Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/5357#discussion_r28609773
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -344,6 +344,20 @@ object functions {
*/
def abs(e: Column): Column = Abs(e.expr)
+ /**
+ * Aggregate func:compute the stddev of the specific column.
+ *
+ * @group agg_funcs
+ */
+ def stddev(columnName: String): Column = stddev(Column(columnName))
+
+ /**
+ * Aggregate func:compute the stddev of the specific column
+ *
+ * @group agg_funcs
+ */
+ def stddev(e: Column): Column = StdDeviation(e.expr)
--- End diff --
can you move these two functions to the aggregate function section, and
change the comment to say
```
Aggregate function: Computes the standard deviation of the specific column.
```
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at [email protected] or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
