It seems like -append- ought to be smart enough to at least give a warning
if you try to append a dataset with NO variables in common with the master
dataset. I just run into this helping a colleague who has a dozen Census
extract files, produced elsewhere and probably used by a number of
researchers. He was appending them in a -for- loop. _One_ of those files,
it turns out, has UPPER CASE FILENAMES. The rest have all the same
variables with lower case filenames. Yes, once you figure that out,
"renvars _all, lower" (STB) does a very nice job of cleaning up this mess,
but the outcome of appending 85 variables, none of which are in common with
the 85 variables in memory, is to double the memory requirements---so you
get a r(901), and eonder why that should possibly be happening when the
size of the data is not increasing by that much.
Might -append- reasonably give you a warning that appending without any
common contents between the master and using datasets is surely likely to
be a logical error?
