Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85625801
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/arithmetic.scala
---
@@ -531,7 +615,15 @@ case class Least(children: Seq[Expression]) extends
Expression {
* It takes at least 2 parameters, and returns null iff all parameters are
null.
*/
@ExpressionDescription(
- usage = "_FUNC_(n1, ...) - Returns the greatest value of all parameters,
skipping null values.")
+ usage = "_FUNC_(expr, ...) - Returns the greatest value of all
parameters, skipping null values.",
+ extended = """
+ Arguments:
+ expr - an expression of any type.
+
--- End diff --
```sql
spark-sql> SELECT greatest(array(1), array(1)), least(struct(1), struct(1));
[1] {"col1":1}
```
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