cloud-fan commented on a change in pull request #31993:
URL: https://github.com/apache/spark/pull/31993#discussion_r615556485
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/HadoopFsRelation.scala
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@@ -40,7 +40,7 @@ import org.apache.spark.sql.types.{StructField, StructType}
case class HadoopFsRelation(
location: FileIndex,
partitionSchema: StructType,
- dataSchema: StructType,
+ dataSchema: StructType, // The top-level columns should not be pruned.
Please see SPARK-34897.
Review comment:
Can we put more details?
```
// The top-level columns in `dataSchema` should match the actual physical
file schema, otherwise
// the ORC data source may not work with the by-ordinal mode.
```
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