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https://issues.apache.org/jira/browse/HIVE-3467?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13468946#comment-13468946
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Zhenxiao Luo commented on HIVE-3467:
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Comments addressed. Review request resubmitted at:
https://reviews.facebook.net/D5769
> BucketMapJoinOptimizer should optimize joins on partition columns
> -----------------------------------------------------------------
>
> Key: HIVE-3467
> URL: https://issues.apache.org/jira/browse/HIVE-3467
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.10.0
> Reporter: Kevin Wilfong
> Assignee: Zhenxiao Luo
> Attachments: HIVE-3467.1.patch.txt, HIVE-3467.2.patch.txt
>
>
> Consider the query:
> SELECT * FROM t1 JOIN t2 on t1.part = t2.part and t1.key = t2.key;
> Where t1 and t2 are partitioned by part and bucketed by key.
> Suppose part take values 1 and 2 and t1 and t2 are bucketed into 2 buckets.
> The bucket map join optimizer will put the first bucket of part=1 and part=2
> partitions of t2 into the same mapper as that of part=1 partition of t1. It
> will do the same for the part=2 partition of t1.
> It could take advantage of the partition values and send the first bucket of
> only the part=1 partitions of t1 and t2 into one mapper and the first bucket
> of only the part=2 partitions into another.
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