diff --git a/source/libs/executor/src/executorimpl.c b/source/libs/executor/src/executorimpl.c
index 292e435732f68d6b728565a3e917d2a53923984e..4b03bc9b114e168fc9dd69e6be8380a89d2c8b2f 100644
--- a/source/libs/executor/src/executorimpl.c
+++ b/source/libs/executor/src/executorimpl.c
@@ -2879,7 +2879,7 @@ int32_t getTableScanInfo(SOperatorInfo* pOperator, int32_t* order, int32_t* scan
     *order = TSDB_ORDER_ASC;
     *scanFlag = MAIN_SCAN;
     return TSDB_CODE_SUCCESS;
-  } else if (type == QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN) {
+  } else if (type == QUERY_NODE_PHYSICAL_PLAN_TABLE_SCAN || type == QUERY_NODE_PHYSICAL_PLAN_TABLE_MERGE_SCAN) {
     STableScanInfo* pTableScanInfo = pOperator->info;
     *order = pTableScanInfo->cond.order;
     *scanFlag = pTableScanInfo->scanFlag;
diff --git a/source/libs/parser/src/parInsert.c b/source/libs/parser/src/parInsert.c
index 2c7307b660ca7746db7ad9876432cc79c54df65c..8fa8fd4cf859bdf050bc06fe43ce9b4c021e505b 100644
--- a/source/libs/parser/src/parInsert.c
+++ b/source/libs/parser/src/parInsert.c
@@ -438,6 +438,10 @@ static bool isNullStr(SToken* pToken) {
           (strncasecmp(TSDB_DATA_NULL_STR_L, pToken->z, pToken->n) == 0));
 }
 
+static bool isNullValue(int8_t dataType, SToken* pToken) {
+  return TK_NULL == pToken->type || (!IS_STR_DATA_TYPE(dataType) && isNullStr(pToken));
+}
+
 static FORCE_INLINE int32_t toDouble(SToken* pToken, double* value, char** endPtr) {
   errno = 0;
   *value = taosStr2Double(pToken->z, endPtr);
@@ -461,7 +465,7 @@ static int32_t parseValueToken(char** end, SToken* pToken, SSchema* pSchema, int
     return code;
   }
 
-  if (TK_NULL == pToken->type || (!IS_VAR_DATA_TYPE(pSchema->type) && isNullStr(pToken))) {
+  if (isNullValue(pSchema->type, pToken)) {
     if (TSDB_DATA_TYPE_TIMESTAMP == pSchema->type && PRIMARYKEY_TIMESTAMP_COL_ID == pSchema->colId) {
       return buildSyntaxErrMsg(pMsgBuf, "primary timestamp should not be null", pToken->z);
     }
@@ -754,7 +758,7 @@ static int32_t parseTagToken(char** end, SToken* pToken, SSchema* pSchema, int16
   uint64_t uv;
   char*    endptr = NULL;
 
-  if (isNullStr(pToken)) {
+  if (isNullValue(pSchema->type, pToken)) {
     if (TSDB_DATA_TYPE_TIMESTAMP == pSchema->type && PRIMARYKEY_TIMESTAMP_COL_ID == pSchema->colId) {
       return buildSyntaxErrMsg(pMsgBuf, "primary timestamp should not be null", pToken->z);
     }
@@ -972,7 +976,7 @@ static int32_t parseTagsClause(SInsertParseContext* pCxt, SSchema* pSchema, uint
       goto end;
     }
 
-    if (!isNullStr(&sToken)) {
+    if (!isNullValue(pTagSchema->type, &sToken)) {
       taosArrayPush(tagName, pTagSchema->name);
     }
     if (pTagSchema->type == TSDB_DATA_TYPE_JSON) {
@@ -981,7 +985,7 @@ static int32_t parseTagsClause(SInsertParseContext* pCxt, SSchema* pSchema, uint
         taosMemoryFree(tmpTokenBuf);
         goto end;
       }
-      if (isNullStr(&sToken)) {
+      if (isNullValue(pTagSchema->type, &sToken)) {
         code = tTagNew(pTagVals, 1, true, &pTag);
       } else {
         code = parseJsontoTagData(sToken.z, pTagVals, &pTag, &pCxt->msg);
@@ -1561,7 +1565,7 @@ int32_t parseInsertSql(SParseContext* pContext, SQuery** pQuery, SParseMetaCache
   } else {
     nodesDestroyNode((*pQuery)->pRoot);
   }
-  
+
   (*pQuery)->execMode = QUERY_EXEC_MODE_SCHEDULE;
   (*pQuery)->haveResultSet = false;
   (*pQuery)->msgType = TDMT_VND_SUBMIT;