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https://issues.apache.org/jira/browse/FLINK-21946?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jark Wu reassigned FLINK-21946:
-------------------------------
Assignee: lincoln lee
> FlinkRelMdUtil.numDistinctVals produces exceptional Double.NaN result when
> domainSize is in range(0,1)
> -------------------------------------------------------------------------------------------------------
>
> Key: FLINK-21946
> URL: https://issues.apache.org/jira/browse/FLINK-21946
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 1.11.3, 1.12.2
> Reporter: lincoln lee
> Assignee: lincoln lee
> Priority: Minor
> Labels: pull-request-available
> Fix For: 1.13.0
>
>
> CALCITE-4351 introduced a new 'more accurate' formula for estimating the
> number of distinct values, FLINK-19780 fixed one bad case when number of rows
> are large, but still there's exception path when domainSize is in range(0,1),
> the following code in calcite‘s RelMdUtil.numDistinctVals will produce
> Double.NaN result:
> {code}double expo = numSel * Math.log(1.0 - 1.0 / dSize);{code}
> Before CALCITE-4351 was fixed, we should continue the fixing in flink.
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