diff --git a/include/common/tdatablock.h b/include/common/tdatablock.h
index e1d3b01611..9c5b712db6 100644
--- a/include/common/tdatablock.h
+++ b/include/common/tdatablock.h
@@ -41,6 +41,12 @@ typedef struct SBlockOrderInfo {
     BMCharPos(bm_, r_) |= (1u << (7u - BitPos(r_))); \
   } while (0)
 
+#define colDataSetNull_f_s(c_, r_)                                        \
+  do {                                                                    \
+    colDataSetNull_f((c_)->nullbitmap, r_);                               \
+    memset(((char*)(c_)->pData) + (c_)->info.bytes * (r_), 0, (c_)->info.bytes); \
+  } while (0)
+
 #define colDataClearNull_f(bm_, r_)                             \
   do {                                                          \
     BMCharPos(bm_, r_) &= ((char)(~(1u << (7u - BitPos(r_))))); \
@@ -136,7 +142,7 @@ static FORCE_INLINE void colDataAppendNULL(SColumnInfoData* pColumnInfoData, uin
   if (IS_VAR_DATA_TYPE(pColumnInfoData->info.type)) {
     colDataSetNull_var(pColumnInfoData, currentRow);  // it is a null value of VAR type.
   } else {
-    colDataSetNull_f(pColumnInfoData->nullbitmap, currentRow);
+    colDataSetNull_f_s(pColumnInfoData, currentRow);
   }
 
   pColumnInfoData->hasNull = true;
@@ -151,6 +157,7 @@ static FORCE_INLINE void colDataAppendNNULL(SColumnInfoData* pColumnInfoData, ui
     for (int32_t i = start; i < start + nRows; ++i) {
       colDataSetNull_f(pColumnInfoData->nullbitmap, i);
     }
+    memset(pColumnInfoData->pData + start * pColumnInfoData->info.bytes, 0, pColumnInfoData->info.bytes * nRows);
   }
 
   pColumnInfoData->hasNull = true;
@@ -231,7 +238,6 @@ int32_t blockDataSort_rv(SSDataBlock* pDataBlock, SArray* pOrderInfo, bool nullF
 
 int32_t colInfoDataEnsureCapacity(SColumnInfoData* pColumn, uint32_t numOfRows, bool clearPayload);
 int32_t blockDataEnsureCapacity(SSDataBlock* pDataBlock, uint32_t numOfRows);
-int32_t blockDataEnsureCapacityNoClear(SSDataBlock* pDataBlock, uint32_t numOfRows);
 
 void colInfoDataCleanup(SColumnInfoData* pColumn, uint32_t numOfRows);
 void blockDataCleanup(SSDataBlock* pDataBlock);
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index 171679baae..43f272d599 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -69,7 +69,7 @@ int32_t colDataAppend(SColumnInfoData* pColumnInfoData, uint32_t currentRow, con
     if (IS_VAR_DATA_TYPE(pColumnInfoData->info.type)) {
       pColumnInfoData->varmeta.offset[currentRow] = -1;  // it is a null value of VAR type.
     } else {
-      colDataSetNull_f(pColumnInfoData->nullbitmap, currentRow);
+      colDataSetNull_f_s(pColumnInfoData, currentRow);
     }
 
     pColumnInfoData->hasNull = true;
@@ -825,7 +825,7 @@ static int32_t blockDataAssign(SColumnInfoData* pCols, const SSDataBlock* pDataB
     } else {
       for (int32_t j = 0; j < pDataBlock->info.rows; ++j) {
         if (colDataIsNull_f(pSrc->nullbitmap, index[j])) {
-          colDataSetNull_f(pDst->nullbitmap, j);
+          colDataSetNull_f_s(pDst, j);
           continue;
         }
         memcpy(pDst->pData + j * pDst->info.bytes, pSrc->pData + index[j] * pDst->info.bytes, pDst->info.bytes);
@@ -1161,15 +1161,16 @@ void blockDataEmpty(SSDataBlock* pDataBlock) {
   pInfo->window.skey = 0;
 }
 
-// todo temporarily disable it
+/*
+ * NOTE: the type of the input column may be TSDB_DATA_TYPE_NULL, which is used to denote
+ * the all NULL value in this column. It is an internal representation of all NULL value column, and no visible to
+ * any users. The length of TSDB_DATA_TYPE_NULL is 0, and it is an special case.
+ */
 static int32_t doEnsureCapacity(SColumnInfoData* pColumn, const SDataBlockInfo* pBlockInfo, uint32_t numOfRows, bool clearPayload) {
   if (numOfRows <= 0 || numOfRows <= pBlockInfo->capacity) {
     return TSDB_CODE_SUCCESS;
   }
 
-  // todo temp disable it
-  //  ASSERT(pColumn->info.bytes != 0);
-
   int32_t existedRows = pBlockInfo->rows;
 
   if (IS_VAR_DATA_TYPE(pColumn->info.type)) {
@@ -1194,7 +1195,8 @@ static int32_t doEnsureCapacity(SColumnInfoData* pColumn, const SDataBlockInfo*
       return TSDB_CODE_FAILED;
     }
 
-    // make sure the allocated memory is MALLOC_ALIGN_BYTES aligned
+    // here we employ the aligned malloc function, to make sure that the address of allocated memory is aligned
+    // to MALLOC_ALIGN_BYTES
     tmp = taosMemoryMallocAlign(MALLOC_ALIGN_BYTES, numOfRows * pColumn->info.bytes);
     if (tmp == NULL) {
       return TSDB_CODE_OUT_OF_MEMORY;
@@ -1208,7 +1210,7 @@ static int32_t doEnsureCapacity(SColumnInfoData* pColumn, const SDataBlockInfo*
 
     pColumn->pData = tmp;
 
-    // todo remove it soon
+    // check if the allocated memory is aligned to the requried bytes.
 #if defined LINUX
     if ((((uint64_t)pColumn->pData) & (MALLOC_ALIGN_BYTES - 1)) != 0x0) {
       return TSDB_CODE_FAILED;
@@ -1249,25 +1251,6 @@ int32_t blockDataEnsureCapacity(SSDataBlock* pDataBlock, uint32_t numOfRows) {
     return TSDB_CODE_SUCCESS;
   }
 
-  size_t numOfCols = taosArrayGetSize(pDataBlock->pDataBlock);
-  for (int32_t i = 0; i < numOfCols; ++i) {
-    SColumnInfoData* p = taosArrayGet(pDataBlock->pDataBlock, i);
-    code = doEnsureCapacity(p, &pDataBlock->info, numOfRows, true);
-    if (code) {
-      return code;
-    }
-  }
-
-  pDataBlock->info.capacity = numOfRows;
-  return TSDB_CODE_SUCCESS;
-}
-
-int32_t blockDataEnsureCapacityNoClear(SSDataBlock* pDataBlock, uint32_t numOfRows) {
-  int32_t code = 0;
-  if (numOfRows == 0 || numOfRows <= pDataBlock->info.capacity) {
-    return TSDB_CODE_SUCCESS;
-  }
-
   size_t numOfCols = taosArrayGetSize(pDataBlock->pDataBlock);
   for (int32_t i = 0; i < numOfCols; ++i) {
     SColumnInfoData* p = taosArrayGet(pDataBlock->pDataBlock, i);
diff --git a/source/dnode/mgmt/mgmt_vnode/src/vmFile.c b/source/dnode/mgmt/mgmt_vnode/src/vmFile.c
index 8337fb5d10..bf176ebb40 100644
--- a/source/dnode/mgmt/mgmt_vnode/src/vmFile.c
+++ b/source/dnode/mgmt/mgmt_vnode/src/vmFile.c
@@ -14,8 +14,8 @@
  */
 
 #define _DEFAULT_SOURCE
-#include "vmInt.h"
 #include "tjson.h"
+#include "vmInt.h"
 
 #define MAX_CONTENT_LEN 2 * 1024 * 1024
 
@@ -46,102 +46,108 @@ SVnodeObj **vmGetVnodeListFromHash(SVnodeMgmt *pMgmt, int32_t *numOfVnodes) {
   return pVnodes;
 }
 
-int32_t vmGetVnodeListFromFile(SVnodeMgmt *pMgmt, SWrapperCfg **ppCfgs, int32_t *numOfVnodes) {
-  int32_t      code = TSDB_CODE_INVALID_JSON_FORMAT;
-  int32_t      len = 0;
-  int32_t      maxLen = MAX_CONTENT_LEN;
-  char        *content = taosMemoryCalloc(1, maxLen + 1);
-  cJSON       *root = NULL;
-  FILE        *fp = NULL;
-  char         file[PATH_MAX] = {0};
+static int32_t vmDecodeVnodeList(SJson *pJson, SVnodeMgmt *pMgmt, SWrapperCfg **ppCfgs, int32_t *numOfVnodes) {
+  int32_t      code = -1;
   SWrapperCfg *pCfgs = NULL;
-  TdFilePtr    pFile = NULL;
+  *ppCfgs = NULL;
 
-  snprintf(file, sizeof(file), "%s%svnodes.json", pMgmt->path, TD_DIRSEP);
-
-  pFile = taosOpenFile(file, TD_FILE_READ);
-  if (pFile == NULL) {
-    dInfo("file %s not exist", file);
-    code = 0;
-    goto _OVER;
-  }
-
-  if (content == NULL) {
-    terrno = TSDB_CODE_OUT_OF_MEMORY;
-    return -1;
-  }
-
-  len = (int32_t)taosReadFile(pFile, content, maxLen);
-  if (len <= 0) {
-    dError("failed to read %s since content is null", file);
-    goto _OVER;
-  }
-
-  content[len] = 0;
-  root = cJSON_Parse(content);
-  if (root == NULL) {
-    dError("failed to read %s since invalid json format", file);
-    goto _OVER;
-  }
-
-  cJSON *vnodes = cJSON_GetObjectItem(root, "vnodes");
-  if (!vnodes || vnodes->type != cJSON_Array) {
-    dError("failed to read %s since vnodes not found", file);
-    goto _OVER;
-  }
+  SJson *vnodes = tjsonGetObjectItem(pJson, "vnodes");
+  if (vnodes == NULL) return -1;
 
   int32_t vnodesNum = cJSON_GetArraySize(vnodes);
   if (vnodesNum > 0) {
     pCfgs = taosMemoryCalloc(vnodesNum, sizeof(SWrapperCfg));
-    if (pCfgs == NULL) {
-      dError("failed to read %s since out of memory", file);
-      code = TSDB_CODE_OUT_OF_MEMORY;
-      goto _OVER;
-    }
-
-    for (int32_t i = 0; i < vnodesNum; ++i) {
-      cJSON       *vnode = cJSON_GetArrayItem(vnodes, i);
-      SWrapperCfg *pCfg = &pCfgs[i];
-
-      cJSON *vgId = cJSON_GetObjectItem(vnode, "vgId");
-      if (!vgId || vgId->type != cJSON_Number) {
-        dError("failed to read %s since vgId not found", file);
-        taosMemoryFree(pCfgs);
-        goto _OVER;
-      }
-      pCfg->vgId = vgId->valueint;
-      snprintf(pCfg->path, sizeof(pCfg->path), "%s%svnode%d", pMgmt->path, TD_DIRSEP, pCfg->vgId);
-
-      cJSON *dropped = cJSON_GetObjectItem(vnode, "dropped");
-      if (!dropped || dropped->type != cJSON_Number) {
-        dError("failed to read %s since dropped not found", file);
-        taosMemoryFree(pCfgs);
-        goto _OVER;
-      }
-      pCfg->dropped = dropped->valueint;
-
-      cJSON *vgVersion = cJSON_GetObjectItem(vnode, "vgVersion");
-      if (!vgVersion || vgVersion->type != cJSON_Number) {
-        dError("failed to read %s since vgVersion not found", file);
-        taosMemoryFree(pCfgs);
-        goto _OVER;
-      }
-      pCfg->vgVersion = vgVersion->valueint;
-    }
-
-    *ppCfgs = pCfgs;
+    if (pCfgs == NULL) return -1;
+  }
+
+  for (int32_t i = 0; i < vnodesNum; ++i) {
+    SJson *vnode = tjsonGetArrayItem(vnodes, i);
+    if (vnode == NULL) goto _OVER;
+
+    SWrapperCfg *pCfg = &pCfgs[i];
+    tjsonGetInt32ValueFromDouble(vnode, "vgId", pCfg->vgId, code);
+    if (code < 0) goto _OVER;
+    tjsonGetInt32ValueFromDouble(vnode, "dropped", pCfg->dropped, code);
+    if (code < 0) goto _OVER;
+    tjsonGetInt32ValueFromDouble(vnode, "vgVersion", pCfg->vgVersion, code);
+    if (code < 0) goto _OVER;
+
+    snprintf(pCfg->path, sizeof(pCfg->path), "%s%svnode%d", pMgmt->path, TD_DIRSEP, pCfg->vgId);
   }
 
-  *numOfVnodes = vnodesNum;
   code = 0;
-  dInfo("succcessed to read file %s, numOfVnodes:%d", file, vnodesNum);
+  *ppCfgs = pCfgs;
+  *numOfVnodes = vnodesNum;
 
 _OVER:
-  if (content != NULL) taosMemoryFree(content);
-  if (root != NULL) cJSON_Delete(root);
+  if (*ppCfgs == NULL) taosMemoryFree(pCfgs);
+  return code;
+}
+
+int32_t vmGetVnodeListFromFile(SVnodeMgmt *pMgmt, SWrapperCfg **ppCfgs, int32_t *numOfVnodes) {
+  int32_t      code = -1;
+  TdFilePtr    pFile = NULL;
+  char        *pData = NULL;
+  SJson       *pJson = NULL;
+  char         file[PATH_MAX] = {0};
+  SWrapperCfg *pCfgs = NULL;
+  snprintf(file, sizeof(file), "%s%svnodes.json", pMgmt->path, TD_DIRSEP);
+
+  if (taosStatFile(file, NULL, NULL) < 0) {
+    dInfo("vnode file:%s not exist", file);
+    return 0;
+  }
+
+  pFile = taosOpenFile(file, TD_FILE_READ);
+  if (pFile == NULL) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to open vnode file:%s since %s", file, terrstr());
+    goto _OVER;
+  }
+
+  int64_t size = 0;
+  if (taosFStatFile(pFile, &size, NULL) < 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to fstat mnode file:%s since %s", file, terrstr());
+    goto _OVER;
+  }
+
+  pData = taosMemoryMalloc(size + 1);
+  if (pData == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    goto _OVER;
+  }
+
+  if (taosReadFile(pFile, pData, size) != size) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to read vnode file:%s since %s", file, terrstr());
+    goto _OVER;
+  }
+
+  pData[size] = '\0';
+
+  pJson = tjsonParse(pData);
+  if (pJson == NULL) {
+    terrno = TSDB_CODE_INVALID_JSON_FORMAT;
+    goto _OVER;
+  }
+
+  if (vmDecodeVnodeList(pJson, pMgmt, ppCfgs, numOfVnodes) < 0) {
+    terrno = TSDB_CODE_INVALID_JSON_FORMAT;
+    goto _OVER;
+  }
+
+  code = 0;
+  dInfo("succceed to read vnode file %s", file);
+
+_OVER:
+  if (pData != NULL) taosMemoryFree(pData);
+  if (pJson != NULL) cJSON_Delete(pJson);
   if (pFile != NULL) taosCloseFile(&pFile);
 
-  terrno = code;
+  if (code != 0) {
+    dError("failed to read vnode file:%s since %s", file, terrstr());
+  }
   return code;
 }
 
diff --git a/source/dnode/mgmt/node_util/src/dmEps.c b/source/dnode/mgmt/node_util/src/dmEps.c
index 3e2d8b53aa..7bae703753 100644
--- a/source/dnode/mgmt/node_util/src/dmEps.c
+++ b/source/dnode/mgmt/node_util/src/dmEps.c
@@ -41,14 +41,49 @@ static void dmGetDnodeEp(SDnodeData *pData, int32_t dnodeId, char *pEp, char *pF
   taosThreadRwlockUnlock(&pData->lock);
 }
 
+static int32_t dmDecodeEps(SJson *pJson, SDnodeData *pData) {
+  int32_t code = 0;
+
+  tjsonGetInt32ValueFromDouble(pJson, "dnodeId", pData->dnodeId, code);
+  if (code < 0) return -1;
+  tjsonGetNumberValue(pJson, "dnodeVer", pData->dnodeVer, code);
+  if (code < 0) return -1;
+  tjsonGetNumberValue(pJson, "clusterId", pData->clusterId, code);
+  if (code < 0) return -1;
+  tjsonGetInt32ValueFromDouble(pJson, "dropped", pData->dropped, code);
+  if (code < 0) return -1;
+
+  SJson *dnodes = tjsonGetObjectItem(pJson, "dnodes");
+  if (dnodes == NULL) return 0;
+  int32_t numOfDnodes = tjsonGetArraySize(dnodes);
+
+  for (int32_t i = 0; i < numOfDnodes; ++i) {
+    SJson *dnode = tjsonGetArrayItem(dnodes, i);
+    if (dnode == NULL) return -1;
+
+    SDnodeEp dnodeEp = {0};
+    tjsonGetInt32ValueFromDouble(dnode, "id", dnodeEp.id, code);
+    if (code < 0) return -1;
+    code = tjsonGetStringValue(dnode, "fqdn", dnodeEp.ep.fqdn);
+    if (code < 0) return -1;
+    tjsonGetUInt16ValueFromDouble(dnode, "port", dnodeEp.ep.port, code);
+    if (code < 0) return -1;
+    tjsonGetInt8ValueFromDouble(dnode, "isMnode", dnodeEp.isMnode, code);
+    if (code < 0) return -1;
+
+    if (taosArrayPush(pData->dnodeEps, &dnodeEp) == NULL) return -1;
+  }
+
+  return 0;
+}
+
 int32_t dmReadEps(SDnodeData *pData) {
-  int32_t   code = TSDB_CODE_INVALID_JSON_FORMAT;
-  int32_t   len = 0;
-  int32_t   maxLen = 256 * 1024;
-  char     *content = taosMemoryCalloc(1, maxLen + 1);
-  cJSON    *root = NULL;
-  char      file[PATH_MAX] = {0};
+  int32_t   code = -1;
   TdFilePtr pFile = NULL;
+  char     *content = NULL;
+  SJson    *pJson = NULL;
+  char      file[PATH_MAX] = {0};
+  snprintf(file, sizeof(file), "%s%sdnode%sdnode.json", tsDataDir, TD_DIRSEP, TD_DIRSEP);
 
   pData->dnodeEps = taosArrayInit(1, sizeof(SDnodeEp));
   if (pData->dnodeEps == NULL) {
@@ -56,113 +91,63 @@ int32_t dmReadEps(SDnodeData *pData) {
     goto _OVER;
   }
 
-  snprintf(file, sizeof(file), "%s%sdnode%sdnode.json", tsDataDir, TD_DIRSEP, TD_DIRSEP);
-  pFile = taosOpenFile(file, TD_FILE_READ);
-  if (pFile == NULL) {
+  if (taosStatFile(file, NULL, NULL) < 0) {
+    dInfo("dnode file:%s not exist", file);
     code = 0;
     goto _OVER;
   }
 
-  len = (int32_t)taosReadFile(pFile, content, maxLen);
-  if (len <= 0) {
-    dError("failed to read %s since content is null", file);
+  pFile = taosOpenFile(file, TD_FILE_READ);
+  if (pFile == NULL) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to open dnode file:%s since %s", file, terrstr());
     goto _OVER;
   }
 
-  content[len] = 0;
-  root = cJSON_Parse(content);
-  if (root == NULL) {
-    dError("failed to read %s since invalid json format", file);
+  int64_t size = 0;
+  if (taosFStatFile(pFile, &size, NULL) < 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to fstat dnode file:%s since %s", file, terrstr());
     goto _OVER;
   }
 
-  cJSON *dnodeId = cJSON_GetObjectItem(root, "dnodeId");
-  if (!dnodeId || dnodeId->type != cJSON_Number) {
-    dError("failed to read %s since dnodeId not found", file);
-    goto _OVER;
-  }
-  pData->dnodeId = dnodeId->valueint;
-
-  cJSON *dnodeVer = cJSON_GetObjectItem(root, "dnodeVer");
-  if (!dnodeVer || dnodeVer->type != cJSON_String) {
-    dError("failed to read %s since dnodeVer not found", file);
-    goto _OVER;
-  }
-  pData->dnodeVer = atoll(dnodeVer->valuestring);
-
-  cJSON *clusterId = cJSON_GetObjectItem(root, "clusterId");
-  if (!clusterId || clusterId->type != cJSON_String) {
-    dError("failed to read %s since clusterId not found", file);
-    goto _OVER;
-  }
-  pData->clusterId = atoll(clusterId->valuestring);
-
-  cJSON *dropped = cJSON_GetObjectItem(root, "dropped");
-  if (!dropped || dropped->type != cJSON_Number) {
-    dError("failed to read %s since dropped not found", file);
-    goto _OVER;
-  }
-  pData->dropped = dropped->valueint;
-
-  cJSON *dnodes = cJSON_GetObjectItem(root, "dnodes");
-  if (!dnodes || dnodes->type != cJSON_Array) {
-    dError("failed to read %s since dnodes not found", file);
+  content = taosMemoryMalloc(size + 1);
+  if (content == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
     goto _OVER;
   }
 
-  int32_t numOfDnodes = cJSON_GetArraySize(dnodes);
-  if (numOfDnodes <= 0) {
-    dError("failed to read %s since numOfDnodes:%d invalid", file, numOfDnodes);
+  if (taosReadFile(pFile, content, size) != size) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to read dnode file:%s since %s", file, terrstr());
     goto _OVER;
   }
 
-  for (int32_t i = 0; i < numOfDnodes; ++i) {
-    cJSON *node = cJSON_GetArrayItem(dnodes, i);
-    if (node == NULL) break;
+  content[size] = '\0';
 
-    SDnodeEp dnodeEp = {0};
+  pJson = tjsonParse(content);
+  if (pJson == NULL) {
+    terrno = TSDB_CODE_INVALID_JSON_FORMAT;
+    goto _OVER;
+  }
 
-    cJSON *did = cJSON_GetObjectItem(node, "id");
-    if (!did || did->type != cJSON_Number) {
-      dError("failed to read %s since dnodeId not found", file);
-      goto _OVER;
-    }
-
-    dnodeEp.id = did->valueint;
-
-    cJSON *dnodeFqdn = cJSON_GetObjectItem(node, "fqdn");
-    if (!dnodeFqdn || dnodeFqdn->type != cJSON_String || dnodeFqdn->valuestring == NULL) {
-      dError("failed to read %s since dnodeFqdn not found", file);
-      goto _OVER;
-    }
-    tstrncpy(dnodeEp.ep.fqdn, dnodeFqdn->valuestring, TSDB_FQDN_LEN);
-
-    cJSON *dnodePort = cJSON_GetObjectItem(node, "port");
-    if (!dnodePort || dnodePort->type != cJSON_Number) {
-      dError("failed to read %s since dnodePort not found", file);
-      goto _OVER;
-    }
-
-    dnodeEp.ep.port = dnodePort->valueint;
-
-    cJSON *isMnode = cJSON_GetObjectItem(node, "isMnode");
-    if (!isMnode || isMnode->type != cJSON_Number) {
-      dError("failed to read %s since isMnode not found", file);
-      goto _OVER;
-    }
-    dnodeEp.isMnode = isMnode->valueint;
-
-    taosArrayPush(pData->dnodeEps, &dnodeEp);
+  if (dmDecodeEps(pJson, pData) < 0) {
+    terrno = TSDB_CODE_INVALID_JSON_FORMAT;
+    goto _OVER;
   }
 
   code = 0;
-  dDebug("succcessed to read file %s", file);
+  dInfo("succceed to read mnode file %s", file);
 
 _OVER:
   if (content != NULL) taosMemoryFree(content);
-  if (root != NULL) cJSON_Delete(root);
+  if (pJson != NULL) cJSON_Delete(pJson);
   if (pFile != NULL) taosCloseFile(&pFile);
 
+  if (code != 0) {
+    dError("failed to read dnode file:%s since %s", file, terrstr());
+  }
+
   if (taosArrayGetSize(pData->dnodeEps) == 0) {
     SDnodeEp dnodeEp = {0};
     dnodeEp.isMnode = 1;
@@ -178,7 +163,6 @@ _OVER:
     return -1;
   }
 
-  terrno = code;
   return code;
 }
 
@@ -247,7 +231,7 @@ _OVER:
 
   if (code != 0) {
     if (terrno == 0) terrno = TAOS_SYSTEM_ERROR(errno);
-    dInfo("succeed to write dnode file:%s since %s, dnodeVer:%" PRId64, realfile, terrstr(), pData->dnodeVer);
+    dError("failed to write dnode file:%s since %s, dnodeVer:%" PRId64, realfile, terrstr(), pData->dnodeVer);
   }
   return code;
 }
diff --git a/source/dnode/mgmt/node_util/src/dmFile.c b/source/dnode/mgmt/node_util/src/dmFile.c
index 4dcc962a20..fb05f08c0c 100644
--- a/source/dnode/mgmt/node_util/src/dmFile.c
+++ b/source/dnode/mgmt/node_util/src/dmFile.c
@@ -19,48 +19,81 @@
 
 #define MAXLEN 1024
 
-int32_t dmReadFile(const char *path, const char *name, bool *pDeployed) {
-  int32_t   code = TSDB_CODE_INVALID_JSON_FORMAT;
-  int64_t   len = 0;
-  char      content[MAXLEN + 1] = {0};
-  cJSON    *root = NULL;
-  char      file[PATH_MAX] = {0};
-  TdFilePtr pFile = NULL;
+static int32_t dmDecodeFile(SJson *pJson, bool *deployed) {
+  int32_t code = 0;
+  int32_t value = 0;
 
+  tjsonGetInt32ValueFromDouble(pJson, "deployed", value, code);
+  if (code < 0) return -1;
+
+  *deployed = (value != 0);
+  return code;
+}
+
+int32_t dmReadFile(const char *path, const char *name, bool *pDeployed) {
+  int32_t   code = -1;
+  TdFilePtr pFile = NULL;
+  char     *content = NULL;
+  SJson    *pJson = NULL;
+  char      file[PATH_MAX] = {0};
   snprintf(file, sizeof(file), "%s%s%s.json", path, TD_DIRSEP, name);
-  pFile = taosOpenFile(file, TD_FILE_READ);
-  if (pFile == NULL) {
+
+  if (taosStatFile(file, NULL, NULL) < 0) {
+    dInfo("file:%s not exist", file);
     code = 0;
     goto _OVER;
   }
 
-  len = taosReadFile(pFile, content, MAXLEN);
-  if (len <= 0) {
-    dError("failed to read %s since content is null", file);
+  pFile = taosOpenFile(file, TD_FILE_READ);
+  if (pFile == NULL) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to open file:%s since %s", file, terrstr());
     goto _OVER;
   }
 
-  root = cJSON_Parse(content);
-  if (root == NULL) {
-    dError("failed to read %s since invalid json format", file);
+  int64_t size = 0;
+  if (taosFStatFile(pFile, &size, NULL) < 0) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to fstat file:%s since %s", file, terrstr());
     goto _OVER;
   }
 
-  cJSON *deployed = cJSON_GetObjectItem(root, "deployed");
-  if (!deployed || deployed->type != cJSON_Number) {
-    dError("failed to read %s since deployed not found", file);
+  content = taosMemoryMalloc(size + 1);
+  if (content == NULL) {
+    terrno = TSDB_CODE_OUT_OF_MEMORY;
+    goto _OVER;
+  }
+
+  if (taosReadFile(pFile, content, size) != size) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
+    dError("failed to read file:%s since %s", file, terrstr());
+    goto _OVER;
+  }
+
+  content[size] = '\0';
+
+  pJson = tjsonParse(content);
+  if (pJson == NULL) {
+    terrno = TSDB_CODE_INVALID_JSON_FORMAT;
+    goto _OVER;
+  }
+
+  if (dmDecodeFile(pJson, pDeployed) < 0) {
+    terrno = TSDB_CODE_INVALID_JSON_FORMAT;
     goto _OVER;
   }
-  *pDeployed = deployed->valueint != 0;
 
-  dDebug("succcessed to read file %s, deployed:%d", file, *pDeployed);
   code = 0;
+  dInfo("succceed to read mnode file %s", file);
 
 _OVER:
-  if (root != NULL) cJSON_Delete(root);
+  if (content != NULL) taosMemoryFree(content);
+  if (pJson != NULL) cJSON_Delete(pJson);
   if (pFile != NULL) taosCloseFile(&pFile);
 
-  terrno = code;
+  if (code != 0) {
+    dError("failed to read dnode file:%s since %s", file, terrstr());
+  }
   return code;
 }
 
diff --git a/source/libs/executor/src/projectoperator.c b/source/libs/executor/src/projectoperator.c
index 926720fc65..4d38f2c8e9 100644
--- a/source/libs/executor/src/projectoperator.c
+++ b/source/libs/executor/src/projectoperator.c
@@ -279,7 +279,6 @@ SSDataBlock* doProjectOperation(SOperatorInfo* pOperator) {
       // for stream interval
       if (pBlock->info.type == STREAM_RETRIEVE || pBlock->info.type == STREAM_DELETE_RESULT ||
           pBlock->info.type == STREAM_DELETE_DATA) {
-        // printDataBlock1(pBlock, "project1");
         return pBlock;
       }
 
diff --git a/source/libs/executor/src/sysscanoperator.c b/source/libs/executor/src/sysscanoperator.c
index ac32b54f56..05570eda2f 100644
--- a/source/libs/executor/src/sysscanoperator.c
+++ b/source/libs/executor/src/sysscanoperator.c
@@ -1918,6 +1918,13 @@ static SSDataBlock* doBlockInfoScan(SOperatorInfo* pOperator) {
   colDataAppend(pColInfo, 0, p, false);
   taosMemoryFree(p);
 
+  // make the valgrind happy that all memory buffer has been initialized already.
+  if (slotId != 0) {
+    SColumnInfoData* p1 = taosArrayGet(pBlock->pDataBlock, 0);
+    int64_t v = 0;
+    colDataAppendInt64(p1, 0, &v);
+  }
+
   pBlock->info.rows = 1;
   pOperator->status = OP_EXEC_DONE;
   return pBlock;
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index cd224b716e..324011f238 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -1662,7 +1662,9 @@ int32_t percentileFunction(SqlFunctionCtx* pCtx) {
 
 int32_t percentileFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
   SVariant* pVal = &pCtx->param[1].param;
+  int32_t code = 0;
   double    v = 0;
+
   GET_TYPED_DATA(v, double, pVal->nType, &pVal->i);
 
   SResultRowEntryInfo* pResInfo = GET_RES_INFO(pCtx);
@@ -1670,14 +1672,14 @@ int32_t percentileFinalize(SqlFunctionCtx* pCtx, SSDataBlock* pBlock) {
 
   tMemBucket* pMemBucket = ppInfo->pMemBucket;
   if (pMemBucket != NULL && pMemBucket->total > 0) {  // check for null
-    int32_t code = getPercentile(pMemBucket, v, &ppInfo->result);
-    if (code != TSDB_CODE_SUCCESS) {
-      tMemBucketDestroy(pMemBucket);
-      return code;
-    }
+    code = getPercentile(pMemBucket, v, &ppInfo->result);
   }
 
   tMemBucketDestroy(pMemBucket);
+  if (code != TSDB_CODE_SUCCESS) {
+    return code;
+  }
+
   return functionFinalize(pCtx, pBlock);
 }
 
@@ -2644,7 +2646,7 @@ static int32_t doHandleDiff(SDiffInfo* pDiffInfo, int32_t type, const char* pv,
       int32_t v = *(int32_t*)pv;
       int64_t delta = factor * (v - pDiffInfo->prev.i64);  // direct previous may be null
       if (delta < 0 && pDiffInfo->ignoreNegative) {
-        colDataSetNull_f(pOutput->nullbitmap, pos);
+        colDataSetNull_f_s(pOutput, pos);
       } else {
         colDataAppendInt64(pOutput, pos, &delta);
       }
@@ -2657,7 +2659,7 @@ static int32_t doHandleDiff(SDiffInfo* pDiffInfo, int32_t type, const char* pv,
       int8_t  v = *(int8_t*)pv;
       int64_t delta = factor * (v - pDiffInfo->prev.i64);  // direct previous may be null
       if (delta < 0 && pDiffInfo->ignoreNegative) {
-        colDataSetNull_f(pOutput->nullbitmap, pos);
+        colDataSetNull_f_s(pOutput, pos);
       } else {
         colDataAppendInt64(pOutput, pos, &delta);
       }
@@ -2668,7 +2670,7 @@ static int32_t doHandleDiff(SDiffInfo* pDiffInfo, int32_t type, const char* pv,
       int16_t v = *(int16_t*)pv;
       int64_t delta = factor * (v - pDiffInfo->prev.i64);  // direct previous may be null
       if (delta < 0 && pDiffInfo->ignoreNegative) {
-        colDataSetNull_f(pOutput->nullbitmap, pos);
+        colDataSetNull_f_s(pOutput, pos);
       } else {
         colDataAppendInt64(pOutput, pos, &delta);
       }
@@ -2680,7 +2682,7 @@ static int32_t doHandleDiff(SDiffInfo* pDiffInfo, int32_t type, const char* pv,
       int64_t v = *(int64_t*)pv;
       int64_t delta = factor * (v - pDiffInfo->prev.i64);  // direct previous may be null
       if (delta < 0 && pDiffInfo->ignoreNegative) {
-        colDataSetNull_f(pOutput->nullbitmap, pos);
+        colDataSetNull_f_s(pOutput, pos);
       } else {
         colDataAppendInt64(pOutput, pos, &delta);
       }
@@ -2691,7 +2693,7 @@ static int32_t doHandleDiff(SDiffInfo* pDiffInfo, int32_t type, const char* pv,
       float  v = *(float*)pv;
       double delta = factor * (v - pDiffInfo->prev.d64);                               // direct previous may be null
       if ((delta < 0 && pDiffInfo->ignoreNegative) || isinf(delta) || isnan(delta)) {  // check for overflow
-        colDataSetNull_f(pOutput->nullbitmap, pos);
+        colDataSetNull_f_s(pOutput, pos);
       } else {
         colDataAppendDouble(pOutput, pos, &delta);
       }
@@ -2702,7 +2704,7 @@ static int32_t doHandleDiff(SDiffInfo* pDiffInfo, int32_t type, const char* pv,
       double v = *(double*)pv;
       double delta = factor * (v - pDiffInfo->prev.d64);                               // direct previous may be null
       if ((delta < 0 && pDiffInfo->ignoreNegative) || isinf(delta) || isnan(delta)) {  // check for overflow
-        colDataSetNull_f(pOutput->nullbitmap, pos);
+        colDataSetNull_f_s(pOutput, pos);
       } else {
         colDataAppendDouble(pOutput, pos, &delta);
       }
@@ -2737,7 +2739,7 @@ int32_t diffFunction(SqlFunctionCtx* pCtx) {
 
       if (colDataIsNull_f(pInputCol->nullbitmap, i)) {
         if (pDiffInfo->includeNull) {
-          colDataSetNull_f(pOutput->nullbitmap, pos);
+          colDataSetNull_f_s(pOutput, pos);
 
           numOfElems += 1;
         }
@@ -2775,8 +2777,7 @@ int32_t diffFunction(SqlFunctionCtx* pCtx) {
 
       if (colDataIsNull_f(pInputCol->nullbitmap, i)) {
         if (pDiffInfo->includeNull) {
-          colDataSetNull_f(pOutput->nullbitmap, pos);
-
+          colDataSetNull_f_s(pOutput, pos);
           numOfElems += 1;
         }
         continue;
diff --git a/source/libs/function/src/tpercentile.c b/source/libs/function/src/tpercentile.c
index acadb9de1b..871b668cfd 100644
--- a/source/libs/function/src/tpercentile.c
+++ b/source/libs/function/src/tpercentile.c
@@ -92,6 +92,7 @@ static void resetPosInfo(SSlotInfo *pInfo) {
 
 int32_t findOnlyResult(tMemBucket *pMemBucket, double *result) {
   ASSERT(pMemBucket->total == 1);
+  terrno = 0;
 
   for (int32_t i = 0; i < pMemBucket->numOfSlots; ++i) {
     tMemBucketSlot *pSlot = &pMemBucket->pSlots[i];
diff --git a/source/libs/scalar/src/filter.c b/source/libs/scalar/src/filter.c
index de660ae958..74d555af77 100644
--- a/source/libs/scalar/src/filter.c
+++ b/source/libs/scalar/src/filter.c
@@ -3181,6 +3181,7 @@ bool filterExecuteImplRange(void *pinfo, int32_t numOfRows, SColumnInfoData *pRe
     void *colData = colDataGetData(pData, i);
     if (colData == NULL || colDataIsNull_s(pData, i)) {
       all = false;
+      p[i] = 0;
       continue;
     }
 
diff --git a/source/libs/tdb/src/db/tdbBtree.c b/source/libs/tdb/src/db/tdbBtree.c
index 79d37b7674..029039f911 100644
--- a/source/libs/tdb/src/db/tdbBtree.c
+++ b/source/libs/tdb/src/db/tdbBtree.c
@@ -1063,11 +1063,11 @@ static int tdbBtreeEncodePayload(SPage *pPage, SCell *pCell, int nHeader, const
     } else {
       int nLeftKey = kLen;
       // pack partial key and nextPgno
-      memcpy(pCell + nHeader, pKey, nLocal - 4);
-      nLeft -= nLocal - 4;
-      nLeftKey -= nLocal - 4;
+      memcpy(pCell + nHeader, pKey, nLocal - nHeader - sizeof(pgno));
+      nLeft -= nLocal - nHeader - sizeof(pgno);
+      nLeftKey -= nLocal - nHeader - sizeof(pgno);
 
-      memcpy(pCell + nHeader + nLocal - 4, &pgno, sizeof(pgno));
+      memcpy(pCell + nLocal - sizeof(pgno), &pgno, sizeof(pgno));
 
       int lastKeyPageSpace = 0;
       // pack left key & val to ovpages
@@ -1087,9 +1087,12 @@ static int tdbBtreeEncodePayload(SPage *pPage, SCell *pCell, int nHeader, const
 
         if (lastKeyPage) {
           if (lastKeyPageSpace >= vLen) {
-            memcpy(pBuf + kLen - nLeftKey, pVal, vLen);
+            if (vLen > 0) {
+              memcpy(pBuf + kLen - nLeftKey, pVal, vLen);
+
+              nLeft -= vLen;
+            }
 
-            nLeft -= vLen;
             pgno = 0;
           } else {
             memcpy(pBuf + kLen - nLeftKey, pVal, lastKeyPageSpace);
@@ -1111,7 +1114,7 @@ static int tdbBtreeEncodePayload(SPage *pPage, SCell *pCell, int nHeader, const
           }
         }
 
-        memcpy(pBuf + kLen - nLeft, &pgno, sizeof(pgno));
+        memcpy(pBuf + bytes, &pgno, sizeof(pgno));
 
         ret = tdbPageInsertCell(ofp, 0, pBuf, bytes + sizeof(pgno), 0);
         if (ret < 0) {
diff --git a/tests/parallel_test/cases.task b/tests/parallel_test/cases.task
index 1205da31b3..d4fe45d42b 100644
--- a/tests/parallel_test/cases.task
+++ b/tests/parallel_test/cases.task
@@ -1039,6 +1039,11 @@
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/insert_null_none.py -Q 2
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/insert_null_none.py -Q 3
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/insert_null_none.py -Q 4
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/out_of_order.py
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/out_of_order.py -R
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/out_of_order.py -Q 2
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/out_of_order.py -Q 3
+,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/out_of_order.py -Q 4
 ,,y,system-test,./pytest.sh python3 ./test.py -f 2-query/blockSMA.py -Q 4
 ,,y,system-test,./pytest.sh python3 ./test.py -f 99-TDcase/TD-21561.py -Q 4
 ,,y,system-test,./pytest.sh python3 ./test.py -f 99-TDcase/TD-20582.py
diff --git a/tests/script/tsim/parser/alter1.sim b/tests/script/tsim/parser/alter1.sim
index 369419dcd9..cf9da46fba 100644
--- a/tests/script/tsim/parser/alter1.sim
+++ b/tests/script/tsim/parser/alter1.sim
@@ -88,6 +88,7 @@ sql insert into car1 values (now, 1, 1,1 ) (now +1s, 2,2,2) car2 values (now, 1,
 
 sql select c1+speed from stb where c1 > 0
 if $rows != 3 then
+  print $rows , expect 3
   return -1
 endi
 
diff --git a/tests/system-test/2-query/nestedQuery.py b/tests/system-test/2-query/nestedQuery.py
index 034ab8dcdc..3d0db9a562 100755
--- a/tests/system-test/2-query/nestedQuery.py
+++ b/tests/system-test/2-query/nestedQuery.py
@@ -851,6 +851,7 @@ class TDTestCase:
         tdLog.info("========mark==%s==="% mark);
         try:
             tdSql.query(sql,queryTimes=1)
+            self.explain_sql(sql)
         except:
             tdLog.info("sql is not support :=====%s; " %sql)
             tdSql.error(sql)
@@ -4995,9 +4996,7 @@ class TDTestCase:
             sql += "%s ;" % random.choice(self.limit_u_where)
             tdLog.info(sql)
             tdLog.info(len(sql))
-            tdSql.query(sql)
-            self.cur1.execute(sql)
-            self.explain_sql(sql)
+            self.data_check(sql,mark='15-2')
 
         tdSql.query("select 15-2.2 from stable_1;")
         for i in range(self.fornum):
@@ -5013,9 +5012,7 @@ class TDTestCase:
             sql += "%s ;" % random.choice(self.limit_u_where)
             tdLog.info(sql)
             tdLog.info(len(sql))
-            tdSql.query(sql)
-            self.cur1.execute(sql)
-            self.explain_sql(sql)
+            self.data_check(sql,mark='15-2.2')
 
         self.restartDnodes()
         tdSql.query("select 15-3 from stable_1;")
@@ -5033,9 +5030,7 @@ class TDTestCase:
             sql += "%s " % random.choice(self.limit_where)
             tdLog.info(sql)
             tdLog.info(len(sql))
-            tdSql.query(sql)
-            self.cur1.execute(sql)
-            self.explain_sql(sql)
+            self.data_check(sql,mark='15-3')
 
         tdSql.query("select 15-4 from stable_1;")
         for i in range(self.fornum):
@@ -5052,9 +5047,7 @@ class TDTestCase:
             sql += "%s " % random.choice(self.limit_u_where)
             tdLog.info(sql)
             tdLog.info(len(sql))
-            tdSql.query(sql)
-            self.cur1.execute(sql)
-            self.explain_sql(sql)
+            self.data_check(sql,mark='15-4')
 
         tdSql.query("select 15-4.2 from stable_1;")
         for i in range(self.fornum):
@@ -5087,8 +5080,7 @@ class TDTestCase:
             tdLog.info(sql)
             tdLog.info(len(sql))
             tdSql.query(sql)
-            self.cur1.execute(sql)
-            self.explain_sql(sql)
+            self.data_check(sql,mark='15-5')
 
         #16 select * from (select calc_aggregate_regulars as agg from regular_table  where <\>\in\and\or  order by limit offset )
         #self.dropandcreateDB_random("%s" %db, 1)
diff --git a/tests/system-test/2-query/out_of_order.py b/tests/system-test/2-query/out_of_order.py
new file mode 100644
index 0000000000..5b52661bae
--- /dev/null
+++ b/tests/system-test/2-query/out_of_order.py
@@ -0,0 +1,191 @@
+###################################################################
+#           Copyright (c) 2016 by TAOS Technologies, Inc.
+#                     All rights reserved.
+#
+#  This file is proprietary and confidential to TAOS Technologies.
+#  No part of this file may be reproduced, stored, transmitted,
+#  disclosed or used in any form or by any means other than as
+#  expressly provided by the written permission from Jianhui Tao
+#
+###################################################################
+
+# -*- coding: utf-8 -*-
+
+import sys
+import os
+import random
+
+from util.log import *
+from util.cases import *
+from util.sql import *
+from util.dnodes import *
+
+
+class TDTestCase:
+    def init(self, conn, logSql, replicaVar):
+        tdLog.debug("start to execute %s" % __file__)
+        tdSql.init(conn.cursor(), logSql)
+        
+    def getBuildPath(self):
+        selfPath = os.path.dirname(os.path.realpath(__file__))
+
+        if ("community" in selfPath):
+            projPath = selfPath[:selfPath.find("community")]
+        else:
+            projPath = selfPath[:selfPath.find("tests")]
+
+        for root, dirs, files in os.walk(projPath):
+            if ("taosd" in files):
+                rootRealPath = os.path.dirname(os.path.realpath(root))
+                if ("packaging" not in rootRealPath):
+                    buildPath = root[:len(root)-len("/build/bin")]
+                    break
+        return buildPath
+        
+    def run_benchmark(self,dbname,tables,per_table_num,order,replica):
+        #O :Out of order 
+        #A :Repliaca
+        buildPath = self.getBuildPath()
+        if (buildPath == ""):
+            tdLog.exit("taosd not found!")
+        else:
+            tdLog.info("taosd found in %s" % buildPath)
+        binPath = buildPath+ "/build/bin/"
+
+        os.system("%staosBenchmark -d %s -t %d -n %d -O %d -a %d -b float,double,nchar\(200\),binary\(50\) -T 50 -y " % (binPath,dbname,tables,per_table_num,order,replica))
+        
+    def sql_base(self,dbname):
+        self.check_sub(dbname)
+        sql1 = "select count(*) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql1)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(ts) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(_c0) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c0) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c1) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c2) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c3) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(t0) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(t1) from %s.meters" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        
+        self.check_sub(dbname)
+        sql2 = "select count(ts) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(_c0) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c0) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c1) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c2) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(c3) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(t0) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        self.check_sub(dbname)
+        sql2 = "select count(t1) from (select * from %s.meters)" %dbname
+        self.sql_base_check(sql1,sql2)
+        
+        
+    def sql_base_check(self,sql1,sql2):
+        tdSql.query(sql1)
+        sql1_result = tdSql.getData(0,0)
+        tdLog.info("sql:%s , result: %s" %(sql1,sql1_result))
+        
+        tdSql.query(sql2)
+        sql2_result = tdSql.getData(0,0)
+        tdLog.info("sql:%s , result: %s" %(sql2,sql2_result))
+        
+        if sql1_result==sql2_result:
+            tdLog.info(f"checkEqual success, sql1_result={sql1_result},sql2_result={sql2_result}") 
+        else :
+            tdLog.exit(f"checkEqual error, sql1_result=={sql1_result},sql2_result={sql2_result}") 
+                
+    def run_sql(self,dbname):
+        self.sql_base(dbname)
+        
+        tdSql.execute(" flush database %s;" %dbname)
+        
+        self.sql_base(dbname)
+                
+    def check_sub(self,dbname):
+        
+        sql = "select count(*) from (select distinct(tbname) from %s.meters)" %dbname
+        tdSql.query(sql)
+        num = tdSql.getData(0,0)
+        
+        for i in range(0,num):
+            sql1 = "select count(*) from %s.d%d" %(dbname,i)
+            tdSql.query(sql1)
+            sql1_result = tdSql.getData(0,0)
+            tdLog.info("sql:%s , result: %s" %(sql1,sql1_result))
+           
+    def check_out_of_order(self,dbname,tables,per_table_num,order,replica):
+        self.run_benchmark(dbname,tables,per_table_num,order,replica)
+        print("sleep 10 seconds")
+        #time.sleep(10)
+        print("sleep 10 seconds finish")
+        
+        self.run_sql(dbname)
+            
+    def run(self):
+        startTime = time.time()  
+        
+        #self.check_out_of_order('db1',10,random.randint(10000,50000),random.randint(1,10),1)  
+        self.check_out_of_order('db1',random.randint(50,200),random.randint(10000,20000),random.randint(1,5),1)      
+        
+        # self.check_out_of_order('db2',random.randint(50,200),random.randint(10000,50000),random.randint(5,50),1)  
+         
+        # self.check_out_of_order('db3',random.randint(50,200),random.randint(10000,50000),random.randint(50,100),1)         
+        
+        # self.check_out_of_order('db4',random.randint(50,200),random.randint(10000,50000),100,1)    
+         
+        endTime = time.time()
+        print("total time %ds" % (endTime - startTime))
+       
+        
+    def stop(self):
+        tdSql.close()
+        tdLog.success("%s successfully executed" % __file__)
+
+
+tdCases.addWindows(__file__, TDTestCase())
+tdCases.addLinux(__file__, TDTestCase())