CHECKs are associated with a column instead of the domain of the column

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WITH simple_checks AS (SELECT 
(SELECT nspname FROM pg_namespace WHERE oid=c.relnamespace) AS table_schema,
c.relname as table_name, 
a.attname AS column_name,
o.conname,
substring(pg_get_constraintdef(o.oid),7) AS check_clause
FROM pg_constraint o INNER JOIN pg_class c ON c.oid = o.conrelid
INNER JOIN pg_attribute a ON a.attrelid = c.oid AND a.attnum = o.conkey[1] AND a.attisdropped = FALSE
WHERE cardinality(o.conkey)=1 AND o.contype = 'c' AND c.relkind = 'r'),
simple_checks_agg AS (SELECT table_schema, table_name, column_name, string_agg(check_clause,';<br>' ORDER BY conname) AS column_checks
FROM simple_checks
GROUP BY table_schema, table_name, column_name),
column_domain_usage AS (SELECT cdu.domain_schema, cdu.domain_name, cdu.table_schema, cdu.table_name, cdu.column_name
FROM INFORMATION_SCHEMA.column_domain_usage AS cdu INNER JOIN INFORMATION_SCHEMA.tables AS t USING (table_schema, table_name) 
WHERE t.table_type='BASE TABLE' AND 
cdu.table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND catalog_name IS NOT NULL AND schema_name IS NOT NULL))
SELECT cdu.domain_schema, domain_name, sc.table_schema, sc.table_name, sc.column_name, sc.column_checks
FROM simple_checks_agg sc INNER JOIN column_domain_usage cdu USING (table_schema, table_name, column_name)
ORDER BY cdu.domain_schema, domain_name, sc.table_schema, sc.table_name, sc.column_name;