WITH columns_with_domains_chk AS (
SELECT cdu.table_schema, cdu.table_name, t.table_type, cdu.column_name, (SELECT data_type FROM INFORMATION_SCHEMA.domains AS d
WHERE d.domain_schema=dc.domain_schema AND d.domain_name=dc.domain_name) AS data_type, cc.check_clause, cc.constraint_name
FROM INFORMATION_SCHEMA.column_domain_usage AS cdu INNER JOIN INFORMATION_SCHEMA.tables AS t USING (table_schema, table_name)
INNER JOIN INFORMATION_SCHEMA.domain_constraints AS dc USING (domain_schema, domain_name)
INNER JOIN INFORMATION_SCHEMA.check_constraints AS cc USING (constraint_schema, constraint_name)
WHERE t.table_type IN ('BASE TABLE', 'FOREIGN') 
AND cc.check_clause NOT LIKE '%IS NOT NULL'    
AND cdu.table_schema NOT IN (SELECT schema_name
FROM INFORMATION_SCHEMA.schemata
WHERE schema_name<>'public' AND
schema_owner='postgres' AND schema_name IS NOT NULL)),

simple_chk AS (SELECT 
(SELECT nspname FROM pg_namespace WHERE oid=c.relnamespace) AS table_schema,
c.relname as table_name, 
CASE WHEN c.relkind='r' THEN 'BASE TABLE' ELSE 'FOREIGN' END AS table_type,
a.attname AS column_name,
t.typname AS type_name,
substring(pg_get_constraintdef(o.oid),7) AS check_clause,
o.conname AS constraint_name
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
INNER JOIN pg_type t ON a.atttypid=t.oid
WHERE cardinality(o.conkey)=1 
AND o.contype = 'c' 
AND c.relkind IN ('r','f')
UNION SELECT table_schema, table_name, table_type, column_name, data_type, check_clause, constraint_name
FROM columns_with_domains_chk),

inheritance AS (SELECT pn.nspname AS parent_schema, p.relname AS parent_table, pc.nspname AS child_schema,  c.relname AS child_table,
c.relispartition AS child_is_partition
FROM pg_inherits pi INNER JOIN pg_class p ON pi.inhparent=p.oid
INNER JOIN pg_namespace pn ON p.relnamespace=pn.oid
INNER JOIN pg_authid AS ap ON pn.nspowner=ap.oid
INNER JOIN pg_class c ON pi.inhrelid=c.oid
INNER JOIN pg_namespace pc ON c.relnamespace=pc.oid
INNER JOIN pg_authid AS ac ON pc.nspowner=ac.oid
WHERE (pn.nspname='public' OR ap.rolname<>'postgres') 
AND (pc.nspname='public' OR ac.rolname<>'postgres')),

one_value AS (SELECT  table_schema, table_name, table_type, column_name, type_name, constraint_name, check_clause, is_nullable, i.parent_schema AS supertable_schema, i.parent_table AS supertable_name
FROM simple_chk AS ch INNER JOIN INFORMATION_SCHEMA.columns AS c USING(table_schema, table_name, column_name)
LEFT JOIN inheritance AS i ON c.table_schema=i.child_schema AND c.table_name=i.child_table
WHERE check_clause~'[[:space:]](=)[[:space:]]' 
AND check_clause!~*'[[:space:]]any[[:space:]][\(]+array\[' 
AND check_clause!~*'(<|>|<>|>=|<=)' 
AND check_clause!~*'(left|right|substring)' 
AND check_clause!~*'[[:space:]](and|or)[[:space:]]' 
AND check_clause !~* ( '([[:alnum:]]|_)+[(]+' || column_name || '[)]+')
AND check_clause !~* ( '([[:alnum:]]|_)+[(]+value[)]+')
AND check_clause !~* ( '(current_date|current_timestamp|localtimestamp|now()|clock_timestamp|statement_timestamp|transaction_timestamp)')),

constr as (select
o.conname as constraint_name,
(select nspname from pg_namespace where oid=c.relnamespace) as supertable_schema,
c.relname as supertable,
c.oid as supertable_oid,
o.conkey AS constraint_col,
CASE WHEN o.contype='p' THEN 'PRIMARY KEY'
WHEN o.contype='u' THEN 'UNIQUE'
WHEN o.contype='f' THEN 'FOREIGN KEY'
WHEN o.contype='x' THEN 'EXCLUDE' END AS constraint_type
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
where o.contype in ('f','p','u', 'x')),
constr_unnest as (select constraint_name, constraint_type, supertable_schema, supertable, supertable_oid, constraint_col, constraint_col_num, ordin
from constr, unnest(constr.constraint_col) with ordinality as f(constraint_col_num, ordin)),
constr_with_names as (select constraint_name, constraint_type, supertable_schema, supertable, supertable_oid, array_agg(a_target.attname order by ordin) as constraint_col 
from constr_unnest constr inner join pg_attribute a_target on constr.constraint_col_num = a_target.attnum and constr.supertable_oid = a_target.attrelid and a_target.attisdropped = false
group by constraint_name, constraint_type, supertable_schema, supertable, supertable_oid),
supertable_constraints as (select constraint_name, constraint_type, supertable_schema, supertable, constraint_col, pc.nspname as subtable_schema, c.relname as subtable_name
from constr_with_names inner join pg_inherits pi on pi.inhparent=constr_with_names.supertable_oid
inner join pg_class c on pi.inhrelid=c.oid
inner join pg_namespace pc on c.relnamespace=pc.oid)
SELECT constraint_name, constraint_type, supertable_schema, supertable, constraint_col, subtable_schema, subtable_name
FROM supertable_constraints as sc
WHERE NOT EXISTS (SELECT 1
FROM constr_with_names AS cn
WHERE sc.subtable_schema=cn.supertable_schema 
AND sc.subtable_name=cn.supertable
AND sc.constraint_type=cn.constraint_type
AND sc.constraint_col=cn.constraint_col)

AND NOT EXISTS (SELECT *
FROM one_value AS o
WHERE o.table_schema=sc.subtable_schema
AND o.table_name=sc.subtable_name
AND array[o.column_name] <@ sc.constraint_col
AND array[o.column_name] @> sc.constraint_col)

order by supertable_schema, supertable, constraint_name, subtable_schema, subtable_name, constraint_col;