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Teach CLUSTER to use seqscan-and-sort when it's faster than indexscan.

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... or at least, when the planner's cost estimates say it will be faster.

Leonardo Francalanci, reviewed by Itagaki Takahiro and Tom Lane
This commit is contained in:
Tom Lane
2010-10-07 20:00:28 -04:00
parent 694c56af2b
commit 3ba11d3df2
14 changed files with 716 additions and 141 deletions
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src/include/optimizer/cost.h
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@@ -84,6 +84,7 @@ extern void cost_ctescan(Path *path, PlannerInfo *root, RelOptInfo *baserel);
extern void cost_recursive_union(Plan *runion, Plan *nrterm, Plan *rterm);
extern void cost_sort(Path *path, PlannerInfo *root,
List *pathkeys, Cost input_cost, double tuples, int width,
Cost comparison_cost, int sort_mem,
double limit_tuples);
extern void cost_material(Path *path,
Cost input_startup_cost, Cost input_total_cost,