Github user gengliangwang commented on a diff in the pull request:
https://github.com/apache/spark/pull/19451#discussion_r144136954
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/ReplaceOperatorSuite.scala
---
@@ -50,6 +52,25 @@ class ReplaceOperatorSuite extends PlanTest {
comparePlans(optimized, correctAnswer)
}
+ test("replace Except with Filter") {
--- End diff --
consider add a case that left child is not filter
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