Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85626717
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -282,7 +359,15 @@ case class IsNull(child: Expression) extends
UnaryExpression with Predicate {
* An expression that is evaluated to true if the input is not null.
*/
@ExpressionDescription(
- usage = "_FUNC_(a) - Returns true if a is not NULL and false otherwise.")
+ usage = "_FUNC_(expr) - Returns true if `expr` is not null and false
otherwise.",
+ extended = """
+ Arguments:
+ expr - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT isnotnull(array(1)), isnotnull(struct(1)),
isnotnull(map(1, 1));
true true true
```
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