Simon Riggs wrote:
>
> On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
> > Simon Riggs <[EMAIL PROTECTED]> writes:
> > > We can check for removal of a rel by...
>
> OT comment: I just found a blog about Oracle's optimizermagic, which is
> quite interesting. I notice there is a blog there about
On Thu, 2008-08-14 at 09:27 -0400, Robert Haas wrote:
> I'm guessing it's this... looks pretty interesting even if not.
>
> http://optimizermagic.blogspot.com/2008/06/why-are-some-of-tables-in-my-query.html
Yes, thanks for copying it in.
--
Simon Riggs www.2ndQuadrant.com
PostgreSQ
I'm guessing it's this... looks pretty interesting even if not.
http://optimizermagic.blogspot.com/2008/06/why-are-some-of-tables-in-my-query.html
...Robert
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"Simon Riggs" <[EMAIL PROTECTED]> writes:
> On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
>> Simon Riggs <[EMAIL PROTECTED]> writes:
>> > We can check for removal of a rel by...
>
> OT comment: I just found a blog about Oracle's optimizermagic, which is
> quite interesting. I notice there is
On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
> Simon Riggs <[EMAIL PROTECTED]> writes:
> > We can check for removal of a rel by...
OT comment: I just found a blog about Oracle's optimizermagic, which is
quite interesting. I notice there is a blog there about join removal,
posted about 12 ho
On Fri, 2008-06-27 at 17:50 -0400, Tom Lane wrote:
> Simon Riggs <[EMAIL PROTECTED]> writes:
> > On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
> >> It might be possible to treat "ignore the RHS" as a join strategy and
> >> try to apply it while forming join relations, which would be late enou
Simon Riggs <[EMAIL PROTECTED]> writes:
> On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
>> It might be possible to treat "ignore the RHS" as a join strategy and
>> try to apply it while forming join relations, which would be late enough
>> to have all the needed info available.
> Oh, actually
On Thu, 2008-06-26 at 13:42 -0400, Tom Lane wrote:
> Simon Riggs <[EMAIL PROTECTED]> writes:
> > We can check for removal of a rel by
>
> > 1. inspecting the target list for the query to see if there are rels
> > that do not provide any attributes. (We might also use equivalence
> > classes to re
Simon Riggs <[EMAIL PROTECTED]> writes:
> We can check for removal of a rel by
> 1. inspecting the target list for the query to see if there are rels
> that do not provide any attributes. (We might also use equivalence
> classes to recode the targetlist to minimise the numbers of tables
> touched,
There are common cases where we want to remove unwanted joins from
queries, especially with view and Object Relational Mapping systems such
as Hibernate etc.. (I've mentioned this before on -hackers or -perform,
but I can't find the links)
Typical case is where we have a class that has a subclass
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