presto-parser/src/main/java/io/prestosql/sql/SqlFormatter.java/Formatter/visitShowRoleGrants
class Formatter:        @Override
        protected Void visitShowRoleGrants(ShowRoleGrants node, Integer context)
        {
            builder.append("SHOW ROLE GRANTS");

            if (node.getCatalog().isPresent()) {
                builder.append(" FROM ")
                        .append(node.getCatalog().get());
            }

            return null;
        }