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## Problem See https://github.com/neondatabase/neon/issues/12018 Now `prefetch_register_bufferv` calculates min_ring_index of all vector requests. But because of pump prefetch state or connection failure, previous slots can be already proceeded and reused. ## Summary of changes Instead of returning minimal index, this function should return last slot index. Actually result of this function is used only in two places. A first place just fort checking (and this check is redundant because the same check is done in `prefetch_register_bufferv` itself. And in the second place where index of filled slot is actually used, there is just one request. Sp fortunately this bug can cause only assert failure in debug build. --------- Co-authored-by: Konstantin Knizhnik <knizhnik@neon.tech>