Kouhei Sutou
null+****@clear*****
Sun May 24 00:19:15 JST 2015
Kouhei Sutou 2015-05-24 00:19:15 +0900 (Sun, 24 May 2015) New Revision: ec84d0daa0d9c2a0e2c0988658cfbc4ca79e9db0 https://github.com/pgroonga/pgroonga/commit/ec84d0daa0d9c2a0e2c0988658cfbc4ca79e9db0 Message: Use the default cost estimation again Because the naive implementation doesn't work well for OR search. Modified files: pgroonga.c Modified: pgroonga.c (+13 -3) =================================================================== --- pgroonga.c 2015-05-24 00:09:16 +0900 (3bcce9b) +++ pgroonga.c 2015-05-24 00:19:15 +0900 (0472125) @@ -2553,6 +2553,9 @@ pgroonga_vacuumcleanup(PG_FUNCTION_ARGS) Datum pgroonga_costestimate(PG_FUNCTION_ARGS) { + return gistcostestimate(fcinfo); + +#ifdef NOT_USED PlannerInfo *root = (PlannerInfo *) PG_GETARG_POINTER(0); IndexPath *path = (IndexPath *) PG_GETARG_POINTER(1); double loopCount = PG_GETARG_FLOAT8(2); @@ -2563,9 +2566,15 @@ pgroonga_costestimate(PG_FUNCTION_ARGS) IndexOptInfo *index = path->indexinfo; /* TODO: Use more clever logic. - * We want to use index scan instead of bitmap scan for full text search. - * We want to use the default scan for other operators such as <, - * <= and so on. + * + * We want to use index scan rather than bitmap scan for full text search. + * Because bitmap scan requires bitmap heap scan that is slow for + * large result set. + * + * We want to use bitmap scan rather than index scan for OR search. + * Because we can't use index scan for OR search. + * + * We want to use the default scan for other cases. */ *indexSelectivity = clauselist_selectivity(root, path->indexquals, @@ -2578,6 +2587,7 @@ pgroonga_costestimate(PG_FUNCTION_ARGS) *indexCorrelation = 0.0; PG_RETURN_VOID(); +#endif } /** -------------- next part -------------- HTML����������������������������...ダウンロード
