diff --git a/source/libs/function/src/builtins.c b/source/libs/function/src/builtins.c
index 24a781855a..c9d556c86b 100644
--- a/source/libs/function/src/builtins.c
+++ b/source/libs/function/src/builtins.c
@@ -445,6 +445,11 @@ static int32_t translateStateCount(SFunctionNode* pFunc, char* pErrBuf, int32_t
   }
 
   // param0
+  SNode* pParaNode0 = nodesListGetNode(pFunc->pParameterList, 0);
+  if (QUERY_NODE_COLUMN != nodeType(pParaNode0)) {
+    return buildFuncErrMsg(pErrBuf, len, TSDB_CODE_FUNC_FUNTION_ERROR,
+                           "The input parameter of STATECOUNT function can only be column");
+  }
   uint8_t colType = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
   if (!IS_NUMERIC_TYPE(colType)) {
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
@@ -480,6 +485,11 @@ static int32_t translateStateDuration(SFunctionNode* pFunc, char* pErrBuf, int32
   }
 
   // param0
+  SNode* pParaNode0 = nodesListGetNode(pFunc->pParameterList, 0);
+  if (QUERY_NODE_COLUMN != nodeType(pParaNode0)) {
+    return buildFuncErrMsg(pErrBuf, len, TSDB_CODE_FUNC_FUNTION_ERROR,
+                           "The input parameter of STATEDURATION function can only be column");
+  }
   uint8_t colType = ((SExprNode*)nodesListGetNode(pFunc->pParameterList, 0))->resType.type;
   if (!IS_NUMERIC_TYPE(colType)) {
     return invaildFuncParaTypeErrMsg(pErrBuf, len, pFunc->functionName);
@@ -1181,7 +1191,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .finalizeFunc = functionFinalize
   },
   {
-    .name = "state_count",
+    .name = "statecount",
     .type = FUNCTION_TYPE_STATE_COUNT,
     .classification = FUNC_MGT_INDEFINITE_ROWS_FUNC,
     .translateFunc = translateStateCount,
@@ -1191,7 +1201,7 @@ const SBuiltinFuncDefinition funcMgtBuiltins[] = {
     .finalizeFunc = NULL
   },
   {
-    .name = "state_duration",
+    .name = "stateduration",
     .type = FUNCTION_TYPE_STATE_DURATION,
     .classification = FUNC_MGT_INDEFINITE_ROWS_FUNC | FUNC_MGT_TIMELINE_FUNC,
     .translateFunc = translateStateDuration,
diff --git a/source/libs/function/src/builtinsimpl.c b/source/libs/function/src/builtinsimpl.c
index 068d06fc31..8707946253 100644
--- a/source/libs/function/src/builtinsimpl.c
+++ b/source/libs/function/src/builtinsimpl.c
@@ -3776,6 +3776,7 @@ static void tailAssignResult(STailItem* pItem, char *data, int32_t colBytes, TSK
   if (isNull) {
     pItem->isNull = true;
   } else {
+    pItem->isNull = false;
     memcpy(pItem->data, data, colBytes);
   }
 }