On Thu, May 10, 2018 at 8:57 AM, Alvaro Herrera <alvhe...@2ndquadrant.com> wrote:
> b) by default, no partitions are > scanned, and we examine the query to determine which ones must be > scanned. > There is an element of logic that says "by default, no partitions are scanned" is not a reasonable behavior mode. Thus an alternative analogy would be: Bucket A is the set of all relevant partitions in the tree Pruning: remove from bucket A those which we know we can skip; then iterate over A Selection: choose those items from A that are possible holders of our data and process each one (place all selected items into bucket B and iterate over B if you want to perform selection in total first). As a user I don't really need to know which model is implemented and the name doesn't necessarily imply the implementation. Pruning seems to be the commonly-used term for this feature and we should stick with that. David J.
