[jira] [Created] (FLINK-21946) FlinkRelMdUtil.numDistinctVals produces exceptional Double.NaN result when domainSize is in range(0,1)

[Shang Yuanchun (Jira)]

lincoln lee created FLINK-21946:
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             Summary: 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: 1.12.2, 1.11.3
            Reporter: lincoln lee
             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 will produce Double.NaN result:
{code}double expo = numSel * Math.log(1.0 - 1.0 / dSize);{code}




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