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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 6d9dae115c3..18b534191e3 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 ------------------- |