Hyukjin Kwon created SPARK-28359:
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Summary: Make integrated UDF tests robust by making them no-op
Key: SPARK-28359
URL: https://issues.apache.org/jira/browse/SPARK-28359
Project: Spark
Issue Type: Bug
Components: PySpark, SQL
Affects Versions: 3.0.0
Reporter: Hyukjin Kwon
Current UDFs available in `IntegratedUDFTestUtils` are not exactly no-op. It
converts input column to strings and outputs to strings.
This causes many issues, for instance,
https://github.com/apache/spark/pull/25128 or
https://github.com/apache/spark/pull/25110
Ideally we should make this UDF virtually noop.
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