Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85624768
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
---
@@ -114,8 +114,16 @@ object Cast {
/** Cast the child expression to the target data type. */
@ExpressionDescription(
- usage = " - Cast value v to the target data type.",
- extended = "> SELECT _FUNC_('10' as int);\n 10")
+ usage = "_FUNC_(expr AS type) - Casts the value `expr` to the target
data type `type`.",
+ extended = """
+ Arguments:
+ expr - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT cast(array(1) as string), cast(struct(1) as string),
cast(map(1,1) as string);
[1] [1] keys: [1], values: [1]
```
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