Github user cloud-fan commented on a diff in the pull request: https://github.com/apache/spark/pull/22320#discussion_r214645372 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/DataSource.scala --- @@ -495,7 +496,9 @@ case class DataSource( s"Unable to resolve $name given [${data.output.map(_.name).mkString(", ")}]") } } - val resolved = cmd.copy(partitionColumns = resolvedPartCols, outputColumns = outputColumns) + val resolved = cmd.copy( + partitionColumns = resolvedPartCols, + outputColumnNames = outputColumns.map(_.name)) --- End diff -- why can't we use `outputColumnNames` directly here?
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