allow comments on columns and tables

Author: maikhanhbui

mssql/features.py

@@ -33,6 +33,7 @@ class DatabaseFeatures(BaseDatabaseFeatures):
     requires_literal_defaults = True
     requires_sqlparse_for_splitting = False
     supports_boolean_expr_in_select_clause = False
+    supports_comments = True
     supports_covering_indexes = True
     supports_deferrable_unique_constraints = False
     supports_expression_indexes = False