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https://issues.apache.org/jira/browse/HIVE-8149?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14138313#comment-14138313
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Eugene Koifman commented on HIVE-8149:
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also, hive.mapred.supports.subdirectories=true should be set (and ideally
removed from all the tests)
> hive.optimize.reducededuplication should be set to false for IUD ops
> --------------------------------------------------------------------
>
> Key: HIVE-8149
> URL: https://issues.apache.org/jira/browse/HIVE-8149
> Project: Hive
> Issue Type: Bug
> Components: Query Processor
> Affects Versions: 0.14.0
> Reporter: Eugene Koifman
> Assignee: Alan Gates
>
> this optimizer causes both old and new rows to show up in a select after
> update (for tables involving few rows)
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