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https://issues.apache.org/jira/browse/HIVE-23298?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17098541#comment-17098541
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Jesus Camacho Rodriguez commented on HIVE-23298:
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Thanks [~ashutoshc]. Changes LGTM, +1 (pending tests)
Do you have any theory for the number of rows / data size changing (most of the
times to the half)? It should not be related to this patch per se but probably
worth exploring at some point... Maybe it is a side effect of running
annotation of stats before vs after dedup, i.e., two RS after each other is
accounting for double reduction?
> Disable RS deduplication step in Optimizer if it is run in TezCompiler
> ----------------------------------------------------------------------
>
> Key: HIVE-23298
> URL: https://issues.apache.org/jira/browse/HIVE-23298
> Project: Hive
> Issue Type: Improvement
> Components: Physical Optimizer
> Reporter: Jesus Camacho Rodriguez
> Assignee: Jesus Camacho Rodriguez
> Priority: Major
> Attachments: HIVE-23298.1.patch, HIVE-23298.2.patch, HIVE-23298.patch
>
>
> HIVE-20703 introduced an additional RS deduplication step in TezCompiler. We
> could possibly try to disable the one that runs in {{Optimizer}} if we are
> using Tez so we do not run the optimization twice.
> This issue is to explore that possibility.
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