core/mvcc: use btree cursor to navigate rows #3829
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The current implementation is simple, we have a pointer called
CursorPosition::Loadedthat points to a rowid and if it's poiting to either btree or mvcc.Moving with
nextwillpeekboth btree and mvcc to ensure we load the correct next value. This draws some inefficiencies for now as we could simply skip one or other in different cases.