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https://issues.apache.org/jira/browse/SPARK-24607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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zenglinxi updated SPARK-24607:
------------------------------
Description:
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, may happen during failure tolerance
operations, I think it's also an hidden serious problem in sparksql.
was:
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.
> 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: 2.2.0, 2.3.1
> Reporter: zenglinxi
> Priority: Major
>
> 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, may happen during failure
> tolerance operations, I think it's also an hidden serious problem in sparksql.
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