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https://issues.apache.org/jira/browse/HIVE-10131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14394216#comment-14394216
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Matt McCline commented on HIVE-10131:
-------------------------------------
Observed that the join code really just wants to know if the number of values
is: 0, 1, or more_than_1.
Adding new methods hasRows and isSingleRow so those conditions can be tests
without using rowCount.
Replacing list of ByteSegmentRef with a result object that can read the values
one-by-one.
> LLAP: BytesBytesMultiHashMap and mapjoin container should reuse refs
> --------------------------------------------------------------------
>
> Key: HIVE-10131
> URL: https://issues.apache.org/jira/browse/HIVE-10131
> Project: Hive
> Issue Type: Sub-task
> Reporter: Sergey Shelukhin
> Assignee: Matt McCline
>
> Refs are always allocated and cleared. Should be reused.
> Iterator is another option
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