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https://issues.apache.org/jira/browse/HIVE-623?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12730632#action_12730632
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Zheng Shao commented on HIVE-623:
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Text.charAt(i) is actually very expensive - it calls ByteBuffer.wrap which
creates a new object.
Can we directly use the UTF-8 encoding map to test whether a byte is a trailing
byte or not (for both reverse and length)
> Optimize length and reverse UDFs
> --------------------------------
>
> Key: HIVE-623
> URL: https://issues.apache.org/jira/browse/HIVE-623
> Project: Hadoop Hive
> Issue Type: Improvement
> Components: Query Processor
> Reporter: Emil Ibrishimov
> Priority: Minor
> Attachments: HIVE-623.1.patch, HIVE-623.2.patch
>
>
> Parse Text instead of converting to String in "length", "reverse" and other
> UDFs.
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