◆ INPUT_AGG_TRANS_STATE_ARG

#define INPUT_AGG_TRANS_STATE_ARG	(	fcinfo,
		state
	)

Value:

  do {  \
    MemoryContext ctx = set_aggregation_context(fcinfo); \
    state = PG_ARGISNULL(0) ? NULL : (SkipList *) PG_GETARG_SKIPLIST_P(0);  \
    if (PG_ARGISNULL(1) || PG_ARGISNULL(2))  \
    {  \
      if (state)  \
        PG_RETURN_SKIPLIST_P(state);  \
      else  \
        PG_RETURN_NULL();  \
    }  \
    unset_aggregation_context(ctx); \
  } while (0)

Helper macro to input the current aggregate state.