presto-phoenix/src/main/java/io/prestosql/plugin/phoenix/PhoenixTableProperties.java/PhoenixTableProperties/getSaltBuckets
class PhoenixTableProperties:    public static Optional<Integer> getSaltBuckets(Map<String, Object> tableProperties)
    {
        requireNonNull(tableProperties);

        Integer value = (Integer) tableProperties.get(SALT_BUCKETS);
        if (value == null) {
            return Optional.empty();
        }

        return Optional.of(value);
    }