Zoltan Haindrich created HIVE-25732:
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Summary: Improve HLL insert performance
Key: HIVE-25732
URL: https://issues.apache.org/jira/browse/HIVE-25732
Project: Hive
Issue Type: Improvement
Reporter: Zoltan Haindrich
HIVE-23095 have fixed a correctness issue and removed a temporary list which
supposed to speed up the algorithm and thus it suffered some performance
degradation.
There are ways to put back some of that stuff; or consider other options to
gain back the lost performance - now that the bug is fixed it should be a
performance only improvement ticket.
It would be interesting to know how much time we spend on updating this DS
during a large insert to know the weight of such an improvement.
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