DatumGetSpanP DatumGetSpanSetP dist_double_value_value ensure_same_span_type ensure_span_isof_basetype ensure_span_isof_type ensure_valid_span_span floatspan_floor_ceil_iter mi_span_span mi_span_value numspan_delta_scale_iter numspan_shift_scale_iter 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_shift_scale_time span_bounds_shift_scale_value span_decr_bound span_deserialize span_incr_bound span_lower_cmp span_upper_cmp spanarr_normalize SpanPGetDatum SpanSetPGetDatum tstzspan_delta_scale_iter tstzspan_shift_scale1

dist_double_value_value() double dist_double_value_value ( Datum  l, Datum  r, meosType  type  ) Return the distance between two values as a double for the indexes. Parameters [in] l,r Values [in] type Type of the values Returns On error return -1