encode method
Implementation
void encode(ByteData bd, {int offset = 0}) {
bd.setUint64(offset, xmin, Endian.little);
bd.setUint64(offset + 8, xmax, Endian.little);
bd.setUint64(offset + 16, rowId, Endian.little);
bd.setUint16(offset + 24, mvccFlags, Endian.little);
}