adjacent_span_span adjacent_span_value bbox_union_span_span contained_span_span contained_value_span contains_span_span contains_span_timestamptz contains_span_value dist_double_value_value distance_span_span distance_span_value distance_value_value inter_span_span intersection_span_span intersection_span_value intersection_value_span left_span_span left_span_value left_value_span lfnadj_span_span mi_span_span mi_span_value minus_span_span minus_span_value minus_value_span ovadj_span_span overlaps_span_span overleft_span_span overleft_span_value overleft_value_span overright_span_span overright_span_value overright_value_span right_span_span right_span_value right_value_span span_max_value span_min_value super_union_span_span union_span_span union_span_value union_value_span

span_min_value() Datum span_min_value ( Datum  l, Datum  r, meosType  type  ) Return the minimum value of two span base values.