MDAM has sparse and dense mode, for string column, is it possible to use dense mode?

[Liu, Ming (Ming)]

Hi,

I know Trafodion can use MDAM to reduce scanned rows. For probe, there are two 
ways: sparse and dense. If the column is INT, dense probe is just +1 operation, 
if the column is VARCHAR or FLOAT, how to do dense probe? Or we should say 
dense probe is only for INT data type?

thanks,
Ming