Ziya Mukhtarov created SPARK-56045:
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Summary: Parquet UNKNOWN Type Regression at Spark 4.1
Key: SPARK-56045
URL: https://issues.apache.org/jira/browse/SPARK-56045
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 4.1.1, 4.1.0
Reporter: Ziya Mukhtarov
Since Spark 4.1, which includes
[SPARK-54220|https://issues.apache.org/jira/browse/SPARK-54220] NullType
support in Parquet, the Parquet reader behavior for files written by external
engines have changed. If the file contains a column type with UNKNOWN logical
type annotation, before we were inferring a type based on the physical type,
but since Spark 4.1, we are inferring NullType. As it is a regression, we need
to introduce a new flag to control this behavior, with the default value
resulting in the old behavior.
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