Shant Hovsepian created IMPALA-10185:
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Summary: Leverage boolean statistics for computing selectivity
Key: IMPALA-10185
URL: https://issues.apache.org/jira/browse/IMPALA-10185
Project: IMPALA
Issue Type: Improvement
Affects Versions: Impala 3.4.0
Reporter: Shant Hovsepian
Assignee: Shant Hovsepian
As part of computing stats for a boolean column we record the value counts.
numTrues, numFalses, numNulls.
However when calculating cardinality for boolean column predicates the
selectivity of 1/3 is always used instead of factoring the value distribution
recorded in the stats.
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