[GitHub] [spark] HyukjinKwon commented on a diff in pull request #37864: [SPARK-40414][SQL][PYSPARK] More generic type on PythonArrowInput and PythonArrowOutput

[GitBox <gi...@apache.org>]

HyukjinKwon commented on code in PR #37864:
URL: https://github.com/apache/spark/pull/37864#discussion_r969649861


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sql/core/src/main/scala/org/apache/spark/sql/execution/python/PythonArrowOutput.scala:
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@@ -33,12 +33,14 @@ import org.apache.spark.sql.vectorized.{ArrowColumnVector, ColumnarBatch, Column
 
 /**
  * A trait that can be mixed-in with [[BasePythonRunner]]. It implements the logic from
- * Python (Arrow) to JVM (ColumnarBatch).
+ * Python (Arrow) to JVM (output type being deserialized from ColumnarBatch).
  */
-private[python] trait PythonArrowOutput { self: BasePythonRunner[_, ColumnarBatch] =>
+private[python] trait PythonArrowOutput[OUT <: AnyRef] { self: BasePythonRunner[_, OUT] =>

Review Comment:
   qq: should it be `<: AnyRef`?



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