Caizhi Weng created FLINK-19780:
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Summary: 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
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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