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https://issues.apache.org/jira/browse/HIVE-1194?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12838132#action_12838132
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Zheng Shao commented on HIVE-1194:
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If it does not inherit any methods, shall we add an AbstractMapJoinOperator as
the common parent?
That AbstractMapJoinOperator can be converted to MapJoinOperator (or
HashBasedMapJoinOperator, to be accurate) or SortMergeJoinOperator depending on
the configuration/table properties.
> sorted merge join
> -----------------
>
> Key: HIVE-1194
> URL: https://issues.apache.org/jira/browse/HIVE-1194
> Project: Hadoop Hive
> Issue Type: New Feature
> Components: Query Processor
> Reporter: Namit Jain
> Assignee: He Yongqiang
> Fix For: 0.6.0
>
>
> If the input tables are sorted on the join key, and a mapjoin is being
> performed, it is useful to exploit the sorted properties of the table.
> This can lead to substantial cpu savings - this needs to work across bucketed
> map joins also.
> Since, sorted properties of a table are not enforced currently, a new
> parameter can be added to specify to use the sort-merge join.
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