Vladimir Feinberg created SPARK-15989:
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Summary: PySpark SQL python-only UDTs don't support nested types
Key: SPARK-15989
URL: https://issues.apache.org/jira/browse/SPARK-15989
Project: Spark
Issue Type: Bug
Components: PySpark
Affects Versions: 2.0.0
Reporter: Vladimir Feinberg
Priority: Blocker
[This
notebook|https://databricks-prod-cloudfront.cloud.databricks.com/public/4027ec902e239c93eaaa8714f173bcfc/6001574963454425/611202526513296/1653464426712019/latest.html]
demonstrates the bug.
The obvious issue is that nested UDTs are not supported if the UDT is
Python-only. Looking at the exception thrown, this seems to be because the
encoder on the Java end tries to encode the UDT as a Java class, which doesn't
exist for the [[PythonOnlyUDT]].
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