fix(tsql)!: Properly set 'this' when parsing IDENTITY (#4719)

* fix(tsql): Properly set 'this' when parsing IDENTITY

* hopefully fix the formatting error

Author: amachanic

sqlglot/parser.py

@@ -5707,7 +5707,9 @@ def _parse_auto_increment(
             increment = self._parse_bitwise()
 
         if start and increment:
-            return exp.GeneratedAsIdentityColumnConstraint(start=start, increment=increment)
+            return exp.GeneratedAsIdentityColumnConstraint(
+                start=start, increment=increment, this=False
+            )
 
         return exp.AutoIncrementColumnConstraint()
 

tests/dialects/test_tsql.py

@@ -926,6 +926,7 @@ def test_ddl(self):
             },
             write={
                 "databricks": "CREATE TABLE tbl (id BIGINT NOT NULL GENERATED ALWAYS AS IDENTITY (START WITH 10 INCREMENT BY 1) PRIMARY KEY)",
+                "postgres": "CREATE TABLE tbl (id INT NOT NULL GENERATED BY DEFAULT AS IDENTITY (START WITH 10 INCREMENT BY 1) PRIMARY KEY)",
             },
         )
         self.validate_all(