Remove hashtable index from memtable#341
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Use btree as the sole index in ObQueryEngine. Add insert_or_get() to ObKeyBtree for atomic insert-or-get semantics. Fold hashtable-based create_kv/ensure_kv into btree-only path. Point lookups now go directly through ObQueryEngine::get() (btree lookup).
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Use btree as the sole index in ObQueryEngine. Add insert_or_get() to ObKeyBtree for atomic insert-or-get semantics. Fold hashtable-based create_kv/ensure_kv into btree-only path. Point lookups now go directly through ObQueryEngine::get() (btree lookup).
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