Github user dbtsai commented on a diff in the pull request:
https://github.com/apache/spark/pull/21952#discussion_r207405634
--- Diff:
external/avro/src/main/scala/org/apache/spark/sql/avro/AvroSerializer.scala ---
@@ -100,13 +100,14 @@ 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]
+ val len = arrayData.numElements()
+ val result = new Array[Any](len)
--- End diff --
I tested this out, and this doesn't help much.
I guess the reason is the avro writer is expecting a boxed `ArrayList`, so
even we call the primitive APIs, Scala will still do the auto-boxing which will
not be much different than the current code.
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