presto-accumulo/src/main/java/io/prestosql/plugin/accumulo/index/IndexLookup.java/IndexLookup/getIndexedConstraintRanges
class IndexLookup:    private static Multimap<AccumuloColumnConstraint, Range> getIndexedConstraintRanges(Collection<AccumuloColumnConstraint> constraints, AccumuloRowSerializer serializer)
    {
        ImmutableListMultimap.Builder<AccumuloColumnConstraint, Range> builder = ImmutableListMultimap.builder();
        for (AccumuloColumnConstraint columnConstraint : constraints) {
            if (columnConstraint.isIndexed()) {
                for (Range range : getRangesFromDomain(columnConstraint.getDomain(), serializer)) {
                    builder.put(columnConstraint, range);
                }
            }
            else {
                LOG.warn("Query contains constraint on non-indexed column %s. Is it worth indexing?", columnConstraint.getName());
            }
        }
        return builder.build();
    }