# File lib/dm-core/adapters/postgres_adapter.rb, line 33
        def field_exists?(storage_name, column_name)
          statement = "SELECT COUNT(*)\nFROM \"pg_class\"\nJOIN \"pg_attribute\" ON \"pg_class\".\"oid\" = \"pg_attribute\".\"attrelid\"\nWHERE \"pg_attribute\".\"attname\" = ?\nAND \"pg_class\".\"relname\" = ?\nAND \"pg_attribute\".\"attnum\" >= 0\n".compress_lines

          query(statement, column_name, storage_name).first > 0
        end