L. C. Hsieh created SPARK-49352:
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Summary: Avoid redundant array transform for identical expression
Key: SPARK-49352
URL: https://issues.apache.org/jira/browse/SPARK-49352
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 4.0.0
Reporter: L. C. Hsieh
Our customer encounters significant performance regression when migrating from
Spark 3.2 to Spark 3.4 on a `Insert Into` query which is analyzed as a
`AppendData` on an Iceberg table.
We found that the root cause is in Spark 3.4, `TableOutputResolver` resolves
the query with additional `ArrayTransform` on an `ArrayType` field. The
`ArrayTransform`'s lambda function is actually an identical function, i.e., the
transformation is redundant.
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