[
https://issues.apache.org/jira/browse/HIVE-5771?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14001395#comment-14001395
]
Remus Rusanu commented on HIVE-5771:
------------------------------------
I have opened a separate issue to track the failure for vectorization_parquet,
HIVE-7082 and I uploaded a patch. I think these changes in HIVE-5771 just
exposed the problem so I though it warrants its own tracking. I've tested the
HIVE-7082.1.patch both on trunk and on HIVE-5771.10.patch and it fixes the
problem.
> 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: HIVE-5771.1.patch, HIVE-5771.10.patch,
> HIVE-5771.2.patch, HIVE-5771.3.patch, HIVE-5771.4.patch, HIVE-5771.5.patch,
> HIVE-5771.6.patch, HIVE-5771.7.patch, HIVE-5771.8.patch, HIVE-5771.9.patch,
> HIVE-5771.patch, HIVE-5771.patch.javaonly
>
>
> 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.
--
This message was sent by Atlassian JIRA
(v6.2#6252)
