Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85626278
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/nullExpressions.scala
---
@@ -34,9 +34,18 @@ import org.apache.spark.sql.types._
* coalesce(null, null, null) => null
* }}}
*/
+// scalastyle:off line.size.limit
@ExpressionDescription(
- usage = "_FUNC_(a1, a2, ...) - Returns the first non-null argument if
exists. Otherwise, NULL.",
- extended = "> SELECT _FUNC_(NULL, 1, NULL);\n 1")
+ usage = "_FUNC_(expr1, expr2, ...) - Returns the first non-null argument
if exists. Otherwise, null.",
+ extended = """
+ Arguments:
+ expr - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT coalesce(array(1)), coalesce(struct(1)), coalesce(map(1,
1));
[1] {"col1":1} {1:1}
```
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