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https://issues.apache.org/jira/browse/HIVE-11297?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16049923#comment-16049923
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Chao Sun commented on HIVE-11297:
---------------------------------
Sure. Added comments in RB. Regarding the output file, you can just use
{{-Dtest.output.overwrite=true}} to generate new file.
> Combine op trees for partition info generating tasks [Spark branch]
> -------------------------------------------------------------------
>
> Key: HIVE-11297
> URL: https://issues.apache.org/jira/browse/HIVE-11297
> Project: Hive
> Issue Type: Bug
> Affects Versions: spark-branch
> Reporter: Chao Sun
> Assignee: liyunzhang_intel
> Attachments: HIVE-11297.1.patch, HIVE-11297.2.patch,
> HIVE-11297.3.patch
>
>
> Currently, for dynamic partition pruning in Spark, if a small table generates
> partition info for more than one partition columns, multiple operator trees
> are created, which all start from the same table scan op, but have different
> spark partition pruning sinks.
> As an optimization, we can combine these op trees and so don't have to do
> table scan multiple times.
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