I marked this as "ready for commiter" and tried to add me as the *second* author. But the CF app forces certain msyterious order for listed names. Is there any means to arrange the author names in desired order?
At Fri, 26 Feb 2016 16:06:37 +0900 (Tokyo Standard Time), Kyotaro HORIGUCHI <horiguchi.kyot...@lab.ntt.co.jp> wrote in <20160226.160637.65689630.horiguchi.kyot...@lab.ntt.co.jp> > Hello, This is a (maybe) committer-ready patch of a Tomas > Vondra's project. > > This patch applies on the current master and passes make check. > > This is to exclude some base-estrict clauses that are implied by > index predicates on index scans on partial indexes. > > First, this patch adds a new member indexrinfos to IndexOptInfo, > which usually has the same value with baserestrictinfo of the > parent RelOptInfo and cost_index() uses this instead of > RelOptInfo.baserestrictinfo. > > For partial indexes, the clauses implied by the index predicates > are removed from the indexrinfos, so that the result plan for > scans on such indexes won't contain such restrictions. Such > restrictions commonly become filter quals that are nothing but a > useless work to do, so this will improve the performance of some > index scans on partial indexes. > > The largest part of the extra cost of the additional work would > be the cost of predicate_implied_by() on all clauses of > baserectrictinfo and indpred of every IndexOptInfos. The extra > work is done in check_partial_indexes() for all index scans on > partial indexes. -- Kyotaro Horiguchi NTT Open Source Software Center -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers