presto-password-authenticators/src/main/java/io/prestosql/plugin/password/PasswordAuthenticatorPlugin.java/PasswordAuthenticatorPlugin/getPasswordAuthenticatorFactories
class PasswordAuthenticatorPlugin:    @Override
    public Iterable<PasswordAuthenticatorFactory> getPasswordAuthenticatorFactories()
    {
        return ImmutableList.<PasswordAuthenticatorFactory>builder()
                .add(new LdapAuthenticatorFactory())
                .build();
    }