On Tue, Jul 25, 2006 at 06:49:02PM -0400, Tom Lane wrote: > What if we dropped the array convention, and simply passed the tidbitmap > object to the index AM's getmulti function, with the instructions "stuff > all the TIDs into this bitmap, and don't come back till you're done"? > For the existing index AMs this'd be only trivially different, but it > should result in some fractional savings of call overhead when scanning > a large number of index entries.
Well, my only thoughtis that this pretty means you can't use index_getmulti for anything else. For example, when I was playing with async i/o I was using index_getmulti to get a list of TIDs, submitting all the read requests in parallel and then waiting on them. What you lose by storing straight into bitmaps is the *order*. Mind you, index_getmulti never supported backward scans either so its not a great loss but just thought I'd throw it in the rink. Have a nice day, -- Martijn van Oosterhout <kleptog@svana.org> http://svana.org/kleptog/ > From each according to his ability. To each according to his ability to > litigate.
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