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https://issues.apache.org/jira/browse/HIVE-7767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brock Noland updated HIVE-7767:
-------------------------------
Issue Type: Sub-task (was: Bug)
Parent: HIVE-7292
> 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
>
> Turing on the hive.optimize.union.remove property generates wrong union all
> result.
> For Example:
> 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;
> when the hive.optimize.union.remove is turned on, the query result is like:
> 1 1
> 2 1
> 3 1
> 7 1
> 8 2
> when the hive.optimize.union.remove is turned off, the query result is like:
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> The expected query result is:
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
> 7 1
> 2 1
> 8 2
> 3 1
> 1 1
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