Re: call the same pl/pgsql procedure twice in the same connection

Bruce Momjian wrote:
> Jan Wieck wrote:
> > Bruce Momjian wrote:
> > > Jan Wieck wrote:
> > > > Bruce Momjian wrote:
> > > > >
> > > > > Jan, instead of doing cache invalidation to fix temporary tables, can we
> > > > > disable cached plans for functions that use temporary tables?
> > > >
> > > >     I  was  thinking  of  a different approach. Enhancing the SPI
> > > >     manager to detect if a plan uses  temporary  objects  and  to
> > > >     remember  the  original  querystring  in the SPI_plan. Having
> > > >     callbacks when temp object  beeing  destroyed  into  the  SPI
> > > >     manager,  causing  it to reparse and plan on the next call to
> > > >     SPI_execp() would do it for everything that uses SPI.
> > >
> > > I was merely proposing that preventing caching of functions ueing temp
> > > tables may be easier than trying to invalidation them on temp table
> > > destruction.
> >
> >     It's neat to say "preventing caching of functions using ...",
> >     now tell in detail how you detect that a function "is"  using
> >     a  temp table?  No, I don't mean how "you" can detect it, how
> >     can the PL/pgSQL parser or executor detect it.  And  when  do
> >     you  detect  it?  Remember  that  PL/pgSQL  has  delayed  SPI
> >     preparation?
> >
> >     Second, it doesn't really look smart to me to prevent  saving
> >     of  all  query  plans  just  because  one of them uses a temp
> >     table.
>
> Well, I assume you could spin through the plan at save time and look at
> every relation reference to see if it is a temp table.

Bruce,
   you are really good at making things sound simple by stopping   half way through.
   Your  assumption  is  exactly  my  "detect  if  a  plan  uses   temporary objects". No go on, what exactly are you
doingwith   the information that the plan uses a temp table?
 
   And BTW, since you are the one who invented temp tables,  how   does someone detect a temp table?


Jan

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