in chaneset 2120 i made a change to the general contract of the in_()
function:

- sending a selectable to an IN no longer creates a "union" out of
multiple
selects; only one selectable to an IN is allowed now (make a union
yourself
if union is needed; explicit better than implicit, dont guess, etc.)

unions automatically blow away the ORDER BY clause since some DBs (i
dont remember which) dont allow ORDER BY in the individual components
of UNION.  so now union is not used here.


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