LEAF_NODE

FileBPlusTree

LEAF_VALUES

FileBPlusTree

LeafNode

MemoryBPlusTree

last

BPlusTree FileBPlusTree MemoryBPlusTree

lastlen

BPlusTree FileBPlusTree MemoryBPlusTree

leftmost

BPlusTree

length

Node

load

BPlusTree

lookup

BPlusTree

lookupGTE

BPlusTree