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https://issues.apache.org/jira/browse/HIVE-21413?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16787936#comment-16787936
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Peter Vary commented on HIVE-21413:
-----------------------------------
[~Andreu]: Most probably you are facing HIVE-15680, and his friends (see the
"related to" jiras). AFAIK this is fixed for Hive on Spark and Hive on Tez for
newer versions, but there still can be some problems with Hive on MR when
different filters are pushed down to the TableScan operators. If you turn off
the PPD, I think is ok in Hive on MR too.
> Bad result using UNION using same table
> ---------------------------------------
>
> Key: HIVE-21413
> URL: https://issues.apache.org/jira/browse/HIVE-21413
> Project: Hive
> Issue Type: Bug
> Components: hpl/sql
> Affects Versions: 1.2.1
> Environment: engine = mr
> TBLPROPERTIES(
> 'auto.purge'='true',
> 'orc.compress'='ZLIB',
> 'serialization.null.format'=''
> )
>
> Reporter: Stéphane
> Priority: Minor
>
> Hi,
> I have a table named "sau' with 1000 rows.
> The table structure is :
>
> ||col_name||data_type||comment||
> |id|string| |
> |mnta|int| |
> |mntb|int| |
> {quote}select id, 'A' as info, mntA as mnt from sau
> union
> select id, 'B' as info, mntB as mnt from sau
> {quote}
> ==> return only rows with "info=B"
> {quote}with
> cte_union as (
> select id, 'A' as info, mntA as mnt from sau
> union
> select id, 'B' as info, mntB as mnt from sau
> )
> select
> count(*)
> from
> cte_union
> {quote}
> ==> return 1000 but should be 2000
>
> I don't know if this bug is fixed on new version.
> Using "union all" clause, the result is correct.
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