maropu commented on a change in pull request #27836: [SPARK-31009][SQL] Support
json_object_keys function
URL: https://github.com/apache/spark/pull/27836#discussion_r396158863
##########
File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
##########
@@ -796,3 +797,63 @@ case class SchemaOfJson(
override def prettyName: String = "schema_of_json"
}
+
+/**
+ * A function which returns all the keys of outer JSON object.
+ */
+@ExpressionDescription(
+ usage = "_FUNC_(json_object) - returns all the keys of outer JSON object.",
+ arguments = """
+ Arguments:
+ * json_object - A JSON object is required as argument. `Null` is
returned, if an invalid JSON
+ string is given. `Runtime Exception` is thrown, if null string or
JSON array is given.
Review comment:
How about this?
```
* json_object - A JSON object. If it is an invalid string, the
function returns null.
If it is a JSON array or null, a runtime exception will be
thrown.
```
btw, the error handling is consistent with the other JSON functions?
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