WITH table_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 data_type,
a.atttypmod-4 AS character_maximum_length,
o.conname,
substring(pg_get_constraintdef(o.oid),7) AS consrc
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 o.conrelid in (SELECT oid FROM pg_class c WHERE c.relkind = 'r')
AND t.typname in ('bpchar','char','varchar'))
SELECT format ('ALTER TABLE %1$I.%2$I DROP CONSTRAINT %3$I;', table_schema, table_name, conname) AS statements
FROM table_simple_chk
WHERE consrc LIKE '% <= ' || character_maximum_length || ')%' 
OR consrc LIKE '%(' || character_maximum_length || ' >= %'
OR consrc LIKE  '%~%,' || character_maximum_length || '}%'
OR consrc LIKE  '%,' || character_maximum_length || '}%~%'
ORDER BY table_schema, table_name ;

WITH domains AS (
SELECT (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,
(SELECT character_maximum_length FROM INFORMATION_SCHEMA.domains AS d
WHERE d.domain_schema=dc.domain_schema AND d.domain_name=dc.domain_name) AS character_maximum_length,
cc.check_clause,
cdu.domain_schema, cdu.domain_name, dc.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_catalog, constraint_schema, constraint_name)
WHERE t.table_type='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 catalog_name IS NOT NULL AND schema_name IS NOT NULL)),

text_domains AS (
SELECT domain_schema, domain_name, constraint_name, check_clause, character_maximum_length
FROM domains
WHERE data_type LIKE '%char%')

SELECT  format('ALTER DOMAIN %1$I.%2$I DROP CONSTRAINT %3$I;', domain_schema, domain_name, constraint_name) AS statements
FROM text_domains
WHERE check_clause LIKE '% <= ' || character_maximum_length || ')%' 
OR check_clause LIKE '%(' || character_maximum_length || ' >= %'
OR check_clause LIKE  '%~%,' || character_maximum_length || '}%'
OR check_clause LIKE  '%,' || character_maximum_length || '}%~%'
ORDER BY domain_schema, domain_name;