Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/20962#discussion_r178691892
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/Column.scala ---
@@ -1083,10 +1083,10 @@ class Column(val expr: Expression) extends Logging {
* and null values return before non-null values.
* {{{
* // Scala: sort a DataFrame by age column in ascending order and
null values appearing first.
- * df.sort(df("age").asc_nulls_last)
+ * df.sort(df("age").asc_nulls_first)
*
* // Java
- * df.sort(df.col("age").asc_nulls_last());
+ * df.sort(df.col("age").asc_nulls_first());
--- End diff --
nice
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