diff --git a/src/client/inc/tscUtil.h b/src/client/inc/tscUtil.h
index de69e23b9bb7671a6865d9360bf414865fee87c5..ca1ea54e16573cd18ff18321836515cdf6425781 100644
--- a/src/client/inc/tscUtil.h
+++ b/src/client/inc/tscUtil.h
@@ -327,7 +327,7 @@ STableMeta* tscTableMetaDup(STableMeta* pTableMeta);
 int32_t tscCreateQueryFromQueryInfo(SQueryInfo* pQueryInfo, SQueryAttr* pQueryAttr, void* addr);
 
 void tsCreateSQLFunctionCtx(SQueryInfo* pQueryInfo, SQLFunctionCtx* pCtx, SSchema* pSchema);
-void* createQueryInfoFromQueryNode(SQueryInfo* pQueryInfo, SExprInfo* pExprs, STableGroupInfo* pTableGroupInfo, SOperatorInfo* pOperator, char* sql, void* addr, int32_t stage);
+void* createQInfoFromQueryNode(SQueryInfo* pQueryInfo, SExprInfo* pExprs, STableGroupInfo* pTableGroupInfo, SOperatorInfo* pOperator, char* sql, void* addr, int32_t stage);
 
 void* malloc_throw(size_t size);
 void* calloc_throw(size_t nmemb, size_t size);
diff --git a/src/client/inc/tsclient.h b/src/client/inc/tsclient.h
index 87da9c8b002c018f6a6e281d0aae4e7f48cb1c90..875b485cf2fcca33bc9a062ee54e6368f62db81a 100644
--- a/src/client/inc/tsclient.h
+++ b/src/client/inc/tsclient.h
@@ -454,7 +454,7 @@ int32_t tscCreateResPointerInfo(SSqlRes *pRes, SQueryInfo *pQueryInfo);
 void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo);
 void tscSetResRawPtrRv(SSqlRes* pRes, SQueryInfo* pQueryInfo, SSDataBlock* pBlock);
 
-void handleDownstreamOperator(SSqlRes* pRes, SQueryInfo* pQueryInfo, SSqlRes* pOutput);
+void handleDownstreamOperator(SSqlRes** pRes, int32_t numOfUpstream, SQueryInfo* px, SSqlRes* pOutput);
 void destroyTableNameList(SSqlCmd* pCmd);
 
 void tscResetSqlCmd(SSqlCmd *pCmd, bool removeMeta);
diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index c179ed1ec61b009c59438b6facbcda2a1c4f62cc..365ff4147a74706b4f8a57f416564f9c46cfd2d4 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -7192,7 +7192,9 @@ int32_t loadAllTableMeta(SSqlObj* pSql, struct SSqlInfo* pInfo) {
 
       STableMeta* pMeta = tscTableMetaDup(pTableMeta);
       STableMetaVgroupInfo p = {.pTableMeta = pMeta,};
-      taosHashPut(pCmd->pTableMetaMap, name, strlen(name), &p, sizeof(STableMetaVgroupInfo));
+
+      const char* px = tNameGetTableName(pname);
+      taosHashPut(pCmd->pTableMetaMap, px, strlen(px), &p, sizeof(STableMetaVgroupInfo));
     } else {// add to the retrieve table meta array list.
       char* t = strdup(name);
       taosArrayPush(plist, &t);
diff --git a/src/client/src/tscServer.c b/src/client/src/tscServer.c
index 08085d7216298a5a922a4ce5890300cc82ef64fa..f35be615a4107a020ff7d432fca588b87418b0a2 100644
--- a/src/client/src/tscServer.c
+++ b/src/client/src/tscServer.c
@@ -1637,7 +1637,7 @@ int tscProcessRetrieveLocalMergeRsp(SSqlObj *pSql) {
       list[i] = *pExprInfo;
     }
 
-    pQueryInfo->pQInfo = createQueryInfoFromQueryNode(pQueryInfo, list, &tableGroupInfo, NULL, NULL, pRes->pLocalMerger, MERGE_STAGE);
+    pQueryInfo->pQInfo = createQInfoFromQueryNode(pQueryInfo, list, &tableGroupInfo, NULL, NULL, pRes->pLocalMerger, MERGE_STAGE);
   }
 
   uint64_t localQueryId = 0;
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index 90bc5c985f57aa74a7cbfe00f48a14e1dfa64310..406214aba0edb9679214a03ce062a17d9197504b 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -3483,10 +3483,11 @@ static UNUSED_FUNC bool tscHasRemainDataInSubqueryResultSet(SSqlObj *pSql) {
   return hasData;
 }
 
-void* createQueryInfoFromQueryNode(SQueryInfo* pQueryInfo, SExprInfo* pExprs, STableGroupInfo* pTableGroupInfo,
-                                   SOperatorInfo* pSourceOperator, char* sql, void* merger, int32_t stage) {
+// todo remove pExprs
+void* createQInfoFromQueryNode(SQueryInfo* pQueryInfo, SExprInfo* pExprs, STableGroupInfo* pTableGroupInfo,
+                               SOperatorInfo* pSourceOperator, char* sql, void* merger, int32_t stage) {
   assert(pQueryInfo != NULL);
-  int16_t numOfOutput = pQueryInfo->fieldsInfo.numOfOutput;
+//  int16_t numOfOutput = pQueryInfo->fieldsInfo.numOfOutput;
 
   SQInfo *pQInfo = (SQInfo *)calloc(1, sizeof(SQInfo));
   if (pQInfo == NULL) {
@@ -3505,13 +3506,25 @@ void* createQueryInfoFromQueryNode(SQueryInfo* pQueryInfo, SExprInfo* pExprs, ST
   pQueryAttr->tableGroupInfo = *pTableGroupInfo;
 
   // calculate the result row size
-  for (int16_t col = 0; col < numOfOutput; ++col) {
-    assert(pExprs[col].base.resBytes > 0);
-    pQueryAttr->resultRowSize += pExprs[col].base.resBytes;
+  SExprInfo* pei = NULL;
+  int32_t num = 0;
+  if (pQueryAttr->pExpr3 != NULL) {
+    pei = pQueryAttr->pExpr3;
+    num = pQueryAttr->numOfExpr3;
+  } else if (pQueryAttr->pExpr2 != NULL) {
+    pei = pQueryAttr->pExpr2;
+    num = pQueryAttr->numOfExpr2;
+  } else {
+    pei = pQueryAttr->pExpr1;
+    num = pQueryAttr->numOfOutput;
+  }
+
+  for (int16_t col = 0; col < num; ++col) {
+    pQueryAttr->resultRowSize += pei[col].base.resBytes;
 
     // keep the tag length
-    if (TSDB_COL_IS_TAG(pExprs[col].base.colInfo.flag)) {
-      pQueryAttr->tagLen += pExprs[col].base.resBytes;
+    if (TSDB_COL_IS_TAG(pei[col].base.colInfo.flag)) {
+      pQueryAttr->tagLen += pei[col].base.resBytes;
     }
   }
 
@@ -3569,15 +3582,15 @@ void* createQueryInfoFromQueryNode(SQueryInfo* pQueryInfo, SExprInfo* pExprs, ST
     }
   }
 
-  for (int32_t i = 0; i < numOfOutput; ++i) {
-    SExprInfo* pExprInfo = &pExprs[i];
-    if (pExprInfo->pExpr != NULL) {
-      tExprTreeDestroy(pExprInfo->pExpr, NULL);
-      pExprInfo->pExpr = NULL;
-    }
-  }
-
-  tfree(pExprs);
+//  for (int32_t i = 0; i < numOfOutput; ++i) {
+//    SExprInfo* pExprInfo = &pExprs[i];
+//    if (pExprInfo->pExpr != NULL) {
+//      tExprTreeDestroy(pExprInfo->pExpr, NULL);
+//      pExprInfo->pExpr = NULL;
+//    }
+//  }
+//
+//  tfree(pExprs);
 
   createFilterInfo(pQueryAttr, 0);
 
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index a35d44bba7befc0de719c1fb4e31cf7951523695..b1a7a340118dc3642fc98c8ce06c96f09d8709cf 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -651,8 +651,16 @@ typedef struct SDummyInputInfo {
   SSqlRes        *pRes;  // refactor: remove it
 } SDummyInputInfo;
 
+typedef struct SJoinStatus {
+  SSDataBlock* pBlock;   // point to the upstream block
+  int32_t      index;
+  bool         completed;// current upstream is completed or not
+} SJoinStatus;
+
 typedef struct SJoinOperatorInfo {
-  int32_t a;
+  SSDataBlock *pRes;
+  SJoinStatus *status;
+  int32_t      numOfUpstream;
 } SJoinOperatorInfo;
 
 SSDataBlock* doGetDataBlock(void* param, bool* newgroup) {
@@ -685,6 +693,64 @@ SSDataBlock* doGetDataBlock(void* param, bool* newgroup) {
   return pBlock;
 }
 
+SSDataBlock* doBlockJoin(void* param, bool* newgroup) {
+  SOperatorInfo *pOperator = (SOperatorInfo*) param;
+  assert(pOperator->numOfUpstream > 1);
+
+  SSDataBlock* block0 = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
+  SSDataBlock* block1 = pOperator->upstream[1]->exec(pOperator->upstream[1], newgroup);
+
+  if (block1 == NULL || block0 == NULL) {
+    return NULL;
+  }
+
+  assert(block0 != block1);
+
+  SJoinOperatorInfo* pJoinInfo = pOperator->info;
+  pJoinInfo->status[0].pBlock = block0;
+  pJoinInfo->status[1].pBlock = block1;
+
+  SJoinStatus* st0 = &pJoinInfo->status[0];
+  SJoinStatus* st1 = &pJoinInfo->status[1];
+
+  while (st0->index < st0->pBlock->info.rows && st1->index < st1->pBlock->info.rows) {
+    SColumnInfoData* p0 = taosArrayGet(st0->pBlock->pDataBlock, 0);
+    SColumnInfoData* p1 = taosArrayGet(st1->pBlock->pDataBlock, 0);
+
+    int64_t* ts0 = (int64_t*) p0->pData;
+    int64_t* ts1 = (int64_t*) p1->pData;
+    if (ts0[st0->index] == ts1[st1->index]) { // add to the final result buffer
+      // check if current output buffer is over the threshold to pause current loop
+      int32_t rows = pJoinInfo->pRes->info.rows;
+      for(int32_t j = 0; j < st0->pBlock->info.numOfCols; ++j) {
+        SColumnInfoData* pCol1 = taosArrayGet(pJoinInfo->pRes->pDataBlock, j);
+        SColumnInfoData* pSrc = taosArrayGet(st0->pBlock->pDataBlock, j);
+
+        int32_t bytes = pSrc->info.bytes;
+        memcpy(pCol1->pData + rows * bytes, pSrc->pData + st0->index * bytes, bytes);
+      }
+
+      for(int32_t j = 0; j < st1->pBlock->info.numOfCols; ++j) {
+        SColumnInfoData* pCol1 = taosArrayGet(pJoinInfo->pRes->pDataBlock, j + st0->pBlock->info.numOfCols);
+        SColumnInfoData* pSrc = taosArrayGet(st1->pBlock->pDataBlock, j);
+
+        int32_t bytes = pSrc->info.bytes;
+        memcpy(pCol1->pData + rows * bytes, pSrc->pData + st1->index * bytes, bytes);
+      }
+
+      st0->index++;
+      st1->index++;
+      pJoinInfo->pRes->info.rows++;
+    } else if (ts0[st0->index] < ts1[st1->index]) {
+      st0->index++;
+    } else {
+      st1->index++;
+    }
+  }
+
+  return pJoinInfo->pRes;
+}
+
 static void destroyDummyInputOperator(void* param, int32_t numOfOutput) {
   SDummyInputInfo* pInfo = (SDummyInputInfo*) param;
 
@@ -728,34 +794,36 @@ SOperatorInfo* createDummyInputOperator(char* pResult, SSchema* pSchema, int32_t
   return pOptr;
 }
 
-SOperatorInfo* createJoinOperator(SOperatorInfo** pUpstream, int32_t numOfUpstream, SExprInfo* pExprInfo, int32_t numOfOutput) {
-  SJoinInfo* pInfo = calloc(1, sizeof(SJoinInfo));
-/*
-  pInfo->pRes  = (SSqlRes*) pResult;
-  pInfo->block = calloc(numOfCols, sizeof(SSDataBlock));
-  pInfo->block->info.numOfCols = numOfCols;
+SOperatorInfo* createJoinOperator(SOperatorInfo** pUpstream, int32_t numOfUpstream, SSchema* pSchema, int32_t numOfOutput) {
+  SJoinOperatorInfo* pInfo = calloc(1, sizeof(SJoinOperatorInfo));
+  pInfo->numOfUpstream = numOfUpstream;
+  pInfo->status = calloc(numOfUpstream, sizeof(SJoinStatus));
 
-  pInfo->block->pDataBlock = taosArrayInit(numOfCols, sizeof(SColumnInfoData));
-  for(int32_t i = 0; i < numOfCols; ++i) {
+  pInfo->pRes = calloc(1, sizeof(SSDataBlock));
+  pInfo->pRes->info.numOfCols = numOfOutput;
+
+  pInfo->pRes->pDataBlock = taosArrayInit(numOfOutput, sizeof(SColumnInfoData));
+  for(int32_t i = 0; i < numOfOutput; ++i) {
     SColumnInfoData colData = {{0}};
     colData.info.bytes = pSchema[i].bytes;
     colData.info.type  = pSchema[i].type;
     colData.info.colId = pSchema[i].colId;
+    colData.pData = calloc(1, colData.info.bytes * 4096);
 
-    taosArrayPush(pInfo->block->pDataBlock, &colData);
+    taosArrayPush(pInfo->pRes->pDataBlock, &colData);
   }
-*/
+
   SOperatorInfo* pOptr = calloc(1, sizeof(SOperatorInfo));
   pOptr->name          = "JoinOperator";
   pOptr->operatorType  = OP_Join;
   pOptr->numOfOutput   = numOfOutput;
   pOptr->blockingOptr  = false;
   pOptr->info          = pInfo;
-  pOptr->exec          = doGetDataBlock;
+  pOptr->exec          = doBlockJoin;
   pOptr->cleanup       = destroyDummyInputOperator;
 
   for(int32_t i = 0; i < numOfUpstream; ++i) {
-    appendUpstream(pOptr, pUpstream[0]);
+    appendUpstream(pOptr, pUpstream[i]);
   }
 
   return pOptr;
@@ -775,7 +843,7 @@ void convertQueryResult(SSqlRes* pRes, SQueryInfo* pQueryInfo) {
   pRes->completed = (pRes->numOfRows == 0);
 }
 
-void handleDownstreamOperator(SSqlRes* pRes, SQueryInfo* px, SSqlRes* pOutput) {
+void handleDownstreamOperator(SSqlRes** pRes, int32_t numOfUpstream, SQueryInfo* px, SSqlRes* pOutput) {
   // handle the following query process
   if (px->pQInfo == NULL) {
     SColumnInfo* pColumnInfo = extractColumnInfoFromResult(px->colList);
@@ -805,15 +873,44 @@ void handleDownstreamOperator(SSqlRes* pRes, SQueryInfo* px, SSqlRes* pOutput) {
     taosArrayPush(tableGroupInfo.pGroupList, &group);
 
     // if it is a join query, create join operator here
-    SOperatorInfo* pSourceOperator = createDummyInputOperator((char*)pRes, pSchema, numOfCols);
+    int32_t numOfCol1 = px->pTableMetaInfo[0]->pTableMeta->tableInfo.numOfColumns;
+
+    SOperatorInfo* pSourceOperator = createDummyInputOperator((char*)pRes[0], pSchema, numOfCol1);
+
+    SSchema* schema = NULL;
     if (px->numOfTables > 1) {
+      SOperatorInfo* p[2] = {0};
+      p[0] = pSourceOperator;
+
+      SSchema* pSchema1 = tscGetTableSchema(px->pTableMetaInfo[1]->pTableMeta);
+      numOfCol1 = px->pTableMetaInfo[1]->pTableMeta->tableInfo.numOfColumns;
+
+      SOperatorInfo* pSourceOperator1 = createDummyInputOperator((char*)pRes[1], pSchema1, numOfCol1);
+      p[1] = pSourceOperator1;
+
+      int32_t num = pSourceOperator->numOfOutput + pSourceOperator1->numOfOutput;
+      schema = calloc(num, sizeof(SSchema));
+
+      memcpy(&schema[0], pSchema, pSourceOperator->numOfOutput * sizeof(SSchema));
 
-      pSourceOperator = createJoinOperator(&pSourceOperator, 1, NULL, pSourceOperator->numOfOutput);
+      memcpy(&schema[pSourceOperator->numOfOutput], pSchema1, pSourceOperator1->numOfOutput * sizeof(SSchema));
+      pSourceOperator = createJoinOperator(p, px->numOfTables, schema, num);
     }
 
     SExprInfo* exprInfo = NULL;
     /*int32_t code = */ createQueryFunc(&info, numOfOutput, &exprInfo, px->exprList->pData, NULL, px->type, NULL);
-    px->pQInfo = createQueryInfoFromQueryNode(px, exprInfo, &tableGroupInfo, pSourceOperator, NULL, NULL, MASTER_SCAN);
+    for(int32_t i = 0; i < numOfOutput; ++i) {
+      SExprInfo* pex = taosArrayGetP(px->exprList, i);
+      int32_t colId = pex->base.colInfo.colId;
+      for(int32_t j = 0; j < pSourceOperator->numOfOutput; ++j) {
+        if (colId == schema[j].colId) {
+          pex->base.colInfo.colIndex = j;
+          break;
+        }
+      }
+    }
+
+    px->pQInfo = createQInfoFromQueryNode(px, exprInfo, &tableGroupInfo, pSourceOperator, NULL, NULL, MASTER_SCAN);
     tfree(pColumnInfo);
   }
 
@@ -3011,11 +3108,10 @@ static void doRetrieveSubqueryData(SSchedMsg *pMsg) {
 
   if (numOfRows > 0) {
     SQueryInfo *pQueryInfo = tscGetQueryInfo(&pSql->cmd);
-    SSqlObj    *pSub = pSql->pSubs[0];
-    handleDownstreamOperator(&pSub->res, pQueryInfo, &pSql->res);
+    SSqlRes* list[2] = {&pSql->pSubs[0]->res, &pSql->pSubs[1]->res};
+    handleDownstreamOperator(list, 2, pQueryInfo, &pSql->res);
   }
 
-//  int32_t code = pSql->res.code;
   pSql->res.qId = -1;
   if (pSql->res.code == TSDB_CODE_SUCCESS) {
     (*pSql->fp)(pSql->param, pSql, pSql->res.numOfRows);
diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index 8e22b4e20814d0d1303183378404f53a1e51c204..a39819cb5124cca46f3cd0a7ac6d9eace716fbe5 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -521,7 +521,7 @@ SOperatorInfo* createSLimitOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperator
 SOperatorInfo* createFilterOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream, SExprInfo* pExpr,
                                         int32_t numOfOutput, SColumnInfo* pCols, int32_t numOfFilter);
 
-SOperatorInfo* createJoinOperator(SOperatorInfo** pUpstream, int32_t numOfUpstream, SExprInfo* pExprInfo, int32_t numOfOutput);
+SOperatorInfo* createJoinOperator(SOperatorInfo** pUpstream, int32_t numOfUpstream, SSchema* pSchema, int32_t numOfOutput);
 
 SSDataBlock* doGlobalAggregate(void* param, bool* newgroup);
 SSDataBlock* doMultiwayMergeSort(void* param, bool* newgroup);
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 5035e9cbd7f6c272c707249f74c7f6cbdd50fbcd..6c92293bfd4632d30ca7c236da8f5b44cb611d0f 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -1750,7 +1750,7 @@ static int32_t setupQueryRuntimeEnv(SQueryRuntimeEnv *pRuntimeEnv, int32_t numOf
         SOperatorInfo* prev = pRuntimeEnv->proot;
         if (i == 0) {
           pRuntimeEnv->proot = createArithOperatorInfo(pRuntimeEnv, prev, pQueryAttr->pExpr1, pQueryAttr->numOfOutput);
-          if (pRuntimeEnv->proot != NULL && prev->operatorType != OP_DummyInput) {  // TODO refactor
+          if (pRuntimeEnv->proot != NULL && prev->operatorType != OP_DummyInput && prev->operatorType != OP_Join) {  // TODO refactor
             setTableScanFilterOperatorInfo(prev->info, pRuntimeEnv->proot);
           }
         } else {
@@ -3929,11 +3929,11 @@ void queryCostStatis(SQInfo *pQInfo) {
 
 void appendUpstream(SOperatorInfo* p, SOperatorInfo* pUpstream) {
   if (p->upstream == NULL) {
-    assert(p->numOfOutput == 0);
+    assert(p->numOfUpstream == 0);
   }
 
-  p->upstream = realloc(p->upstream, POINTER_BYTES * (p->numOfOutput + 1));
-  p->upstream[p->numOfOutput++] = pUpstream;
+  p->upstream = realloc(p->upstream, POINTER_BYTES * (p->numOfUpstream + 1));
+  p->upstream[p->numOfUpstream++] = pUpstream;
 }
 
 static void doDestroyTableQueryInfo(STableGroupInfo* pTableqinfoGroupInfo);
@@ -4824,7 +4824,7 @@ static SSDataBlock* doArithmeticOperation(void* param, bool* newgroup) {
     bool prevVal = *newgroup;
 
     // The upstream exec may change the value of the newgroup, so use a local variable instead.
-    SSDataBlock* pBlock = pOperator->upstream[0]->exec(pOperator->upstream, newgroup);
+    SSDataBlock* pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
     if (pBlock == NULL) {
       assert(*newgroup == false);
 
@@ -4878,7 +4878,7 @@ static SSDataBlock* doLimit(void* param, bool* newgroup) {
 
   SSDataBlock* pBlock = NULL;
   while (1) {
-    pBlock = pOperator->upstream[0]->exec(pOperator->upstream, newgroup);
+    pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
     if (pBlock == NULL) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
@@ -4949,7 +4949,7 @@ static SSDataBlock* doFilter(void* param, bool* newgroup) {
   SQueryRuntimeEnv* pRuntimeEnv = pOperator->pRuntimeEnv;
 
   while (1) {
-    SSDataBlock *pBlock = pOperator->upstream[0]->exec(pOperator->upstream, newgroup);
+    SSDataBlock *pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
     if (pBlock == NULL) {
       break;
     }
@@ -5219,7 +5219,7 @@ static SSDataBlock* doFill(void* param, bool* newgroup) {
   }
 
   while(1) {
-    SSDataBlock* pBlock = pOperator->upstream[0]->exec(pOperator->upstream, newgroup);
+    SSDataBlock* pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
     if (*newgroup) {
       assert(pBlock != NULL);
     }
@@ -5295,7 +5295,15 @@ static void destroyOperatorInfo(SOperatorInfo* pOperator) {
     pOperator->cleanup(pOperator->info, pOperator->numOfOutput);
   }
 
-  destroyOperatorInfo(pOperator->upstream[0]);
+  if (pOperator->upstream != NULL) {
+    for(int32_t i = 0; i < pOperator->numOfUpstream; ++i) {
+      destroyOperatorInfo(pOperator->upstream[i]);
+    }
+
+    tfree(pOperator->upstream);
+    pOperator->numOfUpstream = 0;
+  }
+
   tfree(pOperator->info);
   tfree(pOperator);
 }
@@ -5844,7 +5852,7 @@ static SSDataBlock* hashDistinct(void* param, bool* newgroup) {
   pRes->info.rows = 0;
   SSDataBlock* pBlock = NULL;
   while(1) {
-    pBlock = pOperator->upstream[0]->exec(pOperator->upstream, newgroup);
+    pBlock = pOperator->upstream[0]->exec(pOperator->upstream[0], newgroup);
     if (pBlock == NULL) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
@@ -6458,7 +6466,7 @@ static int32_t updateOutputBufForTopBotQuery(SQueriedTableInfo* pTableInfo, SCol
   return TSDB_CODE_SUCCESS;
 }
 
-// TODO tag length should be passed from client
+// TODO tag length should be passed from client, refactor
 int32_t createQueryFunc(SQueriedTableInfo* pTableInfo, int32_t numOfOutput, SExprInfo** pExprInfo,
                         SSqlExpr** pExprMsg, SColumnInfo* pTagCols, int32_t queryType, void* pMsg) {
   *pExprInfo = NULL;