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https://issues.apache.org/jira/browse/HIVE-15987?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Teddy Choi updated HIVE-15987:
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Description: Most of data operations in Hive uses null operations. The
current implementation of ColumnVector.isNull uses a boolean array, which uses
8 bits per 1 boolean. BitSet is a more compact representation, as it uses 1 bit
per 1 boolean with a backing long array. Also logical operations between longs
are much faster than ones with bytes as it uses less instructions per byte. So
it will bring 8x or more performance for null operations.
> Replace ColumnVector.isNull boolean[] impl. with BitSet
> -------------------------------------------------------
>
> Key: HIVE-15987
> URL: https://issues.apache.org/jira/browse/HIVE-15987
> Project: Hive
> Issue Type: Improvement
> Reporter: Teddy Choi
> Assignee: Teddy Choi
>
> Most of data operations in Hive uses null operations. The current
> implementation of ColumnVector.isNull uses a boolean array, which uses 8 bits
> per 1 boolean. BitSet is a more compact representation, as it uses 1 bit per
> 1 boolean with a backing long array. Also logical operations between longs
> are much faster than ones with bytes as it uses less instructions per byte.
> So it will bring 8x or more performance for null operations.
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