diff --git a/source/libs/nodes/src/nodesCloneFuncs.c b/source/libs/nodes/src/nodesCloneFuncs.c
index 12cd6f1bc19360deb0daf369b84b9f35a81b7de2..60692323f5806c852c8e7dc53d5857a192a93882 100644
--- a/source/libs/nodes/src/nodesCloneFuncs.c
+++ b/source/libs/nodes/src/nodesCloneFuncs.c
@@ -141,12 +141,12 @@ static SNode* valueNodeCopy(const SValueNode* pSrc, SValueNode* pDst) {
     case TSDB_DATA_TYPE_NCHAR:
     case TSDB_DATA_TYPE_VARCHAR:
     case TSDB_DATA_TYPE_VARBINARY:
-      pDst->datum.p = malloc(pSrc->node.resType.bytes + VARSTR_HEADER_SIZE);
+      pDst->datum.p = malloc(pSrc->node.resType.bytes + VARSTR_HEADER_SIZE + 1);
       if (NULL == pDst->datum.p) {
         nodesDestroyNode(pDst);
         return NULL;
       }
-      memcpy(pDst->datum.p, pSrc->datum.p, pSrc->node.resType.bytes + VARSTR_HEADER_SIZE);
+      memcpy(pDst->datum.p, pSrc->datum.p, pSrc->node.resType.bytes + VARSTR_HEADER_SIZE + 1);
       break;
     case TSDB_DATA_TYPE_JSON:
     case TSDB_DATA_TYPE_DECIMAL:
diff --git a/source/libs/nodes/src/nodesCodeFuncs.c b/source/libs/nodes/src/nodesCodeFuncs.c
index b648e1880945528eb4af4b531b9bc9cccfc551e6..37be210610fea287aac0c951ba11131db336e03b 100644
--- a/source/libs/nodes/src/nodesCodeFuncs.c
+++ b/source/libs/nodes/src/nodesCodeFuncs.c
@@ -1807,6 +1807,45 @@ static int32_t groupingSetNodeToJson(const void* pObj, SJson* pJson) {
   return code;
 }
 
+static const char* jkIntervalWindowInterval = "Interval";
+static const char* jkIntervalWindowOffset = "Offset";
+static const char* jkIntervalWindowSliding = "Sliding";
+static const char* jkIntervalWindowFill = "Fill";
+
+static int32_t intervalWindowNodeToJson(const void* pObj, SJson* pJson) {
+  const SIntervalWindowNode* pNode = (const SIntervalWindowNode*)pObj;
+
+  int32_t code = tjsonAddObject(pJson, jkIntervalWindowInterval, nodeToJson, pNode->pInterval);
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonAddObject(pJson, jkIntervalWindowOffset, nodeToJson, pNode->pOffset);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonAddObject(pJson, jkIntervalWindowSliding, nodeToJson, pNode->pSliding);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = tjsonAddObject(pJson, jkIntervalWindowFill, nodeToJson, pNode->pFill);
+  }
+
+  return code;
+}
+
+static int32_t jsonToIntervalWindowNode(const SJson* pJson, void* pObj) {
+  SIntervalWindowNode* pNode = (SIntervalWindowNode*)pObj;
+
+  int32_t code = jsonToNodeObject(pJson, jkIntervalWindowInterval, &pNode->pInterval);
+  if (TSDB_CODE_SUCCESS == code) {
+    code = jsonToNodeObject(pJson, jkIntervalWindowOffset, &pNode->pOffset);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = jsonToNodeObject(pJson, jkIntervalWindowSliding, &pNode->pSliding);
+  }
+  if (TSDB_CODE_SUCCESS == code) {
+    code = jsonToNodeObject(pJson, jkIntervalWindowFill, &pNode->pFill);
+  }
+
+  return code;
+}
+
 static const char* jkNodeListDataType = "DataType";
 static const char* jkNodeListNodeList = "NodeList";
 
@@ -2119,8 +2158,9 @@ static int32_t specificNodeToJson(const void* pObj, SJson* pJson) {
     case QUERY_NODE_LIMIT:
     case QUERY_NODE_STATE_WINDOW:
     case QUERY_NODE_SESSION_WINDOW:
-    case QUERY_NODE_INTERVAL_WINDOW:
       break;
+    case QUERY_NODE_INTERVAL_WINDOW:
+      return intervalWindowNodeToJson(pObj, pJson);
     case QUERY_NODE_NODE_LIST:
       return nodeListNodeToJson(pObj, pJson);
     case QUERY_NODE_FILL:
@@ -2222,7 +2262,8 @@ static int32_t jsonToSpecificNode(const SJson* pJson, void* pObj) {
     // case QUERY_NODE_LIMIT:
     // case QUERY_NODE_STATE_WINDOW:
     // case QUERY_NODE_SESSION_WINDOW:
-    // case QUERY_NODE_INTERVAL_WINDOW:
+    case QUERY_NODE_INTERVAL_WINDOW:
+      return jsonToIntervalWindowNode(pJson, pObj);
     case QUERY_NODE_NODE_LIST:
       return jsonToNodeListNode(pJson, pObj);
     // case QUERY_NODE_FILL:
diff --git a/source/libs/planner/test/plannerTest.cpp b/source/libs/planner/test/plannerTest.cpp
index 69203384f8c0ec5b77cd36735a546f5b1e36814f..319e539fa81b1a5ae2667b9d14875527678cd4e1 100644
--- a/source/libs/planner/test/plannerTest.cpp
+++ b/source/libs/planner/test/plannerTest.cpp
@@ -112,6 +112,11 @@ private:
     if (QUERY_NODE_CREATE_TOPIC_STMT == nodeType(pQuery->pRoot)) {
       pCxt->pAstRoot = ((SCreateTopicStmt*)pQuery->pRoot)->pQuery;
       pCxt->topicQuery = true;
+    } else if (QUERY_NODE_CREATE_INDEX_STMT == nodeType(pQuery->pRoot)) {
+      SMCreateSmaReq req = {0};
+      tDeserializeSMCreateSmaReq(pQuery->pCmdMsg->pMsg, pQuery->pCmdMsg->msgLen, &req);
+      nodesStringToNode(req.ast, &pCxt->pAstRoot);
+      pCxt->streamQuery = true;
     } else {
       pCxt->pAstRoot = pQuery->pRoot;
     }
@@ -215,3 +220,10 @@ TEST_F(PlannerTest, stream) {
   bind("SELECT sum(c1) FROM st1");
   ASSERT_TRUE(run(true));
 }
+
+TEST_F(PlannerTest, createSmaIndex) {
+  setDatabase("root", "test");
+
+  bind("create sma index index1 on t1 function(max(c1), min(c3 + 10), sum(c4)) INTERVAL(10s)");
+  ASSERT_TRUE(run());
+}