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https://issues.apache.org/jira/browse/HIVE-364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Carl Steinbach updated HIVE-364:
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Component/s: (was: Serializers/Deserializers)
Query Processor
> Hive Operators should calculate the value of common expressions just once
> -------------------------------------------------------------------------
>
> Key: HIVE-364
> URL: https://issues.apache.org/jira/browse/HIVE-364
> Project: Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Zheng Shao
>
> Currently, if we have "t.a + t.b" in 2 different expressions in the select
> clause / where clause, we are computing it twice.
> We should cache the value of the expression evaluation result to save CPU
> time.
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