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From gengliangwang <>
Subject [GitHub] spark pull request #19362: [SPARK-22141][SQL] Propagate empty relation befor...
Date Wed, 27 Sep 2017 08:05:32 GMT
GitHub user gengliangwang opened a pull request:

    [SPARK-22141][SQL] Propagate empty relation before checking Cartesian products

    ## What changes were proposed in this pull request?
    When inferring constraints from children, Join's condition can be simplified as None.
    For example,
    val testRelation = LocalRelation('
    val x ="x")
    val y = testRelation.where($"a" === 2 && !($"a" === 2)).as("y")
    x.join.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 for above plan.
    Propagate empty relation before checking Cartesian products, and the issue is resolved.
    ## How was this patch tested?
    Unit test

You can merge this pull request into a Git repository by running:

    $ git pull MoveCheckCartesianProducts

Alternatively you can review and apply these changes as the patch at:

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #19362
commit 0f25a074821481e89a256824b40acf78a06841e5
Author: Wang Gengliang <>
Date:   2017-09-27T07:51:08Z

    propagate empty relation before checking Cartesian products



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