On Tue, Oct 10, 2017 at 7:29 PM, Gourav Kumar <gourav1...@gmail.com> wrote: > Hi all, > > When you fire a query in postgresql, it will first parse the query and > create the data structures for storing various aspects of the query and > executing the query. (Like RangeTblEntry, PlannerInfo, RangeOptInfo etc.). > > I want to know how does postgresql stores the join predicates of a query. > Like which data structure is used to store the join predicates. > > How can we find the join predicates applied on a relation from relid, Oid or > RangeTblEntry ? >
Every relation has a RelOptInfo associated with it. Predicates applicable to it are stored in this RelOptInfo as a list. For base relations (simple tables) it's in baserestrictinfo. The join predicates applicable are in joininfo. You can get RelOptInfo of a given simple table using find_base_rel(). HTH. -- Best Wishes, Ashutosh Bapat EnterpriseDB Corporation The Postgres Database Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
