handle BINARY keyword in mysql

Author: AbhishekASLK

sqlglot/parser.py

@@ -6877,7 +6877,7 @@ def _parse_convert(
 
         if self._match(TokenType.USING):
             to: t.Optional[exp.Expression] = self.expression(
-                exp.CharacterSet, this=self._parse_var()
+                exp.CharacterSet, this=self._parse_var(tokens={TokenType.BINARY})
             )
         elif self._match(TokenType.COMMA):
             to = self._parse_types()

tests/dialects/test_mysql.py

@@ -573,6 +573,9 @@ def test_convert(self):
                 "mysql": "CAST(x AS CHAR CHARACTER SET latin1)",
             },
         )
+        self.validate_identity(
+            "CONVERT('a' USING binary)", "CAST('a' AS CHAR CHARACTER SET binary)"
+        )
 
     def test_match_against(self):
         self.validate_all(