cloud-fan commented on a change in pull request #34575:
URL: https://github.com/apache/spark/pull/34575#discussion_r752940728
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/DataSourceScanExec.scala
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@@ -194,10 +195,22 @@ case class FileSourceScanExec(
disableBucketedScan: Boolean = false)
extends DataSourceScanExec {
+ lazy val outputMetadataStruct: Option[AttributeReference] =
+ output.collectFirst { case MetadataAttribute(attr) => attr }
Review comment:
This is probably a design problem: do we prefer 4 flat columns or one
struct-type column?
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