[GitHub] [spark] iRakson commented on a change in pull request #27836: [SPARK-31009][SQL] Support json_object_keys function

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iRakson 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_r403478095
 
 

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 File path: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/jsonExpressions.scala
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 @@ -796,3 +797,64 @@ 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. If it is an invalid string, the function returns null.
+          If it is a JSON array or null, a runtime exception will be thrown.
 
 Review comment:
   Actually I used `null` here for null string(`''`).

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