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https://issues.apache.org/jira/browse/HIVE-2470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13116717#comment-13116717
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Jonathan Chang commented on HIVE-2470:
--------------------------------------
The goal here was to maximize compatibility; that is, things can be constant
folded only if they explicitly ask to be. The other reason was that some UDFs
may have special handling for constants (e.g. all the reflection-based stuff).
> Improve support for Constant Object Inspectors
> ----------------------------------------------
>
> Key: HIVE-2470
> URL: https://issues.apache.org/jira/browse/HIVE-2470
> Project: Hive
> Issue Type: Improvement
> Reporter: Jonathan Chang
> Assignee: Jonathan Chang
> Attachments: HIVE-1360.part2.patch, HIVE-2470.patch
>
>
> ConstantObjectInspectors are nice but they need to be more widely supported
> and used. In particular,
> * More functions need to be using them.
> * There need to be facilities for propagating constness.
> * Support for complex types must be added.
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