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https://issues.apache.org/jira/browse/HIVE-23140?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17076783#comment-17076783
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Rajesh Balamohan commented on HIVE-23140:
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"Insert overwrite/into" follows
https://github.com/apache/hive/blob/master/ql/src/java/org/apache/hadoop/hive/ql/exec/Utilities.java#L1506.
Yes tried out the "CTAS and insert into/overwrite" cases and it works fine;
When the same file name is present, it creates "000000_0_copy_1" correctly.
> Optimise file move in CTAS
> ---------------------------
>
> Key: HIVE-23140
> URL: https://issues.apache.org/jira/browse/HIVE-23140
> Project: Hive
> Issue Type: Improvement
> Components: HiveServer2
> Reporter: Rajesh Balamohan
> Assignee: Rajesh Balamohan
> Priority: Minor
> Attachments: HIVE-23140.1.patch
>
>
> FileSinkOperator can be optimized to run file move operation (/_tmp.-ext -->
> /-ext-) in parallel fashion. Currently it invokes
> {{Utilities.moveSpecifiedFileStatus}} and renames in sequential mode causing
> delays in cloud storage. FS rename can be used (S3A internally has parallel
> rename operation).
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