Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85626037
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -162,7 +172,15 @@ abstract class CaseWhenBase(
*/
// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "CASE WHEN a THEN b [WHEN c THEN d]* [ELSE e] END - When a =
true, returns b; when c = true, return d; else return e.")
+ usage = "CASE WHEN expr1 THEN expr2 [WHEN expr3 THEN expr4]* [ELSE
expr5] END - When `expr1` = true, returns `expr2`; when `expr3` = true, return
`expr4`; else return `expr5`.",
+ extended = """
+ Arguments:
+ expr1 - a boolean expression.
+ expr2 - an expression of any type.
+ expr3 - a boolean expression.
+ expr4 - an expression of any type.
+ expr5 - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT CASE WHEN true THEN array(1) WHEN true THEN array(1) ELSE
array(1) END;
[1]
spark-sql> SELECT CASE WHEN true THEN struct(1) WHEN true THEN struct(1)
ELSE struct(1) END;
{"col1":1}
spark-sql> SELECT CASE WHEN true THEN map(1, 1) WHEN true THEN map(1, 1)
ELSE map(1, 1) END;
{1:1}
```
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