[jira] [Assigned] (SPARK-22141) Propagate empty relation before checking Cartesian products

["Apache Spark (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SPARK-22141?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Apache Spark reassigned SPARK-22141:
------------------------------------

    Assignee:     (was: Apache Spark)

> Propagate empty relation before checking Cartesian products
> -----------------------------------------------------------
>
>                 Key: SPARK-22141
>                 URL: https://issues.apache.org/jira/browse/SPARK-22141
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 2.2.0
>            Reporter: Gengliang Wang
>            Priority: Critical
>
> When inferring constraints from children, Join's condition can be simplified as None.
> For example,
>     val testRelation = LocalRelation('a.int)
>     val x = testRelation.as("x")
>     val y = testRelation.where($"a" === 2 && !($"a" === 2)).as("y")
>     x.join(y).where($"x.a" === $"y.a")
> The plan will become
> Join Inner
> :- LocalRelation <empty>, [a#23]
> +- LocalRelation <empty>, [a#224]
> And the Cartesian products check will throw exception.
> Propagate empty relation before checking Cartesian products, and the issue is resolved.



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