Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85625172
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala
---
@@ -86,7 +86,11 @@ abstract class Collect extends ImperativeAggregate {
* Collect a list of elements.
*/
@ExpressionDescription(
- usage = "_FUNC_(expr) - Collects and returns a list of non-unique
elements.")
+ usage = "_FUNC_(expr) - Collects and returns a list of non-unique
elements.",
+ extended = """
+ Arguments:
+ expr - an expression of any type that represents data to collect as
a list.
--- End diff --
```sql
spark-sql> SELECT collect_list(array(1)), collect_list(struct(1)),
collect_list(map(1, 1));
[[1]] [{"col1":1}] [{1:1}]
```
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