@Override
        public RSIndex create(byte dataType, ByteSlice buffer, int packCount) {
            assert ColumnType.isNumber(dataType);
            return new RSIndex_Histogram_V2(buffer, packCount, ColumnType.isFloatPoint(dataType));
        }
Hash + Histogram, each takes 1024 bits.

| hash index0 | histo index0 | hash index1 | histo index1 | ...
|  1024 bits  |  1024 bits   |  1024 bits  |  1024 bits   | ...
indexr-segment/src/main/java/io/indexr/segment/index/RSIndex_Histogram_V2.java