@Override
        public PackRSIndex createPack(byte dataType) {
            assert ColumnType.isNumber(dataType);
            return new PackIndex(ColumnType.isFloatPoint(dataType));
        }
Each pack (with 65536 values), we use 128 bytes, i.e. 1024 bits to index.
indexr-segment/src/main/java/io/indexr/segment/index/RSIndex_Histogram.java