Github user hvanhovell commented on the issue:
https://github.com/apache/spark/pull/16044
You can just write an optimizer test case. You can for example add this to
the `FilterPushdownSuite`:
```scala
test("joins: only push down join conditions to the right of an existence
join") {
val x = testRelation.subquery('x)
val y = testRelation.subquery('y)
val filerVal = 'val.boolean
val originalQuery =
x.join(y,
ExistenceJoin(filerVal),
Some("x.b".attr === "y.b".attr && "y.a".attr > 10 && "x.a".attr >
10)).analyze
val optimized = Optimize.execute(originalQuery)
val correctAnswer =
x.join(
y.where("y.a".attr > 10),
ExistenceJoin(filerVal),
Some("x.b".attr === "y.b".attr && "x.a".attr > 10))
.analyze
comparePlans(optimized,
analysis.EliminateSubqueryAliases(correctAnswer))
}
```
This probably passes.
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