Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/23138#discussion_r236334056
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/SetOperationSuite.scala
---
@@ -196,4 +196,31 @@ class SetOperationSuite extends PlanTest {
))
comparePlans(expectedPlan, rewrittenPlan)
}
+
+ test("SPARK-23356 union: expressions with number in project list are
pushed down") {
--- End diff --
`expressions with number` -> `expressions with literal`
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