Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/17737#discussion_r112861744
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -1008,7 +1009,7 @@ class Column(val expr: Expression) extends Logging {
def cast(to: String): Column = cast(CatalystSqlParser.parseDataType(to))
/**
- * Returns an ordering used in sorting.
+ * Returns a sort expression based on the descending order of the column.
--- End diff --
This and the similar instances below are matched with `functions.scala`.
They look calling the same ones.
> Returns a sort expression based on the descending order of the column.
> Returns a sort expression based on the descending order of the column,
> and null values appear before non-null values.
> Returns a sort expression based on the descending order of the column,
> and null values appear after non-null values.
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