HyukjinKwon commented on a change in pull request #29283:
URL: https://github.com/apache/spark/pull/29283#discussion_r462136305
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File path: sql/core/src/main/scala/org/apache/spark/sql/execution/objects.scala
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@@ -567,7 +567,14 @@ case class FlatMapGroupsInRWithArrowExec(
// binary in a batch due to the limitation of R API. See also ARROW-4512.
val columnarBatchIter = runner.compute(groupedByRKey, -1)
val outputProject = UnsafeProjection.create(output, output)
- columnarBatchIter.flatMap(_.rowIterator().asScala).map(outputProject)
+ val outputTypes = StructType.fromAttributes(output).map(_.dataType)
+
+ columnarBatchIter.flatMap { batch =>
+ val actualDataTypes = (0 until batch.numCols()).map(i =>
batch.column(i).dataType())
+ assert(outputTypes == actualDataTypes, "Invalid schema from gapply():
" +
+ s"expected ${outputTypes.mkString(", ")}, got
${actualDataTypes.mkString(", ")}")
+ batch.rowIterator().asScala
Review comment:
This is same as `dapply`:
https://github.com/apache/spark/blob/17586f9ed25cbb1dd7dbb221aecb8749623e2175/sql/core/src/main/scala/org/apache/spark/sql/execution/objects.scala#L247-L251
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