Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19797#discussion_r153973737
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/optimizer/complexTypesSuite.scala
---
@@ -164,6 +165,12 @@ class ComplexTypesSuite extends PlanTest{
comparePlans(Optimizer execute query, expected)
}
+ test("SPARK-22570: should not create a lot of instance variables") {
--- End diff --
nit: `Cast should not create a lot of global variables`
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