New opportunities for statistics collection in Teradata 14.0 - comment by nazygholizadeh

Hi Carrie,  Thanks for the explanation... 
We sometimes have tables with several multicolumn stats having the same number
 of unique values.

In this example:

collect stats column (A,B)     on tableA;
collect stats column (A,B,C)   on tableA;
collect stats column (A,B,C,D) on tableA;

are collected, becasue any of those combinations could be used in a 
join or filter....

All three collections give the same number of unique values.
Even when I increase the MAXVALUELENGTH to the max length of 140, 
I still see the same number of unique values for all 3,,,  
And column C & D do not have constant values..... 
 So that's kind of strange for me...   

should we still collect all 3 sets?