[datatable-help] Syntax: ag["M",age]$age ?

[Dieter Menne]

The reason the grouping columns are always returned 
was for consistency when there are multiple groups in i you probably want 
to know which refer to which and we don't want a different type to be 
returned depending on data passed to i. 



I saw that point too. Better leave it that way for compatibility, I just was
not sure if I got the logic right.

 

Dieter

 



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