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https://issues.apache.org/jira/browse/HIVE-11406?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14661016#comment-14661016
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Gopal V commented on HIVE-11406:
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I see Matt's fix on both branches now.
Git makes it too easy to commit a fix, but not push it.
> Vectorization: StringExpr::compare() == 0 is bad for performance
> ----------------------------------------------------------------
>
> Key: HIVE-11406
> URL: https://issues.apache.org/jira/browse/HIVE-11406
> Project: Hive
> Issue Type: Bug
> Components: Vectorization
> Affects Versions: 1.3.0, 2.0.0
> Reporter: Gopal V
> Assignee: Matt McCline
> Fix For: 1.3.0, 2.0.0
>
> Attachments: HIVE-11406.01.patch
>
>
> {{StringExpr::compare() == 0}} is forced to evaluate the whole memory
> comparison loop for differing lengths of strings, though there is no
> possibility they will ever be equal.
> Add a {{StringExpr::equals}} which can be a smaller and tighter loop.
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