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https://issues.apache.org/jira/browse/HIVE-8349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14167476#comment-14167476
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Gopal V commented on HIVE-8349:
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Auto-reducer parallelism is not the issue - the issue has to do with the fact
that the keyCols != partCols.
> DISTRIBUTE BY should work with tez auto-parallelism enabled
> -----------------------------------------------------------
>
> Key: HIVE-8349
> URL: https://issues.apache.org/jira/browse/HIVE-8349
> Project: Hive
> Issue Type: Bug
> Components: Physical Optimizer
> Affects Versions: 0.14.0
> Reporter: Gopal V
> Assignee: Gopal V
>
> Current implementation of DISTRIBUTE BY does not work when tez
> auto-parallelism is turned on, because of hashCode distribution issues.
> In case of distribute by, the key is actually zero bytes, with only
> partitioning enabled via hashCode - this adversely affects the uniform
> hashing implementation.
> In an ideal scenario, the edge should go from the ordered kv input to the
> unordered partitioned edge, to speed up the processing massively.
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