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https://issues.apache.org/jira/browse/HIVE-23846?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yu-Wen Lai reassigned HIVE-23846:
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> 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
>
> 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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