same gis query

select `WKT`,
    `C1`,
    `C2`
from 
(
    select `WKT`,
        sum(`area`) as `C1`,
        min(`WKT`) as `C2`
    from 
    (
        WITH
  xxx AS (
  SELECT
    *
  FROM
    UNNEST( ['POINT(138.6780384 -31.0947747)','POINT(138.4236902 -30.5530431)','POINT(138.4236351 -30.5558298)','POINT(138.4214329 -31.8875526)','POINT(138.0427624 -32.3463532)','POINT(138.0422809 -32.3464209)','POINT(138.0414668 -32.3468268)','POINT(137.7437191 -32.4616685)'] ) AS element),
  yyy AS (
  SELECT
    ST_CONVEXHULL( ST_UNION_AGG(ST_GEOGFROMTEXT(element))) AS geo
  FROM
    xxx)
SELECT
  ST_ASTEXT(geo) AS WKT,
  st_area(geo) AS area
FROM
  yyy
    ) as `_`
    group by `WKT`
) as `ITBL`
where not `C1` is null or not `C2` is null
LIMIT 1000001 OFFSET 0