Yang Jie created SPARK-39388:
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Summary: Reuse orcScheam when push down Orc predicates
Key: SPARK-39388
URL: https://issues.apache.org/jira/browse/SPARK-39388
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 3.4.0
Reporter: Yang Jie
`OrcUtils.readCatalystSchema` method will trigger a file IO to read `orcSchema`
when Orc pushes down predicates.
After SPARK-37463:
- For `OrcFileFormat`, we can reuse [a read
`orcSchema`](https://github.com/apache/spark/blob/cc0bf563b8caea21da5692f05e34b5f77e002ab9/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/orc/OrcFileFormat.scala#L146)
to save this file read IO when Orc pushes down predicates
- For `OrcPartitionReaderFactory` we can achieve the same goal by moving
`OrcFile.createReader` before `pushDownPredicates`.
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