise
> {{RelMdUtil#numDistinctVals}} and for large inputs we copy the old,
> approximated implementation of {{RelMdUtil#numDistinctVals}}.
> This is a temporary solution. When CALCITE-4351 is fixed we should revert
> this commit.
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