diff --git a/source/dnode/vnode/src/tsdb/tsdbCache.c b/source/dnode/vnode/src/tsdb/tsdbCache.c
index aa5058a1a2..a964a46406 100644
--- a/source/dnode/vnode/src/tsdb/tsdbCache.c
+++ b/source/dnode/vnode/src/tsdb/tsdbCache.c
@@ -1093,72 +1093,71 @@ _err:
 // iterate next row non deleted backward ts, version (from high to low)
 static int32_t nextRowIterGet(CacheNextRowIter *pIter, TSDBROW **ppRow) {
   int code = 0;
+  for (;;) {
+    for (int i = 0; i < 4; ++i) {
+      if (pIter->input[i].next && !pIter->input[i].stop) {
+        code = pIter->input[i].nextRowFn(pIter->input[i].iter, &pIter->input[i].pRow);
+        if (code) goto _err;
 
-  for (int i = 0; i < 4; ++i) {
-    if (pIter->input[i].next && !pIter->input[i].stop) {
-      code = pIter->input[i].nextRowFn(pIter->input[i].iter, &pIter->input[i].pRow);
-      if (code) goto _err;
-
-      if (pIter->input[i].pRow == NULL) {
-        pIter->input[i].stop = true;
-        pIter->input[i].next = false;
-      }
-    }
-  }
-
-  if (pIter->input[0].stop && pIter->input[1].stop && pIter->input[2].stop && pIter->input[3].stop) {
-    *ppRow = NULL;
-    return code;
-  }
-
-  // select maxpoint(s) from mem, imem, fs and last
-  TSDBROW *max[4] = {0};
-  int      iMax[4] = {-1, -1, -1, -1};
-  int      nMax = 0;
-  TSKEY    maxKey = TSKEY_MIN;
-
-  for (int i = 0; i < 4; ++i) {
-    if (!pIter->input[i].stop && pIter->input[i].pRow != NULL) {
-      TSDBKEY key = TSDBROW_KEY(pIter->input[i].pRow);
-
-      // merging & deduplicating on client side
-      if (maxKey <= key.ts) {
-        if (maxKey < key.ts) {
-          nMax = 0;
-          maxKey = key.ts;
+        if (pIter->input[i].pRow == NULL) {
+          pIter->input[i].stop = true;
+          pIter->input[i].next = false;
         }
-
-        iMax[nMax] = i;
-        max[nMax++] = pIter->input[i].pRow;
       }
     }
-  }
 
-  // delete detection
-  TSDBROW *merge[4] = {0};
-  int      iMerge[4] = {-1, -1, -1, -1};
-  int      nMerge = 0;
-  for (int i = 0; i < nMax; ++i) {
-    TSDBKEY maxKey1 = TSDBROW_KEY(max[i]);
-
-    bool deleted = tsdbKeyDeleted(&maxKey1, pIter->pSkyline, &pIter->iSkyline);
-    if (!deleted) {
-      iMerge[nMerge] = iMax[i];
-      merge[nMerge++] = max[i];
+    if (pIter->input[0].stop && pIter->input[1].stop && pIter->input[2].stop && pIter->input[3].stop) {
+      *ppRow = NULL;
+      return code;
     }
 
-    pIter->input[iMax[i]].next = deleted;
+    // select maxpoint(s) from mem, imem, fs and last
+    TSDBROW *max[4] = {0};
+    int      iMax[4] = {-1, -1, -1, -1};
+    int      nMax = 0;
+    TSKEY    maxKey = TSKEY_MIN;
+
+    for (int i = 0; i < 4; ++i) {
+      if (!pIter->input[i].stop && pIter->input[i].pRow != NULL) {
+        TSDBKEY key = TSDBROW_KEY(pIter->input[i].pRow);
+
+        // merging & deduplicating on client side
+        if (maxKey <= key.ts) {
+          if (maxKey < key.ts) {
+            nMax = 0;
+            maxKey = key.ts;
+          }
+
+          iMax[nMax] = i;
+          max[nMax++] = pIter->input[i].pRow;
+        }
+      }
+    }
+
+    // delete detection
+    TSDBROW *merge[4] = {0};
+    int      iMerge[4] = {-1, -1, -1, -1};
+    int      nMerge = 0;
+    for (int i = 0; i < nMax; ++i) {
+      TSDBKEY maxKey1 = TSDBROW_KEY(max[i]);
+
+      bool deleted = tsdbKeyDeleted(&maxKey1, pIter->pSkyline, &pIter->iSkyline);
+      if (!deleted) {
+        iMerge[nMerge] = iMax[i];
+        merge[nMerge++] = max[i];
+      }
+
+      pIter->input[iMax[i]].next = deleted;
+    }
+
+    if (nMerge > 0) {
+      pIter->input[iMerge[0]].next = true;
+
+      *ppRow = merge[0];
+      return code;
+    }
   }
 
-  if (nMerge > 0) {
-    pIter->input[iMerge[0]].next = true;
-
-    *ppRow = merge[0];
-  } else {
-    *ppRow = NULL;
-  }
-
-  return code;
 _err:
   return code;
 }