_mobdb_span_joinsel _mobdb_span_sel calc_length_hist_frac get_len_position length_hist_bsearch span_bound_bsearch span_bound_distance span_const_to_span Span_joinsel span_joinsel span_joinsel_contained span_joinsel_contains span_joinsel_default span_joinsel_hist span_joinsel_hist1 span_joinsel_overlaps span_joinsel_scalar span_position Span_sel span_sel span_sel_contained span_sel_contains span_sel_default span_sel_hist span_sel_hist1 span_sel_overlaps span_sel_scalar time_oper_sel value_oper_sel

span_sel_contained() static double span_sel_contained ( SpanBound *  const_lower, SpanBound *  const_upper, SpanBound *  hist_lower, int  hist_nvalues, Datum *  hist_length, int  hist_length_nvalues  ) static Calculate selectivity of "var <@ const" operator, i.e., estimate the fraction of spans that fall within the constant lower and upper bounds. This uses the histograms of span lower bounds and span lengths, on the assumption that the span lengths are independent of the lower bounds.