Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/18787#discussion_r135438683
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/arrow/ArrowConverters.scala
---
@@ -111,6 +125,66 @@ private[sql] object ArrowConverters {
}
/**
+ * Maps Iterator from ArrowPayload to InternalRow. Returns a pair
containing the row iterator
+ * and the schema from the first batch of Arrow data read.
+ */
+ private[sql] def fromPayloadIterator(
+ payloadIter: Iterator[ArrowPayload],
+ context: TaskContext): ArrowRowIterator = {
+ val allocator =
+ ArrowUtils.rootAllocator.newChildAllocator("fromPayloadIterator", 0,
Long.MaxValue)
+
+ new ArrowRowIterator {
+ private var reader: ArrowFileReader = null
+ private var schemaRead = StructType(Seq.empty)
+ private var rowIter = if (payloadIter.hasNext) nextBatch() else
Iterator.empty
--- End diff --
We can simply put `Iterator.empty` here.
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