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[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('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 #19362 from gengliangwang/MoveCheckCartesianProducts.
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