Github user chenghao-intel commented on a diff in the pull request:
https://github.com/apache/spark/pull/6822#discussion_r33107473
--- Diff: sql/core/src/main/scala/org/apache/spark/sql/functions.scala ---
@@ -995,6 +995,22 @@ object functions {
def expm1(columnName: String): Column = expm1(Column(columnName))
/**
+ * Computes the factorial of the given value.
+ *
+ * @group math_funcs
+ * @since 1.5.0
+ */
+ def factorial(e: Column): Column = Factorial(e.expr)
+
+ /**
+ * Computes the factorial of the given column.
+ *
+ * @group math_funcs
+ * @since 1.5.0
+ */
+ def factorial(columnName: String): Column = factorial(Column(columnName))
--- End diff --
And also add the function with integer as parameter.
```scala
def factorial(index: Int): Column
```
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