On Mon, Jun 26, 2006 at 07:17:31AM -0400, Bruce Momjian wrote: > Correct! We use the same pointers used by normal UPDATEs, except we set > a bit on the old tuple indicating it is a single-index tuple, and we > don't create index entries for the new tuple. Index scan routines will > need to be taught about the new chains, but because only one tuple in > the chain is visible to a single backend, the callers should not need to > be modified.
I suppose we would also change the index_getmulti() function to return a set of ctids plus flags so the caller knows to follow the chains, right? And for bitmap index scans you would only remember the page in the case of such a tuple, since you can't be sure the exact ctid you've got is the one you want. Seems doable. 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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