Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85626365
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -106,7 +125,17 @@ case class IfNull(left: Expression, right: Expression)
extends RuntimeReplaceabl
}
-@ExpressionDescription(usage = "_FUNC_(a,b) - Returns null if a equals to
b, or a otherwise.")
+@ExpressionDescription(
+ usage = "_FUNC_(expr1, expr2) - Returns null if `expr1` equals to
`expr2`, or `expr1` otherwise.",
+ extended = """
+ Arguments:
+ expr1 - an expression of any type.
+ expr2 - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT nullif(array(1), array(1)), nullif(struct(1), struct(1)),
nullif(map(1,1), map(1, 1));
NULL NULL {1:1}
```
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