Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/15857#discussion_r87862736
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/FoldablePropagationSuite.scala
---
@@ -118,14 +118,30 @@ class FoldablePropagationSuite extends PlanTest {
Seq(
testRelation.select(Literal(1).as('x), 'a).select('x + 'a),
testRelation.select(Literal(2).as('x), 'a).select('x + 'a)))
- .select('x)
--- End diff --
```
test("Propagate in subqueries of Union queries") {
val query = Union(
Seq(
testRelation.select(Literal(1).as('x), 'a).select('x, 'x + 'a),
testRelation.select(Literal(2).as('x), 'a).select('x, 'x + 'a)))
.select('x)
val optimized = Optimize.execute(query.analyze)
val correctAnswer = Union(
Seq(
testRelation.select(Literal(1).as('x), 'a)
.select(Literal(1).as('x), (Literal(1).as('x) + 'a).as("(x +
a)")),
testRelation.select(Literal(2).as('x), 'a)
.select(Literal(2).as('x), (Literal(2).as('x) + 'a).as("(x +
a)"))))
.select('x).analyze
comparePlans(optimized, correctAnswer)
}
```
How about this? The `x` (under `Union`) is transformed as the alias of a
literal but the top `x` (above `Union`) is not propagated. This can validate
the white list does not include `Union`.
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