Yu-Wen Lai created HIVE-23846: --------------------------------- Summary: 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
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. -- This message was sent by Atlassian Jira (v8.3.4#803005)