Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85625758
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregate/collect.scala
---
@@ -106,10 +110,14 @@ case class CollectList(
}
/**
- * Collect a list of unique elements.
+ * Collect a set of unique elements.
*/
@ExpressionDescription(
- usage = "_FUNC_(expr) - Collects and returns a set of unique elements.")
+ usage = "_FUNC_(expr) - Collects and returns a set of unique elements.",
+ extended = """
+ Arguments:
+ expr - an expression of any type that represents data to collect as
a set.
+ """)
--- End diff --
```sql
spark-sql> SELECT collect_set(array(1)), collect_set(struct(1));
[[1]] [{"col1":1}]
```
---
If your project is set up for it, you can reply to this email and have your
reply appear on GitHub as well. If your project does not have this feature
enabled and wishes so, or if the feature is enabled but not working, please
contact infrastructure at infrastruct...@apache.org or file a JIRA ticket
with INFRA.
---
---------------------------------------------------------------------
To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org
For additional commands, e-mail: reviews-h...@spark.apache.org
