bptree does not work well for auto-increasing keys

weed/util/bptree/getter_setter.go

@@ -1,5 +1,13 @@
 package bptree
 
+var (
+	protoNodeId = int64(0)
+)
+func GetProtoNodeId() int64 {
+	protoNodeId++
+	return protoNodeId
+}
+
 func (self *BpMap) getRoot() *BpNode {
 	return self.root
 }
@@ -26,3 +34,39 @@ func (self *BpNode) getPrev() *BpNode {
 func (self *BpNode) setPrev(prev *BpNode) {
 	self.prev = prev
 }
+func (self *BpNode) getNode(x int)(*BpNode) {
+	return self.pointers[x]
+}
+
+func (self *BpNode) maybePersist(shouldPersist bool) error {
+	if !shouldPersist {
+		return nil
+	}
+	return self.persist()
+}
+func (self *BpNode) persist() error {
+	if PersistFn != nil {
+		return PersistFn(self)
+	}
+	return nil
+}
+func (self *BpNode) destroy() error {
+	if DestroyFn != nil {
+		return DestroyFn(self)
+	}
+	return nil
+}
+
+func persist(a, b *BpNode) error {
+	if a != nil {
+		if err := a.persist(); err != nil {
+			return err
+		}
+	}
+	if b != nil {
+		if err := b.persist(); err != nil {
+			return err
+		}
+	}
+	return nil
+}