[Backport][SPARK-22141][SQL] Propagate empty relation before checking Cartesian products #19366
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… products
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.where($"x.a" === $"y.a")
```
The plan will become
```
Join Inner
:- LocalRelation <empty>, [a#23]
+- LocalRelation <empty>, [a#224]
```
And the Cartesian products check will throw exception for above plan.
Propagate empty relation before checking Cartesian products, and the issue is resolved.
Unit test
Author: Wang Gengliang <ltnwgl@gmail.com>
Closes apache#19362 from gengliangwang/MoveCheckCartesianProducts.
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Test build #82239 has finished for PR 19366 at commit
|
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Merging to 2.2. Thanks! |
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Can you close? |
asfgit
pushed a commit
that referenced
this pull request
Sep 27, 2017
… Cartesian products Back port #19362 to branch-2.2 ## What changes were proposed in this pull request? When inferring constraints from children, Join's condition can be simplified as None. For example, ``` val testRelation = LocalRelation('a.int) val x = testRelation.as("x") val y = testRelation.where($"a" === 2 && !($"a" === 2)).as("y") x.join.where($"x.a" === $"y.a") ``` The plan will become ``` Join Inner :- LocalRelation <empty>, [a#23] +- LocalRelation <empty>, [a#224] ``` And the Cartesian products check will throw exception for above plan. Propagate empty relation before checking Cartesian products, and the issue is resolved. ## How was this patch tested? Unit test Author: Wang Gengliang <ltnwgl@gmail.com> Closes #19366 from gengliangwang/branch-2.2.
MatthewRBruce
pushed a commit
to Shopify/spark
that referenced
this pull request
Jul 31, 2018
… Cartesian products Back port apache#19362 to branch-2.2 ## What changes were proposed in this pull request? When inferring constraints from children, Join's condition can be simplified as None. For example, ``` val testRelation = LocalRelation('a.int) val x = testRelation.as("x") val y = testRelation.where($"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 Author: Wang Gengliang <ltnwgl@gmail.com> Closes apache#19366 from gengliangwang/branch-2.2.
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Back port #19362 to branch-2.2
What changes were proposed in this pull request?
When inferring constraints from children, Join's condition can be simplified as None.
For example,
The plan will become
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