_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_joinsel_hist() static double span_joinsel_hist ( VariableStatData *  vardata1, VariableStatData *  vardata2, meosOper  oper  ) static Calculate span operator selectivity using histograms of span bounds. This estimate is for the portion of values that are not NULL.