BUG23582924: Fix array append operation of mysqlx.ModifyStatement

Using array_append with ModifyStatement results in AttributeError:
AttributeError: 'EnumTypeWrapper' object has no attribute 'ARRAY_APPEND'

`ARRAY_APPEND` is an enum value of `MySQLxCrud.UpdateOperation`.
Removing `UpdateType` from `MySQLxCrud.UpdateOperation.UpdateType`
resolves the issue.

Tests were added for regression.

Author: amitab

lib/mysqlx/statement.py

@@ -349,8 +349,8 @@ def array_append(self, doc_path, value):
             mysqlx.ModifyStatement: ModifyStatement object.
         """
         self._update_ops.append(
-            UpdateSpec(MySQLxCrud.UpdateOperation.UpdateType.ARRAY_APPEND,
-                       doc_path, value))
+            UpdateSpec(MySQLxCrud.UpdateOperation.ARRAY_APPEND, doc_path,
+                       value))
         return self
 
     def execute(self):

tests/test_mysqlx_crud.py

@@ -333,6 +333,18 @@ def test_parameter_binding(self):
         self.assertEqual(1, len(docs))
         self.assertEqual("Wilma", docs[0]["name"])
 
+    def test_array_append(self):
+        collection_name = "collection_test"
+        collection = self.schema.create_collection(collection_name)
+        collection.add(
+            {"_id": 1, "name": "Fred", "cards": []},
+            {"_id": 2, "name": "Barney", "cards": [1, 2, 4]},
+            {"_id": 3, "name": "Wilma", "cards": []},
+            {"_id": 4, "name": "Betty", "cards": []},
+        ).execute()
+        collection.modify("$._id == 2").array_append("$.cards[1]", 3).execute()
+        docs = collection.find("$._id == 2").execute().fetch_all()
+        self.assertEqual([1, [2, 3], 4], docs[0]["cards"])
 
 @unittest.skipIf(tests.MYSQL_VERSION < (5, 7, 12), "XPlugin not compatible")
 class MySQLxTableTests(tests.MySQLxTests):