rusackas commented on issue #30678:
URL: https://github.com/apache/superset/issues/30678#issuecomment-5039422984

   Found the root cause. It's not Superset's own filtering, it's SQLAlchemy's 
postgres dialect: `get_schema_names` excludes schemas matching `nspname NOT 
LIKE 'pg_%'`, and `_` in SQL LIKE is a single-char wildcard, so it silently 
drops anything starting with `pg` plus one more letter, not just the real `pg_` 
system schemas. An override of `get_schema_names` in `PostgresBaseEngineSpec` 
with a stricter check would fix it.


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