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From "Zheng Shao (JIRA)" <j...@apache.org>
Subject [jira] Created: (HIVE-364) Hive Operators should calculate the value of common expressions just once
Date Tue, 24 Mar 2009 20:57:50 GMT
Hive Operators should calculate the value of common expressions just once
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                 Key: HIVE-364
                 URL: https://issues.apache.org/jira/browse/HIVE-364
             Project: Hadoop Hive
          Issue Type: Improvement
          Components: Serializers/Deserializers
            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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