Github user wesm commented on a diff in the pull request:
https://github.com/apache/spark/pull/15821#discussion_r98078944
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2355,6 +2359,28 @@ class Dataset[T] private[sql](
}
/**
+ * Collect a Dataset to an ArrowRecordBatch.
+ *
+ * @group action
+ * @since 2.2.0
+ */
+ @DeveloperApi
+ def collectAsArrow(
+ allocator: RootAllocator = new RootAllocator(Long.MaxValue)):
ArrowRecordBatch = {
--- End diff --
When we are able to adopt a streaming model, it might be useful for the
Arrow payload data structure to be iterator based, so we can begin serving
record batches to Python as soon as they begin arriving from the task executors
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