Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85626782
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/predicates.scala
---
@@ -114,7 +118,11 @@ case class Not(child: Expression)
* Evaluates to `true` if `list` contains `value`.
*/
@ExpressionDescription(
- usage = "expr _FUNC_(val1, val2, ...) - Returns true if expr equals to
any valN.")
+ usage = "expr1 _FUNC_(expr2, expr3, ...) - Returns true if `expr` equals
to any valN.",
+ extended = """
+ Arguments:
+ expr - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT array(1) in(array(1)), struct(1) in(struct(1)), map(1,1)
in(map(1, 1));
true true false
```
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