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https://issues.apache.org/jira/browse/HIVE-14451?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15454101#comment-15454101
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Matt McCline commented on HIVE-14451:
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This should improve performance for TEXT (LazySimple) and non-TEXT
(BinarySortable) [~gopalv] [~ndembla]
Thank you Gopal for the observing this improvement possibility.
> Vectorization: Add byRef mode for borrowed Strings in VectorDeserializeRow
> --------------------------------------------------------------------------
>
> Key: HIVE-14451
> URL: https://issues.apache.org/jira/browse/HIVE-14451
> Project: Hive
> Issue Type: Improvement
> Components: Vectorization
> Reporter: Gopal V
> Assignee: Matt McCline
> Attachments: HIVE-14451.01.patch, HIVE-14451.02.patch
>
>
> In a majority of cases, when using the OptimizedHashMap, the references to
> the byte[] are immutable.
> The hashmap result always allocates on boundary conditions, but never mutates
> a previous buffer.
> Copying Strings out of the hashtable is entirely wasteful and it would be
> easy to know when the currentBytes is a borrowed slice from the original
> input.
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