WITH columns_with_domains_chk AS (
SELECT cdu.table_schema, cdu.table_name, 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
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') 
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)),

text_columns_with_domains_chk AS (
SELECT table_schema, table_name, column_name, data_type, check_clause
FROM columns_with_domains_chk
WHERE data_type LIKE '%char%' OR data_type = 'text'),

text_simple_chk AS (SELECT 
(SELECT nspname FROM pg_namespace WHERE oid=c.relnamespace) AS table_schema,
c.relname as table_name, 
a.attname AS column_name,
t.typname AS type_name,
pg_get_constraintdef(o.oid) 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
INNER JOIN pg_type t ON a.atttypid=t.oid
WHERE cardinality(o.conkey)=1 
AND o.contype = 'c' 
AND t.typname IN ('bpchar','char','varchar', 'text')
UNION SELECT table_schema, table_name, column_name, data_type, check_clause
FROM text_columns_with_domains_chk),

text_empty_chk AS (SELECT table_schema, table_name, column_name, type_name
FROM text_simple_chk
WHERE check_clause~'!~.*(\\s|\[\[:space:\]\])'),

text_pattern_space_chk AS (SELECT table_schema, table_name, column_name, type_name
FROM text_simple_chk
WHERE check_clause~'[[:space:]](~[*]{0,1}|~|~~[*]{0,1})[[:space:]].*''[\^]{0,1}[^''\^]*(:space:|\\s| )[^'']*'''),

text_pattern_chk AS (SELECT table_schema, table_name, column_name, type_name
FROM text_simple_chk
WHERE check_clause~'[[:space:]](~[*]{0,1}|~|~~[*]{0,1})[[:space:]]'),

text_columns AS (SELECT table_schema, table_name, table_type, column_name, data_type, character_maximum_length, is_nullable, ordinal_position
FROM INFORMATION_SCHEMA.columns INNER JOIN INFORMATION_SCHEMA.tables USING (table_schema, table_name)
WHERE (data_type LIKE '%char%' OR data_type = 'text') 
AND table_type IN ('BASE TABLE') AND 
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)),

fk_columns AS (select target_schema as table_schema, target_table as table_name, a.attname as column_name
from (select 
(select nspname from pg_namespace where oid=c.relnamespace) as target_schema,
c.relname as target_table, 
c.oid as target_table_oid,
unnest(o.conkey) AS target_col
from pg_constraint o inner join pg_class c on c.oid = o.conrelid
where o.contype = 'f') t
inner join pg_attribute a on t.target_col = a.attnum and t.target_table_oid = a.attrelid and a.attisdropped = false)

SELECT  table_schema, table_name, column_name, data_type, character_maximum_length, is_nullable, (SELECT string_agg(check_clause,',<br>') AS checks
FROM text_simple_chk AS tsc WHERE tc.table_schema=tsc.table_schema AND tsc.table_name=tc.table_name AND tsc.column_name=tc.column_name) AS checks
FROM text_columns AS tc
WHERE NOT EXISTS (SELECT 1 FROM fk_columns AS f WHERE tc.table_schema=f.table_schema AND tc.table_name=f.table_name
AND tc.column_name=f.column_name)
AND NOT EXISTS (SELECT 1 FROM text_empty_chk AS tec WHERE tc.table_schema=tec.table_schema AND tc.table_name=tec.table_name
AND tc.column_name=tec.column_name)
AND (EXISTS (SELECT 1 FROM text_pattern_space_chk AS tpsc WHERE tc.table_schema=tpsc.table_schema AND tc.table_name=tpsc.table_name
AND tc.column_name=tpsc.column_name)
OR NOT EXISTS (SELECT 1 FROM text_pattern_chk AS tpc WHERE tc.table_schema=tpc.table_schema AND tc.table_name=tpc.table_name
AND tc.column_name=tpc.column_name))

ORDER BY table_schema, table_name, ordinal_position;