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Posted to dev@hive.apache.org by "Carl Steinbach (JIRA)" <ji...@apache.org> on 2011/04/06 01:22:06 UTC

[jira] [Updated] (HIVE-364) Hive Operators should calculate the value of common expressions just once

     [ https://issues.apache.org/jira/browse/HIVE-364?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Carl Steinbach updated HIVE-364:
--------------------------------

    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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