I think is not possible... :-(

The association object pattern describe because....

But for this and other cases i've a proposal:

The add_column function must add only column in the Result, and oly
add_entity must add tables to from clause, in this manner people who
use this feature can do anyway all they want. Otherwise in cases where
generated select contain already the table of my add_column dont add
it again retrievind erroneus records.


Thank you
Glauco


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