@Override
    public void getRaw(int colId, BytePiece bytes) {
        int offset = colId == 0 ? 0 : sums[colId - 1];
        int to = sums[colId];
        bytes.base = data.array();
        bytes.addr = BYTE_ARRAY_OFFSET + offset;
        bytes.len = to - offset;
    }
A simple row can only store simple values like int, double, string. But cannot store multi-value column.
indexr-segment/src/main/java/io/indexr/segment/helper/SimpleRow.java