Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/4416#discussion_r24254686
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala
---
@@ -88,17 +88,26 @@ private[sql] class DataFrameImpl protected[sql](
}
}
- override def toDataFrame(colName: String, colNames: String*): DataFrame
= {
- val newNames = colName +: colNames
- require(schema.size == newNames.size,
+ override def toDataFrame(colNames: String*): DataFrame = {
+ require(schema.size == colNames.size,
"The number of columns doesn't match.\n" +
"Old column names: " + schema.fields.map(_.name).mkString(", ") +
"\n" +
- "New column names: " + newNames.mkString(", "))
-
- val newCols = schema.fieldNames.zip(newNames).map { case (oldName,
newName) =>
- apply(oldName).as(newName)
+ "New column names: " + colNames.mkString(", "))
+
+ logicalPlan match {
+ case LocalRelation(outputAttributes, data) =>
--- End diff --
why is this not in the optimizer?
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