@@ -1983,7 +1983,6 @@ compute_cpu_sort_cost(PlannerInfo *root, List *pathkeys, int nPresortedKeys,
19831983double totalFuncCost = 1.0 ;
19841984bool has_fake_var = false;
19851985int i = 0 ;
1986- Oid prev_datatype = InvalidOid ;
19871986List * cache_varinfos = NIL ;
19881987
19891988/* fallback if pathkeys is unknown */
@@ -2011,50 +2010,17 @@ compute_cpu_sort_cost(PlannerInfo *root, List *pathkeys, int nPresortedKeys,
20112010 */
20122011foreach (lc ,pathkeys )
20132012{
2014- PathKey * pathkey = (PathKey * )lfirst (lc );
2015- EquivalenceMember * em ;
2016- double nGroups ,
2017- correctedNGroups ;
2018- Cost funcCost = 1.0 ;
2013+ PathKey * pathkey = (PathKey * )lfirst (lc );
2014+ EquivalenceMember * em ;
2015+ double nGroups ,
2016+ correctedNGroups ;
20192017
20202018/*
20212019 * We believe that equivalence members aren't very different, so, to
20222020 * estimate cost we consider just the first member.
20232021 */
20242022em = (EquivalenceMember * )linitial (pathkey -> pk_eclass -> ec_members );
20252023
2026- if (em -> em_datatype != InvalidOid )
2027- {
2028- /* do not lookup funcCost if the data type is the same */
2029- if (prev_datatype != em -> em_datatype )
2030- {
2031- Oid sortop ;
2032- QualCost cost ;
2033-
2034- sortop = get_opfamily_member (pathkey -> pk_opfamily ,
2035- em -> em_datatype ,em -> em_datatype ,
2036- pathkey -> pk_strategy );
2037-
2038- cost .startup = 0 ;
2039- cost .per_tuple = 0 ;
2040- add_function_cost (root ,get_opcode (sortop ),NULL ,& cost );
2041-
2042- /*
2043- * add_function_cost returns the product of cpu_operator_cost
2044- * and procost, but we need just procost, co undo that.
2045- */
2046- funcCost = cost .per_tuple /cpu_operator_cost ;
2047-
2048- prev_datatype = em -> em_datatype ;
2049- }
2050- }
2051-
2052- /* factor in the width of the values in this column */
2053- funcCost *=get_width_cost_multiplier (root ,em -> em_expr );
2054-
2055- /* now we have per-key cost, so add to the running total */
2056- totalFuncCost += funcCost ;
2057-
20582024/* remember if we have found a fake Var in pathkeys */
20592025has_fake_var |=is_fake_var (em -> em_expr );
20602026pathkeyExprs = lappend (pathkeyExprs ,em -> em_expr );