Is it allowable/safe to invoke more than once any sqlite3_result_*() 
function?  In other terms, subsequent invokation of any result function 
will it harmlessly override a previous one?

As in:

init...
// once for all, post null return in anticipation for the various cases 
where
// parameters or arguments would fail to make sense
sqlite3_result_null();

if (dumb case #1) return;
if (dumb case #2) return;
if (dumb case #3) return;
...
if (dumb case #N) return;

// perform requested action on known-valid input

// override null result by some valid result
sqlite3_result_int(...);




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