Re: [HACKERS] Turn off transitive joins
I don't think there is any need to add any such capability in postgresql, but I need it for my work. I need the join qualifiers. On 15-Oct-2017 1:37 AM, "Tom Lane" wrote: > Gourav Kumar writes: > > Is there some way by which I can tell postgresql to not to consider > > transitive joins while considering join pairs. > > No ... and you have presented no reason whatever why we should consider > adding such a capability. > > Maybe you should be trying to construct your join graph someplace > earlier, before the optimizer processes the join quals. > > regards, tom lane >
Re: [HACKERS] Turn off transitive joins
Gourav Kumar writes: > Is there some way by which I can tell postgresql to not to consider > transitive joins while considering join pairs. No ... and you have presented no reason whatever why we should consider adding such a capability. Maybe you should be trying to construct your join graph someplace earlier, before the optimizer processes the join quals. regards, tom lane -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
[HACKERS] Turn off transitive joins
Hi all, Is there some way by which I can tell postgresql to not to consider transitive joins while considering join pairs. I.e. Let's say a query has two join predicates one between A & B relations and the other between B and C relations. While constructing the DP to find the best join order, the Optimizer also consider join between A & C, which can be thought of as a transitive join. Is their some way to turn this off or tell postgresql to not to consider these type of joins ?
