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https://issues.apache.org/jira/browse/HIVE-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14104234#comment-14104234
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Brock Noland commented on HIVE-7767:
------------------------------------
Kicked off pre-commits on this one again.
> hive.optimize.union.remove does not work properly [Spark Branch]
> ----------------------------------------------------------------
>
> Key: HIVE-7767
> URL: https://issues.apache.org/jira/browse/HIVE-7767
> Project: Hive
> Issue Type: Sub-task
> Reporter: Na Yang
> Assignee: Na Yang
> Attachments: HIVE-7767.1-spark.patch, HIVE-7767.2-spark.patch
>
>
> Turing on the hive.optimize.union.remove property generates wrong union all
> result.
> For Example:
> {noformat}
> create table inputTbl1(key string, val string) stored as textfile;
> load data local inpath '../../data/files/T1.txt' into table inputTbl1;
> SELECT *
> FROM (
> SELECT key, count(1) as values from inputTbl1 group by key
> UNION ALL
> SELECT key, count(1) as values from inputTbl1 group by key
> ) a;
> {noformat}
> when the hive.optimize.union.remove is turned on, the query result is like:
> {noformat}
> 1 1
> 2 1
> 3 1
> 7 1
> 8 2
> {noformat}
> when the hive.optimize.union.remove is turned off, the query result is like:
> {noformat}
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> {noformat}
> The expected query result is:
> {noformat}
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> {noformat}
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