Function numeric_accum

src/backend/utils/adt/numeric.c:4829–4844

* Generic transition function for numeric aggregates that require sumX2. */

 * Generic transition function for numeric aggregates that require sumX2.
 */
Datum
numeric_accum(PG_FUNCTION_ARGS)
{
	NumericAggState *state;

	state = PG_ARGISNULL(0) ? NULL : (NumericAggState *) PG_GETARG_POINTER(0);

	/* Create the state data on the first call */
	if (state == NULL)
		state = makeNumericAggState(fcinfo, true);

	if (!PG_ARGISNULL(1))
		do_numeric_accum(state, PG_GETARG_NUMERIC(1));

	PG_RETURN_POINTER(state);
}

/*
 * Generic combine function for numeric aggregates which require sumX2