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https://issues.apache.org/jira/browse/SPARK-16343?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cheng Lian updated SPARK-16343:
-------------------------------
Assignee: Jiang Xingbo
> Improve the PushDownPredicate rule to pushdown predicates currectly in
> non-deterministic condition
> --------------------------------------------------------------------------------------------------
>
> Key: SPARK-16343
> URL: https://issues.apache.org/jira/browse/SPARK-16343
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.6.2, 2.0.0
> Reporter: Jiang Xingbo
> Assignee: Jiang Xingbo
> Priority: Critical
> Fix For: 2.1.0
>
>
> Currently our Optimizer may reorder the predicates to run them more
> efficient, but in non-deterministic condition, change the order between
> deterministic parts and non-deterministic parts may change the number of
> input rows. For example:
> {code:sql}
> SELECT a FROM t WHERE rand() < 0.1 AND a = 1
> {code}
> And
> {code:sql}
> SELECT a FROM t WHERE a = 1 AND rand() < 0.1
> {code}
> may call rand() for different times and therefore the output rows differ.
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