From 3e90bb45a6ce1d74354e32609b4cdecaa6717de0 Mon Sep 17 00:00:00 2001
From: juziia <50221211+juziia@users.noreply.github.com>
Date: Sat, 13 Aug 2022 20:33:33 +0800
Subject: [PATCH] This condition will not hold

method canRedistribute is to determine whether a node will still be greater than or equal to M / 2-1 after removing a Key.  However, the condition for entering the current method is that the number of keys of the node must be less than or equal to M / 2-1,So I don't think this greater than 0 condition is going to hold
---
 src/main/java/ds/bplus/bptree/BPlusTree.java | 17 -----------------
 1 file changed, 17 deletions(-)

diff --git a/src/main/java/ds/bplus/bptree/BPlusTree.java b/src/main/java/ds/bplus/bptree/BPlusTree.java
index 1d36cd2..556f942 100644
--- a/src/main/java/ds/bplus/bptree/BPlusTree.java
+++ b/src/main/java/ds/bplus/bptree/BPlusTree.java
@@ -1563,7 +1563,6 @@ private TreeNode handleLeafNodeRedistributionOrMerging(TreeNode mnode,
 
         int nnum = canRedistribute(nptr);
         int pnum = canRedistribute(pptr);
-        int snum = canRedistribute(splitNode);
         boolean isLeftOfNext = (parentPointerIndex > parentKeyIndex);
         boolean splitNodeIsLeftChild = parentKeyIndex == parentPointerIndex;
 
@@ -1587,22 +1586,6 @@ else if(pnum > 0 && ppar) {
             } else {
                 redistributeNodes(splitNode, pptr, true, parent, parentKeyIndex);
             }
-        } else if(snum > 0) {
-            if(nptr != null) {
-                //System.out.println("\t -- Redistributing next node with elements from split");
-                if(splitNodeIsLeftChild) {
-                    redistributeNodes(nptr, splitNode, true, parent, parentKeyIndex);
-                } else {
-                    redistributeNodes(nptr, splitNode, true, parent, parentKeyIndex+1);
-                }
-            } else {
-                //System.out.println("\t -- Redistributing prev with elements from split");
-                if(splitNodeIsLeftChild) {
-                    redistributeNodes(pptr, splitNode, false, parent, parentKeyIndex-1);
-                } else {
-                    redistributeNodes(pptr, splitNode, false, parent, parentKeyIndex);
-                }
-            }
         }
         // we can't redistribute, try merging with next
         else if(npar) {