diff --git a/source/dnode/vnode/src/meta/metaTable.c b/source/dnode/vnode/src/meta/metaTable.c
index fc55c642e5..559469584b 100644
--- a/source/dnode/vnode/src/meta/metaTable.c
+++ b/source/dnode/vnode/src/meta/metaTable.c
@@ -442,7 +442,7 @@ int metaTtlDropTable(SMeta *pMeta, int64_t ttl, SArray *tbUids) {
   if (ret != 0) {
     return ret;
   }
-  if (taosArrayGetSize(tbUids) == 0){
+  if (taosArrayGetSize(tbUids) == 0) {
     return 0;
   }
 
@@ -811,6 +811,9 @@ static int metaUpdateTableTagVal(SMeta *pMeta, int64_t version, SVAlterTbReq *pA
     for (int32_t i = 0; i < pTagSchema->nCols; i++) {
       SSchema *pCol = &pTagSchema->pSchema[i];
       if (iCol == i) {
+        if (pAlterTbReq->isNull) {
+          continue;
+        }
         STagVal val = {0};
         val.type = pCol->type;
         val.cid = pCol->colId;
diff --git a/source/libs/command/inc/commandInt.h b/source/libs/command/inc/commandInt.h
index 7012c889e9..f60c518d73 100644
--- a/source/libs/command/inc/commandInt.h
+++ b/source/libs/command/inc/commandInt.h
@@ -28,6 +28,7 @@ extern "C" {
 //newline area
 #define EXPLAIN_TAG_SCAN_FORMAT "Tag Scan on %s"
 #define EXPLAIN_TBL_SCAN_FORMAT "Table Scan on %s"
+#define EXPLAIN_TBL_MERGE_SCAN_FORMAT "Table Merge Scan on %s"
 #define EXPLAIN_SYSTBL_SCAN_FORMAT "System Table Scan on %s"
 #define EXPLAIN_DISTBLK_SCAN_FORMAT "Block Dist Scan on %s"
 #define EXPLAIN_LASTROW_SCAN_FORMAT "Last Row Scan on %s"
diff --git a/source/libs/command/src/explain.c b/source/libs/command/src/explain.c
index 2e4bccfdd3..9ffdfc2289 100644
--- a/source/libs/command/src/explain.c
+++ b/source/libs/command/src/explain.c
@@ -433,7 +433,9 @@ int32_t qExplainResNodeToRowsImpl(SExplainResNode *pResNode, SExplainCtx *ctx, i
     case QUERY_NODE_PHYSICAL_PLAN_TABLE_MERGE_SCAN:
     case QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN: {
       STableScanPhysiNode *pTblScanNode = (STableScanPhysiNode *)pNode;
-      EXPLAIN_ROW_NEW(level, EXPLAIN_TBL_SCAN_FORMAT, pTblScanNode->scan.tableName.tname);
+      EXPLAIN_ROW_NEW(level,
+                      QUERY_NODE_PHYSICAL_PLAN_TABLE_MERGE_SCAN == pNode->type ? EXPLAIN_TBL_MERGE_SCAN_FORMAT : EXPLAIN_TBL_SCAN_FORMAT,
+                      pTblScanNode->scan.tableName.tname);
       EXPLAIN_ROW_APPEND(EXPLAIN_LEFT_PARENTHESIS_FORMAT);
       if (pResNode->pExecInfo) {
         QRY_ERR_RET(qExplainBufAppendExecInfo(pResNode->pExecInfo, tbuf, &tlen));
diff --git a/source/libs/parser/src/parAstCreater.c b/source/libs/parser/src/parAstCreater.c
index 70f447120f..b237fd2c6e 100644
--- a/source/libs/parser/src/parAstCreater.c
+++ b/source/libs/parser/src/parAstCreater.c
@@ -523,7 +523,7 @@ SNode* createTempTableNode(SAstCreateContext* pCxt, SNode* pSubquery, const STok
   if (NULL != pTableAlias && TK_NK_NIL != pTableAlias->type) {
     COPY_STRING_FORM_ID_TOKEN(tempTable->table.tableAlias, pTableAlias);
   } else {
-    sprintf(tempTable->table.tableAlias, "%p", tempTable);
+    taosRandStr(tempTable->table.tableAlias, 8);
   }
   if (QUERY_NODE_SELECT_STMT == nodeType(pSubquery)) {
     strcpy(((SSelectStmt*)pSubquery)->stmtName, tempTable->table.tableAlias);
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index 5a6bea6024..93fffee956 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -1220,6 +1220,14 @@ static int32_t translateMultiResFunc(STranslateContext* pCxt, SFunctionNode* pFu
   }
   return TSDB_CODE_SUCCESS;
 }
+
+static int32_t getMultiResFuncNum(SNodeList* pParameterList) {
+  if (1 == LIST_LENGTH(pParameterList)) {
+    return isStar(nodesListGetNode(pParameterList, 0)) ? 2 : 1;
+  }
+  return LIST_LENGTH(pParameterList);
+}
+
 static void setFuncClassification(SNode* pCurrStmt, SFunctionNode* pFunc) {
   if (NULL != pCurrStmt && QUERY_NODE_SELECT_STMT == nodeType(pCurrStmt)) {
     SSelectStmt* pSelect = (SSelectStmt*)pCurrStmt;
@@ -1229,7 +1237,9 @@ static void setFuncClassification(SNode* pCurrStmt, SFunctionNode* pFunc) {
     pSelect->hasMultiRowsFunc = pSelect->hasMultiRowsFunc ? true : fmIsMultiRowsFunc(pFunc->funcId);
     if (fmIsSelectFunc(pFunc->funcId)) {
       pSelect->hasSelectFunc = true;
-      ++(pSelect->selectFuncNum);
+      pSelect->selectFuncNum += (fmIsMultiResFunc(pFunc->funcId) && !fmIsLastRowFunc(pFunc->funcId))
+                                    ? getMultiResFuncNum(pFunc->pParameterList)
+                                    : 1;
     } else if (fmIsVectorFunc(pFunc->funcId)) {
       pSelect->hasOtherVectorFunc = true;
     }
@@ -2134,6 +2144,15 @@ static int32_t translateOrderBy(STranslateContext* pCxt, SSelectStmt* pSelect) {
   return code;
 }
 
+static int32_t translateFillValues(STranslateContext* pCxt, SSelectStmt* pSelect) {
+  if (NULL == pSelect->pWindow || QUERY_NODE_INTERVAL_WINDOW != nodeType(pSelect->pWindow) ||
+      NULL == ((SIntervalWindowNode*)pSelect->pWindow)->pFill) {
+    return TSDB_CODE_SUCCESS;
+  }
+  SFillNode* pFill = (SFillNode*)((SIntervalWindowNode*)pSelect->pWindow)->pFill;
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t translateSelectList(STranslateContext* pCxt, SSelectStmt* pSelect) {
   pCxt->currClause = SQL_CLAUSE_SELECT;
   int32_t code = translateExprList(pCxt, pSelect->pProjectionList);
@@ -2143,6 +2162,9 @@ static int32_t translateSelectList(STranslateContext* pCxt, SSelectStmt* pSelect
   if (TSDB_CODE_SUCCESS == code) {
     code = checkExprListForGroupBy(pCxt, pSelect, pSelect->pProjectionList);
   }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = translateFillValues(pCxt, pSelect);
+  }
   return code;
 }
 
@@ -6053,7 +6075,7 @@ static int32_t buildUpdateTagValReq(STranslateContext* pCxt, SAlterTableStmt* pS
     pReq->pTagVal = (uint8_t*)pTag;
     pStmt->pVal->datum.p = (char*)pTag;  // for free
   } else {
-    pReq->isNull = (TSDB_DATA_TYPE_NULL == pStmt->pVal->node.resType.type);
+    pReq->isNull = pStmt->pVal->isNull;
     pReq->nTagVal = pStmt->pVal->node.resType.bytes;
     pReq->pTagVal = nodesGetValueFromNode(pStmt->pVal);
 
diff --git a/source/libs/planner/src/planLogicCreater.c b/source/libs/planner/src/planLogicCreater.c
index 6a30f32f2b..84e712b466 100644
--- a/source/libs/planner/src/planLogicCreater.c
+++ b/source/libs/planner/src/planLogicCreater.c
@@ -713,7 +713,7 @@ static int32_t createWindowLogicNodeByInterval(SLogicPlanContext* pCxt, SInterva
       (NULL != pInterval->pSliding ? ((SValueNode*)pInterval->pSliding)->unit : pWindow->intervalUnit);
   pWindow->windowAlgo = pCxt->pPlanCxt->streamQuery ? INTERVAL_ALGO_STREAM_SINGLE : INTERVAL_ALGO_HASH;
   pWindow->node.groupAction = GROUP_ACTION_KEEP;
-  pWindow->node.requireDataOrder = DATA_ORDER_LEVEL_IN_BLOCK;
+  pWindow->node.requireDataOrder = pSelect->hasTimeLineFunc ? DATA_ORDER_LEVEL_IN_GROUP : DATA_ORDER_LEVEL_IN_BLOCK;
   pWindow->node.resultDataOrder = DATA_ORDER_LEVEL_IN_GROUP;
 
   pWindow->pTspk = nodesCloneNode(pInterval->pCol);