Github user dbtsai commented on a diff in the pull request: https://github.com/apache/spark/pull/21952#discussion_r207444037 --- Diff: external/avro/src/main/scala/org/apache/spark/sql/avro/AvroSerializer.scala --- @@ -100,17 +100,20 @@ class AvroSerializer(rootCatalystType: DataType, rootAvroType: Schema, nullable: et, resolveNullableType(avroType.getElementType, containsNull)) (getter, ordinal) => { val arrayData = getter.getArray(ordinal) - val result = new java.util.ArrayList[Any] --- End diff -- My previous experience in ml project told me that `ArrayList` has slower setter performance due to one extra function call, so my preference is using array as much as possible, and wrap it into the right container in the end.
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