BUG26840009: Fix generating field names

A field in the projection would be given as [field] AS [alias].
If alias is not provided, we would use the full field name. There
should be no other condition.

Tests have been added for regression.

Author: amitab

lib/mysqlx/expr.py

@@ -1165,10 +1165,6 @@ def parse_table_select_projection(self):
             if self.cur_token_type_is(TokenType.AS):
                 self.consume_token(TokenType.AS)
                 projection["alias"] = self.consume_token(TokenType.IDENT)
-            elif get_item_or_attr(projection["source"], "type") is \
-                mysqlxpb_enum("Mysqlx.Expr.Expr.Type.IDENT"):
-                self.pos -= 1
-                projection["alias"] = self.consume_token(TokenType.IDENT)
             else:
                 projection["alias"] = fields[len(project_expr)]
             project_expr.append(projection.get_message())

tests/test_mysqlx_crud.py

@@ -1163,6 +1163,11 @@ def test_find(self):
         docs = result.fetch_all()
         self.assertTrue("$.age + 100" in docs[0].keys())
 
+        # tests comma seperated fields
+        result = collection.find("$.age = 21").fields("$.age, $.name").execute()
+        docs = result.fetch_all()
+        self.assertEqual("Fred", docs[0]['$.name'])
+
         self.schema.drop_collection(collection_name)
 
     def test_modify(self):