diff --git a/include/libs/executor/executor.h b/include/libs/executor/executor.h
index a7fae403edbb608945840da7237080258aa37e1c..e15708e357973d707a4312a6b21911c0f586654e 100644
--- a/include/libs/executor/executor.h
+++ b/include/libs/executor/executor.h
@@ -155,7 +155,7 @@ int32_t qGetQualifiedTableIdList(void* pTableList, const char* tagCond, int32_t
 
 void qProcessRspMsg(void* parent, struct SRpcMsg* pMsg, struct SEpSet* pEpSet);
 
-int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, int32_t* resNum, SExplainExecInfo** pRes);
+int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, SArray* pExecInfoList/*,int32_t* resNum, SExplainExecInfo** pRes*/);
 
 int32_t qSerializeTaskStatus(qTaskInfo_t tinfo, char** pOutput, int32_t* len);
 
diff --git a/source/common/src/tdatablock.c b/source/common/src/tdatablock.c
index faee6cc2facc9ddcc4cdcabf2c8b554ac9a673b7..cc4b6a289033bab81a47acc835a2ed13926a5026 100644
--- a/source/common/src/tdatablock.c
+++ b/source/common/src/tdatablock.c
@@ -16,65 +16,9 @@
 #define _DEFAULT_SOURCE
 #include "tdatablock.h"
 #include "tcompare.h"
-#include "tglobal.h"
 #include "tlog.h"
 #include "tname.h"
 
-int32_t taosGetFqdnPortFromEp(const char* ep, SEp* pEp) {
-  pEp->port = 0;
-  strcpy(pEp->fqdn, ep);
-
-  char* temp = strchr(pEp->fqdn, ':');
-  if (temp) {
-    *temp = 0;
-    pEp->port = atoi(temp + 1);
-  }
-
-  if (pEp->port == 0) {
-    pEp->port = tsServerPort;
-  }
-
-  return 0;
-}
-
-void addEpIntoEpSet(SEpSet* pEpSet, const char* fqdn, uint16_t port) {
-  if (pEpSet == NULL || fqdn == NULL || strlen(fqdn) == 0) {
-    return;
-  }
-
-  int32_t index = pEpSet->numOfEps;
-  tstrncpy(pEpSet->eps[index].fqdn, fqdn, tListLen(pEpSet->eps[index].fqdn));
-  pEpSet->eps[index].port = port;
-  pEpSet->numOfEps += 1;
-}
-
-bool isEpsetEqual(const SEpSet* s1, const SEpSet* s2) {
-  if (s1->numOfEps != s2->numOfEps || s1->inUse != s2->inUse) {
-    return false;
-  }
-
-  for (int32_t i = 0; i < s1->numOfEps; i++) {
-    if (s1->eps[i].port != s2->eps[i].port || strncmp(s1->eps[i].fqdn, s2->eps[i].fqdn, TSDB_FQDN_LEN) != 0)
-      return false;
-  }
-  return true;
-}
-
-void updateEpSet_s(SCorEpSet* pEpSet, SEpSet* pNewEpSet) {
-  taosCorBeginWrite(&pEpSet->version);
-  pEpSet->epSet = *pNewEpSet;
-  taosCorEndWrite(&pEpSet->version);
-}
-
-SEpSet getEpSet_s(SCorEpSet* pEpSet) {
-  SEpSet ep = {0};
-  taosCorBeginRead(&pEpSet->version);
-  ep = pEpSet->epSet;
-  taosCorEndRead(&pEpSet->version);
-
-  return ep;
-}
-
 int32_t colDataGetLength(const SColumnInfoData* pColumnInfoData, int32_t numOfRows) {
   ASSERT(pColumnInfoData != NULL);
   if (IS_VAR_DATA_TYPE(pColumnInfoData->info.type)) {
diff --git a/source/common/src/tname.c b/source/common/src/tname.c
index c5bebf363062b9a9a434da4f220110f9e9db2a6d..b6f49a7219394c2bb1f2a9f3e7901dc5911cb4ae 100644
--- a/source/common/src/tname.c
+++ b/source/common/src/tname.c
@@ -20,34 +20,6 @@
 
 #define VALID_NAME_TYPE(x) ((x) == TSDB_DB_NAME_T || (x) == TSDB_TABLE_NAME_T)
 
-bool tscValidateTableNameLength(size_t len) { return len < TSDB_TABLE_NAME_LEN; }
-
-#if 0
-// TODO refactor
-SColumnFilterInfo* tFilterInfoDup(const SColumnFilterInfo* src, int32_t numOfFilters) {
-  if (numOfFilters == 0 || src == NULL) {
-    assert(src == NULL);
-    return NULL;
-  }
-
-  SColumnFilterInfo* pFilter = taosMemoryCalloc(1, numOfFilters * sizeof(SColumnFilterInfo));
-
-  memcpy(pFilter, src, sizeof(SColumnFilterInfo) * numOfFilters);
-  for (int32_t j = 0; j < numOfFilters; ++j) {
-    if (pFilter[j].filterstr) {
-      size_t len = (size_t) pFilter[j].len + 1 * TSDB_NCHAR_SIZE;
-      pFilter[j].pz = (int64_t) taosMemoryCalloc(1, len);
-
-      memcpy((char*)pFilter[j].pz, (char*)src[j].pz, (size_t) pFilter[j].len);
-    }
-  }
-
-  assert(src->filterstr == 0 || src->filterstr == 1);
-  assert(!(src->lowerRelOptr == 0 && src->upperRelOptr == 0));
-
-  return pFilter;
-}
-#endif
 #if 0
 int64_t taosGetIntervalStartTimestamp(int64_t startTime, int64_t slidingTime, int64_t intervalTime, char timeUnit, int16_t precision) {
   if (slidingTime == 0) {
diff --git a/source/libs/executor/inc/executorimpl.h b/source/libs/executor/inc/executorimpl.h
index 10b84ba7b17bcdacf8a944d4a6dd1d7c9ffc982e..a70e7cd1dd23b31b79376eeb65f9486f5502239b 100644
--- a/source/libs/executor/inc/executorimpl.h
+++ b/source/libs/executor/inc/executorimpl.h
@@ -855,7 +855,6 @@ void    doApplyFunctions(SExecTaskInfo* taskInfo, SqlFunctionCtx* pCtx, STimeWin
 int32_t extractDataBlockFromFetchRsp(SSDataBlock* pRes, SLoadRemoteDataInfo* pLoadInfo, int32_t numOfRows, char* pData,
                                   int32_t compLen, int32_t numOfOutput, int64_t startTs, uint64_t* total,
                                   SArray* pColList);
-STimeWindow getAlignQueryTimeWindow(SInterval* pInterval, int32_t precision, int64_t key);
 STimeWindow getFirstQualifiedTimeWindow(int64_t ts, STimeWindow* pWindow, SInterval* pInterval, int32_t order);
 
 int32_t getTableScanInfo(SOperatorInfo* pOperator, int32_t *order, int32_t* scanFlag);
@@ -986,9 +985,8 @@ int32_t decodeOperator(SOperatorInfo* ops, const char* data, int32_t length);
 void    setTaskStatus(SExecTaskInfo* pTaskInfo, int8_t status);
 int32_t createExecTaskInfoImpl(SSubplan* pPlan, SExecTaskInfo** pTaskInfo, SReadHandle* pHandle, uint64_t taskId,
                                const char* sql, EOPTR_EXEC_MODEL model);
-int32_t createDataSinkParam(SDataSinkNode *pNode, void **pParam, qTaskInfo_t* pTaskInfo, SReadHandle* readHandle);                               
-int32_t getOperatorExplainExecInfo(SOperatorInfo* operatorInfo, SExplainExecInfo** pRes, int32_t* capacity,
-                                   int32_t* resNum);
+int32_t createDataSinkParam(SDataSinkNode *pNode, void **pParam, qTaskInfo_t* pTaskInfo, SReadHandle* readHandle);
+int32_t getOperatorExplainExecInfo(SOperatorInfo* operatorInfo, SArray* pExecInfoList);
 
 int32_t aggDecodeResultRow(SOperatorInfo* pOperator, char* result);
 int32_t aggEncodeResultRow(SOperatorInfo* pOperator, char** result, int32_t* length);
diff --git a/source/libs/executor/src/executor.c b/source/libs/executor/src/executor.c
index a7d13da52bbe258e8d662aa1402e3276726fca43..8f3ecafbea1e9574d718a521c190c811cff02419 100644
--- a/source/libs/executor/src/executor.c
+++ b/source/libs/executor/src/executor.c
@@ -496,11 +496,9 @@ void qDestroyTask(qTaskInfo_t qTaskHandle) {
   doDestroyTask(pTaskInfo);
 }
 
-int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, int32_t* resNum, SExplainExecInfo** pRes) {
+int32_t qGetExplainExecInfo(qTaskInfo_t tinfo, SArray* pExecInfoList) {
   SExecTaskInfo* pTaskInfo = (SExecTaskInfo*)tinfo;
-  int32_t        capacity = 0;
-
-  return getOperatorExplainExecInfo(pTaskInfo->pRoot, pRes, &capacity, resNum);
+  return getOperatorExplainExecInfo(pTaskInfo->pRoot, pExecInfoList);
 }
 
 int32_t qSerializeTaskStatus(qTaskInfo_t tinfo, char** pOutput, int32_t* len) {
diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 022089e06ac85e1660cba35bc749ef2a89a4eb7f..084fbbea7cfafa7b7d0be5fb3fa0a19af640c69d 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -4613,42 +4613,29 @@ void releaseQueryBuf(size_t numOfTables) {
   atomic_add_fetch_64(&tsQueryBufferSizeBytes, t);
 }
 
-int32_t getOperatorExplainExecInfo(SOperatorInfo* operatorInfo, SExplainExecInfo** pRes, int32_t* capacity,
-                                   int32_t* resNum) {
-  if (*resNum >= *capacity) {
-    *capacity += 10;
-
-    *pRes = taosMemoryRealloc(*pRes, (*capacity) * sizeof(SExplainExecInfo));
-    if (NULL == *pRes) {
-      qError("malloc %d failed", (*capacity) * (int32_t)sizeof(SExplainExecInfo));
-      return TSDB_CODE_QRY_OUT_OF_MEMORY;
-    }
-  }
-
-  SExplainExecInfo* pInfo = &(*pRes)[*resNum];
+int32_t getOperatorExplainExecInfo(SOperatorInfo* operatorInfo, SArray* pExecInfoList) {
+  SExplainExecInfo execInfo = {0};
+  SExplainExecInfo* pExplainInfo = taosArrayPush(pExecInfoList, &execInfo);
 
-  pInfo->numOfRows = operatorInfo->resultInfo.totalRows;
-  pInfo->startupCost = operatorInfo->cost.openCost;
-  pInfo->totalCost = operatorInfo->cost.totalCost;
+  pExplainInfo->numOfRows = operatorInfo->resultInfo.totalRows;
+  pExplainInfo->startupCost = operatorInfo->cost.openCost;
+  pExplainInfo->totalCost = operatorInfo->cost.totalCost;
+  pExplainInfo->verboseLen = 0;
+  pExplainInfo->verboseInfo = NULL;
 
   if (operatorInfo->fpSet.getExplainFn) {
-    int32_t code = operatorInfo->fpSet.getExplainFn(operatorInfo, &pInfo->verboseInfo, &pInfo->verboseLen);
+    int32_t code = operatorInfo->fpSet.getExplainFn(operatorInfo, &pExplainInfo->verboseInfo, &pExplainInfo->verboseLen);
     if (code) {
       qError("%s operator getExplainFn failed, code:%s", GET_TASKID(operatorInfo->pTaskInfo), tstrerror(code));
       return code;
     }
-  } else {
-    pInfo->verboseLen = 0;
-    pInfo->verboseInfo = NULL;
   }
 
-  ++(*resNum);
-
   int32_t code = 0;
   for (int32_t i = 0; i < operatorInfo->numOfDownstream; ++i) {
-    code = getOperatorExplainExecInfo(operatorInfo->pDownstream[i], pRes, capacity, resNum);
-    if (code) {
-      taosMemoryFreeClear(*pRes);
+    code = getOperatorExplainExecInfo(operatorInfo->pDownstream[i], pExecInfoList);
+    if (code != TSDB_CODE_SUCCESS) {
+//      taosMemoryFreeClear(*pRes);
       return TSDB_CODE_QRY_OUT_OF_MEMORY;
     }
   }
diff --git a/source/libs/executor/src/groupoperator.c b/source/libs/executor/src/groupoperator.c
index 5c37cf01e8d29db4453b5e177ec0dabe79f4ac4a..5690389302c46a520ca76f8ce15020ff9175c1f5 100644
--- a/source/libs/executor/src/groupoperator.c
+++ b/source/libs/executor/src/groupoperator.c
@@ -31,14 +31,21 @@ static int32_t* setupColumnOffset(const SSDataBlock* pBlock, int32_t rowCapacity
 static int32_t  setGroupResultOutputBuf(SOperatorInfo* pOperator, SOptrBasicInfo* binfo, int32_t numOfCols, char* pData, int16_t bytes,
                                         uint64_t groupId, SDiskbasedBuf* pBuf, SAggSupporter* pAggSup);
 
+static void freeGroupKey(void* param) {
+  SGroupKeys* pKey = (SGroupKeys*) param;
+  taosMemoryFree(pKey->pData);
+}
+
 static void destroyGroupOperatorInfo(void* param, int32_t numOfOutput) {
   SGroupbyOperatorInfo* pInfo = (SGroupbyOperatorInfo*)param;
   cleanupBasicInfo(&pInfo->binfo);
   taosMemoryFreeClear(pInfo->keyBuf);
   taosArrayDestroy(pInfo->pGroupCols);
-  taosArrayDestroy(pInfo->pGroupColVals);
+  taosArrayDestroyEx(pInfo->pGroupColVals, freeGroupKey);
   cleanupExprSupp(&pInfo->scalarSup);
-  
+
+  cleanupGroupResInfo(&pInfo->groupResInfo);
+  cleanupAggSup(&pInfo->aggSup);
   taosMemoryFreeClear(param);
 }
 
@@ -414,8 +421,6 @@ SOperatorInfo* createGroupOperatorInfo(SOperatorInfo* downstream, SExprInfo* pEx
   pOperator->blocking     = true;
   pOperator->status       = OP_NOT_OPENED;
   // pOperator->operatorType = OP_Groupby;
-  pOperator->exprSupp.pExprInfo    = pExprInfo;
-  pOperator->exprSupp.numOfExprs   = numOfCols;
   pOperator->info         = pInfo;
   pOperator->pTaskInfo    = pTaskInfo;
 
diff --git a/source/libs/qworker/inc/qwMsg.h b/source/libs/qworker/inc/qwMsg.h
index 53789343433289e10c52c207e3ce9ca7bd6ef0bb..3ee870ef96235c1be598c600ccce0e51b4f97b21 100644
--- a/source/libs/qworker/inc/qwMsg.h
+++ b/source/libs/qworker/inc/qwMsg.h
@@ -39,7 +39,7 @@ int32_t qwBuildAndSendFetchRsp(int32_t rspType, SRpcHandleInfo *pConn, SRetrieve
 void    qwBuildFetchRsp(void *msg, SOutputData *input, int32_t len, bool qComplete);
 int32_t qwBuildAndSendCQueryMsg(QW_FPARAMS_DEF, SRpcHandleInfo *pConn);
 int32_t qwBuildAndSendQueryRsp(int32_t rspType, SRpcHandleInfo *pConn, int32_t code, SQWTaskCtx *ctx);
-int32_t qwBuildAndSendExplainRsp(SRpcHandleInfo *pConn, SExplainExecInfo *execInfo, int32_t num);
+int32_t qwBuildAndSendExplainRsp(SRpcHandleInfo *pConn, SArray* pExecList);
 int32_t qwBuildAndSendErrorRsp(int32_t rspType, SRpcHandleInfo *pConn, int32_t code);
 void    qwFreeFetchRsp(void *msg);
 int32_t qwMallocFetchRsp(int32_t length, SRetrieveTableRsp **rsp);
diff --git a/source/libs/qworker/src/qwMsg.c b/source/libs/qworker/src/qwMsg.c
index 7901fa64cb2c2ce198cc9996edfbc0eecb3e1cce..e8ffd98153a2e7ac32e4e7500cb0e1a5d14da0e4 100644
--- a/source/libs/qworker/src/qwMsg.c
+++ b/source/libs/qworker/src/qwMsg.c
@@ -82,8 +82,9 @@ int32_t qwBuildAndSendQueryRsp(int32_t rspType, SRpcHandleInfo *pConn, int32_t c
   return TSDB_CODE_SUCCESS;
 }
 
-int32_t qwBuildAndSendExplainRsp(SRpcHandleInfo *pConn, SExplainExecInfo *execInfo, int32_t num) {
-  SExplainRsp rsp = {.numOfPlans = num, .subplanInfo = execInfo};
+int32_t qwBuildAndSendExplainRsp(SRpcHandleInfo *pConn, SArray* pExecList) {
+  SExplainExecInfo* pInfo = taosArrayGet(pExecList, 0);
+  SExplainRsp rsp = {.numOfPlans = taosArrayGetSize(pExecList), .subplanInfo = pInfo};
 
   int32_t contLen = tSerializeSExplainRsp(NULL, 0, &rsp);
   void *  pRsp = rpcMallocCont(contLen);
@@ -96,10 +97,9 @@ int32_t qwBuildAndSendExplainRsp(SRpcHandleInfo *pConn, SExplainExecInfo *execIn
       .code = 0,
       .info = *pConn,
   };
-  rpcRsp.info.ahandle = NULL;
 
+  rpcRsp.info.ahandle = NULL;
   tmsgSendRsp(&rpcRsp);
-
   return TSDB_CODE_SUCCESS;
 }
 
diff --git a/source/libs/qworker/src/qworker.c b/source/libs/qworker/src/qworker.c
index d1f8a50dab556067dbc2bfa143a75c8ee2dda9c2..36d85f1f123cc8864d8678d07f174308a38ba729 100644
--- a/source/libs/qworker/src/qworker.c
+++ b/source/libs/qworker/src/qworker.c
@@ -44,18 +44,24 @@ int32_t qwProcessHbLinkBroken(SQWorker *mgmt, SQWMsg *qwMsg, SSchedulerHbReq *re
   QW_RET(TSDB_CODE_SUCCESS);
 }
 
+static void freeItem(void* param) {
+  SExplainExecInfo* pInfo = param;
+  taosMemoryFree(pInfo->verboseInfo);
+}
+
 int32_t qwHandleTaskComplete(QW_FPARAMS_DEF, SQWTaskCtx *ctx) {
   qTaskInfo_t taskHandle = ctx->taskHandle;
 
   if (TASK_TYPE_TEMP == ctx->taskType && taskHandle) {
     if (ctx->explain) {
-      SExplainExecInfo *execInfo = NULL;
-      int32_t           resNum = 0;
-      QW_ERR_RET(qGetExplainExecInfo(taskHandle, &resNum, &execInfo));
+      SArray* execInfoList = taosArrayInit(4, sizeof(SExplainExecInfo));
+      QW_ERR_RET(qGetExplainExecInfo(taskHandle, execInfoList));
 
       SRpcHandleInfo connInfo = ctx->ctrlConnInfo;
       connInfo.ahandle = NULL;
-      QW_ERR_RET(qwBuildAndSendExplainRsp(&connInfo, execInfo, resNum));
+      int32_t code = qwBuildAndSendExplainRsp(&connInfo, execInfoList);
+      taosArrayDestroyEx(execInfoList, freeItem);
+      QW_ERR_RET(code);
     }
 
     if (!ctx->needFetch) {