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https://issues.apache.org/jira/browse/HIVE-18126?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16261971#comment-16261971
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Sergey Shelukhin commented on HIVE-18126:
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Also what about insert overwrite with union in tez?
> Mechanics of multiple commands with OVERWRITE in a singe transactions
> ---------------------------------------------------------------------
>
> Key: HIVE-18126
> URL: https://issues.apache.org/jira/browse/HIVE-18126
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Reporter: Eugene Koifman
> Assignee: Eugene Koifman
>
> for Insert overwrite/load data overwrite we create base_x/ to hold the data
> thus are able to make Overwrite command non-blocking.
> What happens if multiple IOWs are run against the same table/partition in the
> same transaction.
> should base support a suffix base_x_000 like deltas?
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