cloud-fan commented on a change in pull request #34575:
URL: https://github.com/apache/spark/pull/34575#discussion_r772199075
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/FileSourceStrategy.scala
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@@ -225,8 +238,18 @@ object FileSourceStrategy extends Strategy with
PredicateHelper with Logging {
dataFilters,
table.map(_.identifier))
+ // extra Project node: wrap flat metadata columns to a metadata struct
+ val withMetadataProjections = metadataStructOpt.map { metadataStruct =>
+ val metadataAlias =
+ Alias(CreateStruct(metadataColumns), METADATA_NAME)(exprId =
metadataStruct.exprId)
+ execution.ProjectExec(
+ scan.output.filterNot(metadataColumns.contains) :+ metadataAlias,
scan)
Review comment:
nit: `scan.output.dropRight(metadataColumns.length)`
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