Github user rxin commented on a diff in the pull request: https://github.com/apache/spark/pull/4592#discussion_r24766338 --- Diff: sql/core/src/main/scala/org/apache/spark/sql/DataFrameImpl.scala --- @@ -88,12 +88,12 @@ private[sql] class DataFrameImpl protected[sql]( } } - protected[sql] def numericColumns: Seq[Expression] = { + protected[sql] def numericColumns(): Seq[Expression] = { --- End diff -- why adding the parentheses here? it's ok i will merge it and fix it.
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