span_const_to_span span_joinsel span_joinsel_default span_sel span_sel_default span_sel_hist

span_sel_default() float8 span_sel_default ( meosOper  oper ) Functions for selectivity estimation of time types operators. These functions are based on those of the file rangetypes_selfuncs.c. Estimates are based on histograms of lower and upper bounds. Return a default selectivity estimate for given operator, when we don't have statistics or cannot use them for some reason.