Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/18106#discussion_r123827347
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -2067,6 +2067,18 @@ object functions {
*/
def radians(columnName: String): Column = radians(Column(columnName))
+ /**
+ * returns number truncated by specified decimal places.
+ *
+ * @param scale: 4. -4, 0
+ *
+ * @group math_funcs
+ * @since 2.3.0
+ */
+ def trunc(db: Column, scale: Int = 0): Column = withExpr {
--- End diff --
I would avoid using default value here unless we are very sure on this
(e.g., other languages can call this without any problem, this guarantees
method signature and does not break binary compatibility and etc.).
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