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Posted to dev@hive.apache.org by "Xuefu Zhang (JIRA)" <ji...@apache.org> on 2013/11/14 18:41:21 UTC
[jira] [Commented] (HIVE-5771) Constant propagation optimizer for
Hive
[ https://issues.apache.org/jira/browse/HIVE-5771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13822655#comment-13822655 ]
Xuefu Zhang commented on HIVE-5771:
-----------------------------------
[~tedxu] Thank you for your patch. Please rename the patch according to the convention so that test can run, something like HIVE-5771.patch, HIVE-5771.1.patch, and so on.
> 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
> Attachments: constprog_default_true.patch
>
>
> 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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