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https://issues.apache.org/jira/browse/HIVE-14731?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220550#comment-16220550
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Zoltan Haindrich commented on HIVE-14731:
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[~aplusplus] I'm wondering whether exists a case in which mapjoin should be
preferred instead of the new method; [this
condition|https://github.com/apache/hive/commit/cfbe6125725223657dff1e2c9bc3131a5193ae51#diff-b93043a8ae03d03a39e4b0af641ec3edR108]
drives all crossjoins to be xprods.
> Use Tez cartesian product edge in Hive (unpartitioned case only)
> ----------------------------------------------------------------
>
> Key: HIVE-14731
> URL: https://issues.apache.org/jira/browse/HIVE-14731
> Project: Hive
> Issue Type: Bug
> Reporter: Zhiyuan Yang
> Assignee: Zhiyuan Yang
> Attachments: HIVE-14731.1.patch, HIVE-14731.10.patch,
> HIVE-14731.11.patch, HIVE-14731.12.patch, HIVE-14731.13.patch,
> HIVE-14731.14.patch, HIVE-14731.15.patch, HIVE-14731.16.patch,
> HIVE-14731.17.patch, HIVE-14731.18.patch, HIVE-14731.19.patch,
> HIVE-14731.2.patch, HIVE-14731.20.patch, HIVE-14731.21.patch,
> HIVE-14731.22.patch, HIVE-14731.23.patch, HIVE-14731.3.patch,
> HIVE-14731.4.patch, HIVE-14731.5.patch, HIVE-14731.6.patch,
> HIVE-14731.7.patch, HIVE-14731.8.patch, HIVE-14731.9.patch,
> HIVE-14731.addendum.patch
>
>
> Given cartesian product edge is available in Tez now (see TEZ-3230), let's
> integrate it into Hive on Tez. This allows us to have more than one reducer
> in cross product queries.
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