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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