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https://issues.apache.org/jira/browse/HIVE-18875?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16493010#comment-16493010
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Gunther Hagleitner commented on HIVE-18875:
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Thinking some more about the op traits. I think having "a, b" as bucketing
cols, means that for every combination of a & b you get all the rows of that in
the same processor. So if a select operator does not project all of them, the
new bucketing cols should be empty, not a subset (with adjusted bucket number).
The prefix logic seems correct for sort cols (sorted by "a, b" is also sorted
by "a").
> Enable SMB Join by default in Tez
> ---------------------------------
>
> Key: HIVE-18875
> URL: https://issues.apache.org/jira/browse/HIVE-18875
> Project: Hive
> Issue Type: Task
> Reporter: Deepak Jaiswal
> Assignee: Deepak Jaiswal
> Priority: Major
> Attachments: HIVE-18875.1.patch, HIVE-18875.10.patch,
> HIVE-18875.2.patch, HIVE-18875.3.patch, HIVE-18875.4.patch,
> HIVE-18875.5.patch, HIVE-18875.6.patch, HIVE-18875.7.patch,
> HIVE-18875.8.patch, HIVE-18875.9.patch
>
>
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