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From "Ted Xu (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HIVE-5771) Constant propagation optimizer for Hive
Date Thu, 07 Nov 2013 08:53:17 GMT
Ted Xu created HIVE-5771:
----------------------------

             Summary: Constant propagation optimizer for Hive
                 Key: HIVE-5771
                 URL: https://issues.apache.org/jira/browse/HIVE-5771
             Project: Hive
          Issue Type: Improvement
          Components: Query Processor
            Reporter: Ted Xu
            Assignee: Ted Xu


Currently there is no constant folding/propagation optimizer, all expressions are evaluated
at runtime. 

HIVE-2470 did a great job on evaluating constants on UDF initializing phase, however, it is
still a runtime evaluation and it doesn't propagate constants from a subquery to outside.

It may reduce I/O and accelerate process if we introduce such an optimizer.



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