Balazs Jeszenszky created IMPALA-7497:
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Summary: Consider reintroducing numNulls count in compute stats
Key: IMPALA-7497
URL: https://issues.apache.org/jira/browse/IMPALA-7497
Project: IMPALA
Issue Type: Improvement
Components: Frontend
Reporter: Balazs Jeszenszky
IMPALA-1003 disabled numNulls calculations for performance reasons. A lot has
changed since, it'd be good to reevaluate computing numNulls. The planner still
has some code that uses it for cardinality estimations, so just adding it back
to compute stats can lead to easy wins.
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