presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/conf/AccumuloTableProperties.java/AccumuloTableProperties/getScanAuthorizations
class AccumuloTableProperties:    public static Optional<String> getScanAuthorizations(Map<String, Object> tableProperties)
    {
        requireNonNull(tableProperties);

        @SuppressWarnings("unchecked")
        String scanAuths = (String) tableProperties.get(SCAN_AUTHS);
        return Optional.ofNullable(scanAuths);
    }