Function AR_DISTINCT

src/arithmetic/conditional_funcs/conditional_funcs.c:81–85

Distinct maintains a set of values, if value `X` already in the set return NULL, otherwise `X` is returned and added to to the set.

// if value `X` already in the set return NULL,
// otherwise `X` is returned and added to to the set.
SIValue AR_DISTINCT(SIValue *argv, int argc, void *private_data) {
	set *set = private_data;
	if(Set_Add(set, argv[0])) return SI_TransferOwnership(argv);
	return SI_NullVal();
}

// Routine for freeing a Distinct function context.
void Distinct_Free(void *ctx_ptr) {