presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/AccumuloClient.java/AccumuloClient/autoGenerateMapping
class AccumuloClient:    private static Map<String, Pair<String, String>> autoGenerateMapping(List<ColumnMetadata> columns, Optional<Map<String, Set<String>>> groups)
    {
        Map<String, Pair<String, String>> mapping = new HashMap<>();
        for (ColumnMetadata column : columns) {
            Optional<String> family = getColumnLocalityGroup(column.getName(), groups);
            mapping.put(column.getName(), Pair.of(family.orElse(column.getName()), column.getName()));
        }
        return mapping;
    }