docs: def reference(cls, value):
          """
          Convert as reference on column.
          table => "table"
          table.column => "table"."column"
          db.table.column => "db"."table"."column"
          table."col.umn" => "table"."col.umn"
          "table"."col.umn" => "table"."col.umn"
          """
          from sqlpuzzle._common.utils import force_text
          value = force_text(value)
          parts = re.split(r'{quote}([^{quote}]+){quote}|\.'.format(quote=cls.reference_quote), value)
          parts = ('{quote}{i}{quote}'.format(quote=cls.reference_quote, i=i) if i != '*' else i for i in parts if i)
          return '.'.join(parts)