Github user HyukjinKwon commented on a diff in the pull request:
https://github.com/apache/spark/pull/15513#discussion_r85626558
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/misc.scala
---
@@ -490,7 +521,15 @@ abstract class InterpretedHashFunction {
* and bucketing have same data distribution.
*/
@ExpressionDescription(
- usage = "_FUNC_(a1, a2, ...) - Returns a hash value of the arguments.")
+ usage = "_FUNC_(expr1, expr2, ...) - Returns a hash value of the
arguments.",
+ extended = """
+ Arguments:
+ expr - an expression of any type.
--- End diff --
```sql
spark-sql> SELECT hash(struct(1));
-559580957
Time taken: 0.027 seconds, Fetched 1 row(s)
spark-sql> SELECT hash(array(1));
-559580957
Time taken: 0.021 seconds, Fetched 1 row(s)
spark-sql> SELECT hash(map(1, 1));
245521047
```
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