Re: Proposed Query Planner TODO items

On 5 Jan, Tom Lane wrote:
> Josh Berkus <josh(at)agliodbs(dot)com> writes:
>> 2) DEVELOP BETTER PLANS FOR "OR GROUP" QUERIES
>
>> Summary: Currently, queries with complex "or group" criteria get devolved by
>> the planner into canonical and-or filters resulting in very poor execution on
>> large data sets. We should find better ways of dealing with these queries,
>> for example UNIONing.
>
>> Description: While helping OSDL with their derivative TPC-R benchmark, we ran
>> into a query (#19) which took several hours to complete on PostgreSQL.
>
> I've made some progress on this over the last week or two. Would it be
> possible to retry that benchmark with CVS tip?
>
> regards, tom lane

Sorry it's taking so long. I tried to take a export from CVS today and
the database appears not to be able to connect to the postmaster when I
attempt to create the database. Let me know if getting a trace of
anything will help, if you guys already aren't already aware of the
problem.

Mark