span_const_to_span span_joinsel span_joinsel_default span_sel span_sel_default span_sel_hist

span_sel_hist() double span_sel_hist ( VariableStatData *  vardata, const Span *  constval, meosOper  oper, bool  value  ) Calculate span operator selectivity using histograms of span bounds. This estimate is for the portion of values that are not NULL.