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Posted to issues@spark.apache.org by "zenglinxi (JIRA)" <ji...@apache.org> on 2018/06/20 13:15:00 UTC

[jira] [Created] (SPARK-24607) Distribute by rand() can lead to data inconsistency

zenglinxi created SPARK-24607:
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             Summary: Distribute by rand() can lead to data inconsistency
                 Key: SPARK-24607
                 URL: https://issues.apache.org/jira/browse/SPARK-24607
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.3.1, 2.2.0
            Reporter: zenglinxi


Noticed the following queries can give different results:
{code:java}
select count(*) from tbl;
select count(*) from (select * from tbl distribute by rand()) a;{code}
this issue was first reported by someone using kylin for building cube with hiveSQL which include  distribute by rand, I think it's also an hidden serious problem in sparksql.



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