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https://issues.apache.org/jira/browse/HIVE-13737?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15302342#comment-15302342
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Ashutosh Chauhan commented on HIVE-13737:
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yes. There are lots of improvements to address this issue: HIVE-13334
> incorrect count when multiple inserts with union all
> ----------------------------------------------------
>
> Key: HIVE-13737
> URL: https://issues.apache.org/jira/browse/HIVE-13737
> Project: Hive
> Issue Type: Bug
> Components: Hive
> Affects Versions: 1.2.1
> Environment: hdp 2.3.4.7 on Red Hat 6
> Reporter: Frank Luo
> Priority: Critical
>
> Here is a test case to illustrate the issue. It seems MR works fine but Tez
> is having the problem.
> CREATE TABLE test(col1 STRING);
> CREATE TABLE src (col1 string);
> insert into table src values ('a');
> INSERT into TABLE test
> select * from (
> SELECT * from src
> UNION ALL
> SELECT * from src) x;
> -- do it one more time
> INSERT INTO TABLE test
> SELECT * from src
> UNION ALL
> SELECT * from src;
> --below gives correct result
> SELECT * FROM TEST;
> --count is incorrect. It might give either '1' or '2', but I am expecting '4'
> SELECT count (*) FROM test;
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