isdomain field definition

layers_select.sql

SELECT
  tbls.schemaname AS schemaname,
  tbls.tablename AS tablename,
  a.attname AS primary_key,
  g.f_geometry_column AS geometry_column,
  g.srid AS srid,
  g.type AS type,
  (cols.column_name = 'ilicode') AS isdomain
FROM pg_catalog.pg_tables tbls
LEFT JOIN pg_index i
  ON i.indrelid = CONCAT(tbls.schemaname, '.', tbls.tablename)::regclass
LEFT JOIN pg_attribute a
  ON a.attrelid = i.indrelid
  AND a.attnum = ANY(i.indkey)
LEFT JOIN public.geometry_columns g
  ON g.f_table_schema = tbls.schemaname
  AND g.f_table_name = tbls.tablename
LEFT JOIN information_schema.columns cols
  ON cols.table_schema = tbls.schemaname
  AND cols.table_name = tbls.tablename
  AND column_name = 'ilicode'
WHERE i.indisprimary