Here is BRIN-compatible version of patch. Now function PageIndexTupleOverwrite consumes tuple size as a parameter, this behavior is coherent with PageAddItem. Also, i had to remove asserstion that item has a storage in the loop that adjusts line pointers. It would be great if someone could check that place (commented Assert(ItemIdHasStorage(ii)); in PageIndexTupleOverwrite). I suspect that there might be a case when linp's should not be adjusted.
Best regards, Andrey Borodin, Octonica & Ural Federal University.
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