presto-main/src/main/java/io/prestosql/connector/informationschema/InformationSchemaMetadata.java/InformationSchemaMetadata/listSchemaNames
class InformationSchemaMetadata:    private Stream<QualifiedTablePrefix> listSchemaNames(Session session)
    {
        return metadata.listSchemaNames(session, catalogName).stream()
                .map(schema -> new QualifiedTablePrefix(catalogName, schema));
    }