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35a22ac48a
If the key type is int64_t and the less-comparator is "natural" (i.e. it's literally 'a < b') we may use the SIMD instructions to search for the key on a node. Before doing so, the maybe_key and the searcher should be prepared for that, in particular: 1. maybe_key should set unused keys to the minimal value 2. the searcher for this case should call the gt() helper with primitive types -- int64_t search key and array of int64_t values To tell to B+ code that the key-less pair is such the less-er should define the simplify_key() method converting search keys to int64_t-s. This searcher is selected automatically, if any mismatch happens it silently falls back to default one. Thus also add a static assertion to the row-cache to mitigate this. Signed-off-by: Pavel Emelyanov <xemul@scylladb.com>