How to Retrieve Sample Values for All Columns Using SQL Query on Information Schema

SELECT 
    table_catalog,
    table_schema,
    table_name,
    column_name,
    is_nullable,
    data_type,
    (SELECT column_name FROM query_table(table_catalog || '.' || table_schema || '.' || table_name) WHERE column_name IS NOT NULL LIMIT 1) AS sample_value
FROM information_schema.columns