Ruben Q L created HIVE-29627:
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Summary: Improve IS_NULL selectivity
Key: HIVE-29627
URL: https://issues.apache.org/jira/browse/HIVE-29627
Project: Hive
Issue Type: Improvement
Reporter: Ruben Q L
Currently IS_NULL selectivity computation in FilterSelectivityEstimator does
not have any special treatment, and just goes over the default computation.
However, if statistics are available, we could get a much better estimation (as
it already happens with IS_NOT_NULL) by using numberOfNulls / numRows
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