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https://issues.apache.org/jira/browse/HIVE-26018?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Denys Kuzmenko resolved HIVE-26018.
-----------------------------------
Fix Version/s: 4.1.0
Resolution: Fixed
> The result of UNIQUEJOIN on Hive on Tez is inconsistent with that of MR
> -----------------------------------------------------------------------
>
> Key: HIVE-26018
> URL: https://issues.apache.org/jira/browse/HIVE-26018
> Project: Hive
> Issue Type: Bug
> Components: Tez
> Affects Versions: 3.1.0, 4.0.0
> Reporter: GuangMing Lu
> Assignee: Seonggon Namgung
> Priority: Major
> Labels: pull-request-available
> Fix For: 4.1.0
>
>
> The result of UNIQUEJOIN on Hive on Tez is inconsistent with that of MR, and
> the result Is not correct, for example:
> CREATE TABLE T1_n1x(key STRING, val STRING) STORED AS orc;
> CREATE TABLE T2_n1x(key STRING, val STRING) STORED AS orc;
> insert into T1_n1x values('aaa', '111'),('bbb', '222'),('ccc', '333');
> insert into T2_n1x values('aaa', '111'),('ddd', '444'),('ccc', '333');
> SELECT a.key, b.key FROM UNIQUEJOIN PRESERVE T1_n1x a (a.key), PRESERVE
> T2_n1x b (b.key);
> Hive on Tez result: wrong
> |a.key |b.key |
> |aaa |aaa |
> |bbb |NULL |
> |ccc |ccc |
> |NULL |ddd |
> +------------------+
> Hive on MR result: right
> |a.key |b.key |
> |aaa |aaa |
> |bbb |NULL |
> |ccc |ccc |
> +-----------------+
> SELECT a.key, b.key FROM UNIQUEJOIN T1_n1x a (a.key), T2_n1x b (b.key);
> Hive on Tez result: wrong
> +-------------------+
> |a.key |b.key |
> |aaa |aaa |
> |bbb |NULL |
> |ccc |ccc |
> |NULL |ddd |
> +-----------------+
> Hive on MR result: right
> |a.key |b.key |
> |aaa |aaa |
> |ccc |ccc |
>
>
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