Github user davies commented on a diff in the pull request:
https://github.com/apache/spark/pull/6297#discussion_r39227939
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -295,6 +295,60 @@ object functions {
def min(columnName: String): Column = min(Column(columnName))
/**
+ * Aggregate function: returns the unbiased sample standard deviation
+ * of the expression in a group.
+ *
+ * @group agg_funcs
+ * @since 1.6.0
+ */
+ def stddev(e: Column): Column = Stddev(e.expr)
+
+ /**
+ * Aggregate function: returns the unbiased sample standard deviation
+ * of the column in a group.
+ *
+ * @group agg_funcs
+ * @since 1.6.0
+ */
+ def stddev(columnName: String): Column = stddev(Column(columnName))
--- End diff --
We may don't want this one anymore.
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