Github user zsxwing commented on a diff in the pull request: https://github.com/apache/spark/pull/19687#discussion_r149765467 --- Diff: sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/encoders/ExpressionEncoderSuite.scala --- @@ -370,7 +372,7 @@ class ExpressionEncoderSuite extends PlanTest with AnalysisTest { private def encodeDecodeTest[T : ExpressionEncoder]( input: T, testName: String): Unit = { - test(s"encode/decode for $testName: $input") { + testAndVerifyNotLeakingReflectionObjects(s"encode/decode for $testName: $input") { val encoder = implicitly[ExpressionEncoder[T]] --- End diff -- This is to verify that `UnresolvedMapObjects` doesn't leak. ScalaReflection creates a function here but the function runs after creating the encoder: https://github.com/apache/spark/blob/6327ea570bf542983081c5d1d3ee7e6123365c8f/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/ScalaReflection.scala#L280
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