[GitHub] [spark] BryanCutler commented on a change in pull request #24095: [SPARK-27163][PYTHON] Cleanup and consolidate Pandas UDF functionality

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BryanCutler commented on a change in pull request #24095: [SPARK-27163][PYTHON] Cleanup and consolidate Pandas UDF functionality
URL: https://github.com/apache/spark/pull/24095#discussion_r265678485
 
 

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 File path: sql/core/src/main/scala/org/apache/spark/sql/execution/python/FlatMapGroupsInPandasExec.scala
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 @@ -145,7 +146,15 @@ case class FlatMapGroupsInPandasExec(
         sessionLocalTimeZone,
         pythonRunnerConf).compute(grouped, context.partitionId(), context)
 
-      columnarBatchIter.flatMap(_.rowIterator.asScala).map(UnsafeProjection.create(output, output))
+      columnarBatchIter.flatMap { batch =>
+        // Grouped Map UDF returns a StructType column in ColumnarBatch, select the children here
+        // TODO: ColumnVector getChild is protected, so use ArrowColumnVector which is public
+        val structVector = batch.column(0).asInstanceOf[ArrowColumnVector]
+        val outputVectors = output.indices.map(structVector.getChild(_).asInstanceOf[ColumnVector])
 
 Review comment:
   There might be a better way to do this, or at least make `getChild` public in `ColumnVector` to avoid the casting here. wdyt @ueshin ?

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