mysql have table t(a Int, b Int), 2 records: (1,1) and (2, 2), then in ck count
`select count(1) from ckdb.t ` -- 2, that's ok.
then, mysql  delete (2,2) and ck count
`select count(1) from ckdb.t ` -- still 2, that's not correct .
payload.ignore(extra_data_len - 2);
        number_columns = readLengthEncodedNumber(payload);
        size_t columns_bitmap_size = (number_columns + 7) / 8;
        switch (header.type)
        {
            case UPDATE_ROWS_EVENT_V1:
            case UPDATE_ROWS_EVENT_V2:
                readBitmap(payload, columns_present_bitmap1, columns_bitmap_size);
                readBitmap(payload, columns_present_bitmap2, columns_bitmap_size);
                break;
            default:
                readBitmap(payload, columns_present_bitmap1, columns_bitmap_size);
                break;
        }
        while (payload.available() > CHECKSUM_CRC32_SIGNATURE_LENGTH)
        {
            parseRow(payload, columns_present_bitmap1);
            if (header.type == UPDATE_ROWS_EVENT_V1 || header.type == UPDATE_ROWS_EVENT_V2)
            {
                parseRow(payload, columns_present_bitmap2);
            }
        }
    }
    
    
    
    
    
    
    void RowsEvent::parseRow(ReadBuffer & payload, Bitmap & bitmap)