[GitHub] [spark] cfmcgrady commented on a change in pull request #23900: [SPARK-23836][PYTHON] Add support for StructType return in Scalar Pandas UDF

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

cfmcgrady commented on a change in pull request #23900:
URL: https://github.com/apache/spark/pull/23900#discussion_r426568363



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File path: python/pyspark/sql/types.py
##########
@@ -1616,6 +1616,12 @@ def to_arrow_type(dt):
         if type(dt.elementType) == TimestampType:
             raise TypeError("Unsupported type in conversion to Arrow: " + str(dt))
         arrow_type = pa.list_(to_arrow_type(dt.elementType))
+    elif type(dt) == StructType:
+        if any(type(field.dataType) == StructType for field in dt):
+            raise TypeError("Nested StructType not supported in conversion to Arrow")

Review comment:
       I am curious why `ArrayType(elementType = StructType)` support  was removed from here? @BryanCutler 




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