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https://issues.apache.org/jira/browse/HIVE-23846?focusedWorklogId=461766&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-461766
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ASF GitHub Bot logged work on HIVE-23846:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 21/Jul/20 22:13
Start Date: 21/Jul/20 22:13
Worklog Time Spent: 10m
Work Description: hsnusonic closed pull request #1266:
URL: https://github.com/apache/hive/pull/1266
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Issue Time Tracking
-------------------
Worklog Id: (was: 461766)
Time Spent: 40m (was: 0.5h)
> Avoid unnecessary serialization and deserialization of bitvectors
> -----------------------------------------------------------------
>
> Key: HIVE-23846
> URL: https://issues.apache.org/jira/browse/HIVE-23846
> Project: Hive
> Issue Type: Bug
> Components: Standalone Metastore
> Reporter: Yu-Wen Lai
> Assignee: Yu-Wen Lai
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.0.0
>
> Time Spent: 40m
> Remaining Estimate: 0h
>
> In the method *getNdvEstimator* of <datatype>*ColumnStatsDataInspector*, it
> will call isSetBitVectors(), in which it serializes the bitvectors again when
> we already have deserialized bitvectors _ndvEstimator_. For example, we can
> see this pattern from
> [LongColumnStatsDataInspector|[https://github.com/apache/hive/blob/master/standalone-metastore/metastore-server/src/main/java/org/apache/hadoop/hive/metastore/columnstats/cache/LongColumnStatsDataInspector.java#L106]].
> This method could check if the _ndvEstimator_ is set first so that it won't
> need to serialize and deserialize back.
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