Github user viirya commented on a diff in the pull request:
https://github.com/apache/spark/pull/19229#discussion_r140680794
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Dataset.scala ---
@@ -2102,6 +2102,55 @@ class Dataset[T] private[sql](
}
/**
+ * Returns a new Dataset by adding columns or replacing the existing
columns that has
+ * the same names.
+ */
+ private[spark] def withColumns(colNames: Seq[String], cols:
Seq[Column]): DataFrame = {
+ require(colNames.size == cols.size,
+ s"The size of column names: ${colNames.size} isn't equal to " +
+ s"the size of columns: ${cols.size}")
+ require(colNames.distinct.size == colNames.size,
--- End diff --
Good point.
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