allow single-quote alias names

mo_sql_parsing/sql_parser.py

@@ -237,12 +237,14 @@ def matching(type):
             + RB
         ) / to_json_call
 
+        single_quote_name = Regex(r"\'(\'\'|[^'])*\'") / (lambda x: single_literal(x)['literal'])
+
         alias = Optional((
             (
                 (
-                    AS + (ident("name") + Optional(LB + delimited_list(ident("col")) + RB))
+                    AS + ((ident|single_quote_name)("name") + Optional(LB + delimited_list(ident("col")) + RB))
                     | (
-                        identifier("name")
+                          (identifier|single_quote_name)("name")
                         + Optional((LB + delimited_list(ident("col")) + RB) | (AS + delimited_list(identifier("col"))))
                     )
                 )

tests/test_resources.py

@@ -890,7 +890,15 @@ def test_116(self):
 
     def test_118a(self):
         sql = "SELECT * FROM t3 UNION SELECT 3 AS 'a', 4 ORDER BY a"
-        self.assertRaises(Exception, parse, sql)
+        result = parse(sql)
+        expected = {
+            "from": {"union": [
+                {"from": "t3", "select": {"all_columns": {}}},
+                {"select": [{"value": 3, "name": "a"}, {"value": 4}]},
+            ]},
+            "orderby": {"value": "a"},
+        }
+        self.assertEqual(result, expected)
 
     def test_118b(self):
         sql = 'SELECT * FROM t3 UNION SELECT 3 AS "a", 4 ORDER BY a'

tests/test_sql_server.py

@@ -348,3 +348,9 @@ def test_issue_237_declare_multiple_vars_with_code(self):
             ]},
         }}
         self.assertEqual(result, expected)
+
+    def test_issue247(self):
+        sql = "select 42 'some_alias'"
+        result = parse(sql)
+        expected = {'select': {'name': 'some_alias', 'value': 42}}
+        self.assertEqual(result, expected)