diff --git a/source/dnode/vnode/src/tsdb/tsdbMerge.c b/source/dnode/vnode/src/tsdb/tsdbMerge.c
index 34c883296e..42e9c9bc57 100644
--- a/source/dnode/vnode/src/tsdb/tsdbMerge.c
+++ b/source/dnode/vnode/src/tsdb/tsdbMerge.c
@@ -22,6 +22,7 @@ typedef struct {
 } SRowInfo;
 
 typedef struct {
+  SRowInfo   rowInfo;
   SArray    *aBlockL;  // SArray<SBlockL>
   int32_t    iBlockL;
   SBlockData bData;
@@ -32,7 +33,26 @@ typedef struct {
   SRBTree tMerge;
 } SDataMerger;
 
-SRowInfo *tDataMergeNext(SDataMerger *pMerger) {
+static int32_t tRowInfoCmprFn(const void *p1, const void *p2) {
+  SRowInfo *pInfo1 = (SRowInfo *)p1;
+  SRowInfo *pInfo2 = (SRowInfo *)p2;
+
+  if (pInfo1->suid < pInfo2->suid) {
+    return -1;
+  } else if (pInfo1->suid > pInfo2->suid) {
+    return 1;
+  }
+
+  if (pInfo1->uid < pInfo2->uid) {
+    return -1;
+  } else if (pInfo1->uid > pInfo2->uid) {
+    return 1;
+  }
+
+  return tsdbRowCmprFn(&pInfo1->row, &pInfo2->row);
+}
+
+static SRowInfo *tDataMergeNext(SDataMerger *pMerger) {
   SRowInfo *pRowInfo = NULL;
 
   SRBTreeNode *pNode = pMerger->tMerge.minNode;
diff --git a/source/util/src/trbtree.c b/source/util/src/trbtree.c
index 7364c129bb..4b0f286ef3 100644
--- a/source/util/src/trbtree.c
+++ b/source/util/src/trbtree.c
@@ -210,49 +210,6 @@ void tRBTreeDrop(SRBTree *pTree, SRBTreeNode *pNode) {
   }
 
   // drop impl
-  if (pNode->left == NULL) {
-    if (pNode->parent) {
-      if (pNode == pNode->parent->left) {
-        pNode->parent->left = pNode->right;
-      } else {
-        pNode->parent->right = pNode->right;
-      }
-    } else {
-      pTree->rootNode = pNode->right;
-    }
-
-    if (pNode->right) {
-      pNode->right->parent = pNode->parent;
-    }
-  } else if (pNode->right == NULL) {
-    if (pNode->parent) {
-      if (pNode == pNode->parent->left) {
-        pNode->parent->left = pNode->left;
-      } else {
-        pNode->parent->right = pNode->left;
-      }
-    } else {
-      pTree->rootNode = pNode->left;
-    }
-
-    if (pNode->left) {
-      pNode->left->parent = pNode->parent;
-    }
-  } else {
-    // TODO
-    SRBTreeNode *pSuccessorNode = pNode->right;
-    while (pSuccessorNode->left) {
-      pSuccessorNode = pSuccessorNode->left;
-    }
-
-    pSuccessorNode->parent->left = NULL;  // todo: not correct here
-
-    pSuccessorNode->parent = pNode->parent;
-    pSuccessorNode->left = pNode->left;
-    pSuccessorNode->right = pNode->right;
-    pNode->left->parent = pSuccessorNode;
-    pNode->right->parent = pSuccessorNode;
-  }
 
   // fix
   if (pNode->color == BLACK) {