Also, calc_hist_selectivity_contains in multirangetypes_selfuncs.c needs a proper comment, not just "this is a copy from rangetypes".
However, it seems the two functions are exactly the same. Would the functions diverge in the future? If not, maybe there should be just a single shared function? regards -- Tomas Vondra EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company
