[pg] Support USING

[rekby]

Query:

SELECT pg_type.oid, typname   
FROM pg_catalog.pg_type   
LEFT   JOIN (select ns.oid as nspoid, ns.nspname, r.r         
  from pg_namespace as ns           
join ( select s.r, (current_schemas(false))[s.r] as nspname                   
 from generate_series(1, array_upper(current_schemas(false), 1)) as s(r) ) as r          using ( nspname )        ) as sp     
ON sp.nspoid = typnamespace  
WHERE typname = $1  ORDER BY sp.r, pg_type.oid DESC LIMIT 1

Error:

Status: GENERIC_ERROR
Issues: 
<main>:1:1: Error: JoinExpr: unsupported using

[MrLolthe1st]

#2544