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| author | Bruce Momjian <bruce@momjian.us> | 1999-02-08 04:29:25 +0000 |
|---|---|---|
| committer | Bruce Momjian <bruce@momjian.us> | 1999-02-08 04:29:25 +0000 |
| commit | 54e5d256664ece2cb180f4d5a278397906fe5988 (patch) | |
| tree | fda8b8114eb76c34c2d5080ac4363cbaad9ac86e /src/backend/optimizer/README | |
| parent | 07c33ba79e9daf5dfbfc3773b2dbf2a7f270d727 (diff) | |
| download | postgresql-54e5d256664ece2cb180f4d5a278397906fe5988.tar.gz | |
Optimizer cleanup.
Diffstat (limited to 'src/backend/optimizer/README')
| -rw-r--r-- | src/backend/optimizer/README | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/src/backend/optimizer/README b/src/backend/optimizer/README index 6d9dae115c..18b534191e 100644 --- a/src/backend/optimizer/README +++ b/src/backend/optimizer/README @@ -1,3 +1,11 @@ +The optimizer generates optimial query plans by doing several steps: + +Take each relation in a query, and make a RelOptInfo structure for it. +Find each way of accessing the relation, called a Path, including +sequential and index scans, and add it to the RelOptInfo.path_order +list. + + Optimizer Functions ------------------- |