HIVE-29627 IS_NULL selectivity improvement with stats#6553
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cyanzheng2926 wants to merge 2 commits into
Open
HIVE-29627 IS_NULL selectivity improvement with stats#6553cyanzheng2926 wants to merge 2 commits into
cyanzheng2926 wants to merge 2 commits into
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What changes were proposed in this pull request?
This PR is for issues.apache.org/jira/browse/HIVE-29627 which tries to improve the IS_NULL selectivity with exisiting statistics.
Why are the changes needed?
To improve the selectivity of IS_NULL with stats instead of falling to the default path in the switch statement.
Does this PR introduce any user-facing change?
No.
How was this patch tested?
Added unit tests under TestFilterSelectivityEstimator.java