Postgres - how Redash list granted tables


Hi, I recently installed Redash 3 to connect with our Postgres. When tested using my Postgres admin user, the query window can list all available tables. Then I create a specific role for Redash, (e.g ‘redash’) with only granted select and execution on objects in public schema. When I open the query window again (this time using ‘redash’ to connect to Postgres) the table list is gone. I thought something not right with my config at first, but then I noticed that I can get the list back when switched again my datasource connection to admin user for Postgres.
I want to know how Redash listing Postgres objects, since I don’t want to grant entire pg_catalogs content to this 'redash ’ role.


Two queries are executed
Link to code

def _get_tables(self, schema):
    query = """
    SELECT table_schema, table_name, column_name
    FROM information_schema.columns
    WHERE table_schema NOT IN ('pg_catalog', 'information_schema');

    self._get_definitions(schema, query)

    materialized_views_query = """
    SELECT ns.nspname as table_schema,
           mv.relname as table_name,
           atr.attname as column_name
    FROM pg_class mv
      JOIN pg_namespace ns ON mv.relnamespace = ns.oid
      JOIN pg_attribute atr
        ON atr.attrelid = mv.oid
       AND atr.attnum > 0
       AND NOT atr.attisdropped
    WHERE mv.relkind = 'm';

    self._get_definitions(schema, materialized_views_query)

    return schema.values()