Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6938#discussion_r33014227
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -1266,6 +1266,30 @@ object functions {
def rint(columnName: String): Column = rint(Column(columnName))
/**
+ * Returns the value of the `e` rounded to 0 decimal places.
+ *
+ * @group math_funcs
+ * @since 1.5.0
+ */
+ def round(e: Column): Column = Round(Seq(e.expr))
+
+ /**
+ * Returns the value of `e` rounded to the value of `scale` decimal
places.
+ *
+ * @group math_funcs
+ * @since 1.5.0
+ */
+ def round(e: Column, scale: Column): Column = Round(Seq(e.expr,
scale.expr))
+
+ /**
+ * Returns the value of `e` rounded to `scale` decimal places.
+ *
+ * @group math_funcs
+ * @since 1.5.0
+ */
+ def round(e: Column, scale: Int): Column = round(e, lit(scale))
--- End diff --
We need to support the string version of API. e.g.
```scala
def round(columnName: String, scale: Int): Column
```
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