DatumGetSpanP DatumGetSpanSetP PG_GETARG_SPAN_P PG_GETARG_SPANSET_P PG_RETURN_SPAN_P PG_RETURN_SPANSET_P span_bound_cmp span_bound_qsort_cmp span_bounds span_deserialize span_lower_cmp span_serialize span_to_wkb_buf span_to_wkb_size span_upper_cmp spanarr_normalize SpanPGetDatum SpanSetPGetDatum

span_bound_cmp() int span_bound_cmp ( const SpanBound *  b1, const SpanBound *  b2  ) Compare two span boundary points, returning <0, 0, or >0 according to whether the first one is less than, equal to, or greater than the second one. The boundaries can be any combination of upper and lower; so it's useful for a variety of operators. The simple case is when b1 and b2 are both inclusive, in which case the result is just a comparison of the values held in b1 and b2. If a bound is exclusive, then we need to know whether it's a lower bound, in which case we treat the boundary point as "just greater than" the held value; or an upper bound, in which case we treat the boundary point as "just less than" the held value. There is only one case where two boundaries compare equal but are not identical: when both bounds are inclusive and hold the same value, but one is an upper bound and the other a lower bound.