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https://issues.apache.org/jira/browse/HIVE-17695?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16197887#comment-16197887
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Sergey Shelukhin commented on HIVE-17695:
-----------------------------------------
Cannot be done with list bucketing in the picture (it's
delta_.../lb-stuff/union-suffix iirc).
> HiveInputFormat.processForWriteIds(Path dir, JobConf conf, ValidTxnList
> validTxnList, List<Path> finalPaths)
> ------------------------------------------------------------------------------------------------------------------
>
> Key: HIVE-17695
> URL: https://issues.apache.org/jira/browse/HIVE-17695
> Project: Hive
> Issue Type: Sub-task
> Components: Transactions
> Reporter: Eugene Koifman
>
> this has special handling for writes resulting from Union All query
> In full Acid case at least, these subdirs get collapsed in favor of
> statementId based dir names (delta_x_y_stmtId). It would be cleaner/simpler
> to make MM follow the same logic. (full acid does it Hive.moveFiles() I
> think)
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