ENH: Implemented order of operations with parentheses for algebraic expressions

Author: zbrookle

dataframe_sql/grammar/sql.grammar

@@ -59,7 +59,10 @@ column_name: [NAME "."] NAME
                   | expression_product "/" expression_parens -> expression_div
 
 ?expression_parens: expression
-                  | "(" expression_parens "*" expression ")"
+                  | "(" expression_parens "*" expression ")" -> expression_mul
+                  | "(" expression_parens "/" expression ")" -> expression_div
+                  | "(" expression_parens "+" expression ")" -> expression_add
+                  | "(" expression_parens "-" expression ")" -> expression_sub
 
 ?expression: [NAME "."] (NAME | STAR) -> column_name
             | literal

dataframe_sql/tests/pandas_sql_functionality_test.py

@@ -1433,6 +1433,6 @@ def test_order_of_operations_with_parens():
 if __name__ == "__main__":
     register_env_tables()
 
-    test_sum()
+    test_order_of_operations_with_parens()
 
     remove_env_tables()