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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