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From "Ke Jia (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-17139) Conditional expressions optimization: skip the expression evaluation if the condition is not satisfied for vectorization engine.
Date Fri, 21 Jul 2017 04:39:00 GMT
Ke Jia created HIVE-17139:
-----------------------------

             Summary: Conditional expressions optimization: skip the expression evaluation
if the condition is not satisfied for vectorization engine.
                 Key: HIVE-17139
                 URL: https://issues.apache.org/jira/browse/HIVE-17139
             Project: Hive
          Issue Type: Improvement
            Reporter: Ke Jia
            Assignee: Ke Jia


The case when and if statement execution for Hive vectorization is not optimal, which all
the conditional and else expressions are evaluated for current implementation. The optimized
approach is to update the selected array of batch parameter after the conditional expression
is executed. Then the else expression will only do the selected rows instead of all.



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