                 from access_log | filter cs_method == 'GET' || cs_method == 'PUT'
      prql_stage ----------------
  prql_transform ----
      prql_ident      ----------
       prql_fqid      ----------
      prql_stage                 -------------------------------------------------
       prql_pipe                 -
  prql_transform                   ------
      prql_ident                          ---------
       prql_fqid                          ---------
       prql_oper                                    --
     prql_string                                       -----
       prql_oper                                             --
      prql_ident                                                ---------
       prql_fqid                                                ---------
       prql_oper                                                          --
     prql_string                                                             -----
