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https://issues.apache.org/jira/browse/HIVE-1638?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12916256#action_12916256
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Ning Zhang commented on HIVE-1638:
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Siying, great work!
Also can you do an optimization for the case when the parameters are constants
(e.g., the 2nd parameter of f_c='5015'). The objectInspector doesn't have the
information of whether the input parameter is constant or not, but I think if
you check in evaluate() whether the parameter is the same *object* between the
1st and 2nd row, you can conclude the parameter is a constant. This can save a
lot in object constructions.
> convert commonly used udfs to generic udfs
> ------------------------------------------
>
> Key: HIVE-1638
> URL: https://issues.apache.org/jira/browse/HIVE-1638
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: Siying Dong
> Attachments: HIVE-1638.1.patch
>
>
> Copying a mail from Joy:
> i did a little bit of profiling of a simple hive group by query today. i was
> surprised to see that one of the most expensive functions were in converting
> the equals udf (i had some simple string filters) to generic udfs.
> (primitiveobjectinspectorconverter.textconverter)
> am i correct in thinking that the fix is to simply port some of the most
> popular udfs (string equality/comparison etc.) to generic udsf?
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