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https://issues.apache.org/jira/browse/SPARK-34600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17304569#comment-17304569
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Hyukjin Kwon commented on SPARK-34600:
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[~eddyxu] if this ticket is an umbrella ticket, let's create another JIRA and
move your PR (https://github.com/apache/spark/pull/31735) to that JIRA.
umbrella JIRA doesn't usually have a PR against it.
> Support user defined types in Pandas UDF
> ----------------------------------------
>
> Key: SPARK-34600
> URL: https://issues.apache.org/jira/browse/SPARK-34600
> Project: Spark
> Issue Type: New Feature
> Components: PySpark, SQL
> Affects Versions: 3.0.2, 3.1.1
> Reporter: Lei (Eddy) Xu
> Priority: Major
> Labels: pandas, sql, udf
>
> Because Pandas UDF uses pyarrow to passing data, it does not currently
> support UserDefinedTypes, as what normal python udf does.
> For example:
> {code:python}
> class BoxType(UserDefinedType):
> @classmethod
> def sqlType(cls) -> StructType:
> return StructType(
> fields=[
> StructField("xmin", DoubleType(), False),
> StructField("ymin", DoubleType(), False),
> StructField("xmax", DoubleType(), False),
> StructField("ymax", DoubleType(), False),
> ]
> )
> @pandas_udf(
> returnType=StructType([StructField("boxes", ArrayType(Box()))]
> )
> def pandas_pf(s: pd.DataFrame) -> pd.DataFrame:
> yield s
> {code}
> The logs show
> {code}
> try:
> to_arrow_type(self._returnType_placeholder)
> except TypeError:
> > raise NotImplementedError(
> "Invalid return type with scalar Pandas UDFs: %s is "
> E NotImplementedError: Invalid return type with scalar
> Pandas UDFs: StructType(List(StructField(boxes,ArrayType(Box,true),true))) is
> not supported
> {code}
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