diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index 2fb4657407..87781b6313 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -475,6 +475,7 @@ int32_t* taosGetErrno();
 #define TSDB_CODE_PAR_INVALID_PORT              TAOS_DEF_ERROR_CODE(0, 0x2612)
 #define TSDB_CODE_PAR_INVALID_ENDPOINT          TAOS_DEF_ERROR_CODE(0, 0x2613)
 #define TSDB_CODE_PAR_EXPRIE_STATEMENT          TAOS_DEF_ERROR_CODE(0, 0x2614)
+#define TSDB_CODE_PAR_INTERVAL_VALUE_TOO_SMALL  TAOS_DEF_ERROR_CODE(0, 0x2615)
 
 #ifdef __cplusplus
 }
diff --git a/source/libs/parser/src/parTranslater.c b/source/libs/parser/src/parTranslater.c
index 930aadd9ad..f82ce2c1b4 100644
--- a/source/libs/parser/src/parTranslater.c
+++ b/source/libs/parser/src/parTranslater.c
@@ -824,11 +824,30 @@ static int32_t translateGroupBy(STranslateContext* pCxt, SNodeList* pGroupByList
   return translateExprList(pCxt, pGroupByList);
 }
 
+static int32_t translateIntervalWindow(STranslateContext* pCxt, SIntervalWindowNode* pInterval) {
+  SValueNode* pIntervalVal = (SValueNode*)pInterval->pInterval;
+  SValueNode* pIntervalOffset = (SValueNode*)pInterval->pOffset;
+  SValueNode* pSliding = (SValueNode*)pInterval->pSliding;
+  if (pIntervalVal->datum.i <= 0) {
+    return generateSyntaxErrMsg(&pCxt->msgBuf, TSDB_CODE_PAR_INTERVAL_VALUE_TOO_SMALL, pIntervalVal->literal);
+  }
+  return TSDB_CODE_SUCCESS;
+}
+
 static int32_t doTranslateWindow(STranslateContext* pCxt, SNode* pWindow) {
+  switch (nodeType(pWindow)) {
+    case QUERY_NODE_INTERVAL_WINDOW:
+      return translateIntervalWindow(pCxt, (SIntervalWindowNode*)pWindow);    
+    default:
+      break;
+  }
   return TSDB_CODE_SUCCESS;
 }
 
 static int32_t translateWindow(STranslateContext* pCxt, SNode* pWindow) {
+  if (NULL == pWindow) {
+    return TSDB_CODE_SUCCESS;
+  }
   pCxt->currClause = SQL_CLAUSE_WINDOW;
   int32_t code = translateExpr(pCxt, pWindow);
   if (TSDB_CODE_SUCCESS == code) {
diff --git a/source/libs/parser/src/parUtil.c b/source/libs/parser/src/parUtil.c
index 64c6b761d9..2e3936a6fb 100644
--- a/source/libs/parser/src/parUtil.c
+++ b/source/libs/parser/src/parUtil.c
@@ -59,6 +59,8 @@ static char* getSyntaxErrFormat(int32_t errCode) {
       return "Endpoint should be in the format of 'fqdn:port'";
     case TSDB_CODE_PAR_EXPRIE_STATEMENT:
       return "This statement is no longer supported";
+    case TSDB_CODE_PAR_INTERVAL_VALUE_TOO_SMALL:
+      return "This interval value is too small : %s";
     case TSDB_CODE_OUT_OF_MEMORY:
       return "Out of memory";
     default:
diff --git a/source/libs/parser/test/mockCatalogService.cpp b/source/libs/parser/test/mockCatalogService.cpp
index 9abaf5b14f..4d80c47ec6 100644
--- a/source/libs/parser/test/mockCatalogService.cpp
+++ b/source/libs/parser/test/mockCatalogService.cpp
@@ -120,23 +120,15 @@ public:
   }
 
   int32_t catalogGetTableHashVgroup(const SName* pTableName, SVgroupInfo* vgInfo) const {
-    // todo
-    vgInfo->vgId = 1;
-    addEpIntoEpSet(&vgInfo->epSet, "node1", 6030);
-    return 0;
+    char db[TSDB_DB_NAME_LEN] = {0};
+    tNameGetDbName(pTableName, db);
+    return copyTableVgroup(db, tNameGetTableName(pTableName), vgInfo);
   }
 
-  int32_t catalogGetTableDistVgInfo(const SName* pTableName, SArray** pVgList) const {
-    SVgroupInfo info = {0};
-    info.vgId = 1;
-    addEpIntoEpSet(&info.epSet, "node1", 6030);
-
-    info.hashBegin = 0;
-    info.hashEnd = 1;
-    *pVgList = taosArrayInit(4, sizeof(SVgroupInfo));
-
-    taosArrayPush(*pVgList, &info);
-    return 0;
+  int32_t catalogGetTableDistVgInfo(const SName* pTableName, SArray** vgList) const {
+    char db[TSDB_DB_NAME_LEN] = {0};
+    tNameGetDbName(pTableName, db);
+    return copyTableVgroup(db, tNameGetTableName(pTableName), vgList);
   }
 
   TableBuilder& createTableBuilder(const std::string& db, const std::string& tbname, int8_t tableType, int32_t numOfColumns, int32_t numOfTags) {
@@ -293,6 +285,27 @@ private:
     return TSDB_CODE_SUCCESS;
   }
 
+  int32_t copyTableVgroup(const std::string& db, const std::string& tbname, SVgroupInfo* vg) const {
+    std::shared_ptr<MockTableMeta> table = getTableMeta(db, tbname);
+    if (table->vgs.empty()) {
+      return TSDB_CODE_SUCCESS;
+    }
+    memcpy(vg, &(table->vgs[0]), sizeof(SVgroupInfo));
+    return TSDB_CODE_SUCCESS;
+  }
+
+  int32_t copyTableVgroup(const std::string& db, const std::string& tbname, SArray** vgList) const {
+    std::shared_ptr<MockTableMeta> table = getTableMeta(db, tbname);
+    if (table->vgs.empty()) {
+      return TSDB_CODE_SUCCESS;
+    }
+    *vgList = taosArrayInit(table->vgs.size(), sizeof(SVgroupInfo));
+    for (const SVgroupInfo& vg : table->vgs) {
+      taosArrayPush(*vgList, &vg);
+    }
+    return TSDB_CODE_SUCCESS;
+  }
+
   uint64_t id_;
   std::unique_ptr<TableBuilder> builder_;
   DbMetaCache meta_;
diff --git a/source/libs/planner/src/planScaleOut.c b/source/libs/planner/src/planScaleOut.c
index d88b564ee5..6928b1728f 100644
--- a/source/libs/planner/src/planScaleOut.c
+++ b/source/libs/planner/src/planScaleOut.c
@@ -85,7 +85,7 @@ static int32_t setScanVgroup(SLogicNode* pNode, const SVgroupInfo* pVgroup) {
 }
 
 static int32_t scaleOutForScan(SScaleOutContext* pCxt, SLogicSubplan* pSubplan, int32_t level, SNodeList* pGroup) {
-  if (pSubplan->pVgroupList) {
+  if (pSubplan->pVgroupList && !pCxt->pPlanCxt->streamQuery) {
     int32_t code = TSDB_CODE_SUCCESS;
     for (int32_t i = 0; i < pSubplan->pVgroupList->numOfVgroups; ++i) {
       SLogicSubplan* pNewSubplan = singleCloneSubLogicPlan(pCxt, pSubplan, level);
diff --git a/source/libs/planner/src/planSpliter.c b/source/libs/planner/src/planSpliter.c
index 2bba9aefb1..d203d41cb0 100644
--- a/source/libs/planner/src/planSpliter.c
+++ b/source/libs/planner/src/planSpliter.c
@@ -106,6 +106,8 @@ static int32_t stsCreateExchangeNode(SSplitContext* pCxt, SLogicSubplan* pSubpla
     return TSDB_CODE_OUT_OF_MEMORY;
   }
 
+  pSubplan->subplanType = SUBPLAN_TYPE_MERGE;
+
   if (NULL == pScan->node.pParent) {
     pSubplan->pNode = (SLogicNode*)pExchange;
     return TSDB_CODE_SUCCESS;
diff --git a/source/libs/planner/test/plannerTest.cpp b/source/libs/planner/test/plannerTest.cpp
index 67a637a956..8958af4663 100644
--- a/source/libs/planner/test/plannerTest.cpp
+++ b/source/libs/planner/test/plannerTest.cpp
@@ -41,7 +41,7 @@ protected:
     cxt_.pSql = sqlBuf_.c_str();
   }
 
-  bool run() {
+  bool run(bool streamQuery = false) {
     int32_t code = qParseQuerySql(&cxt_, &query_);
 
     if (code != TSDB_CODE_SUCCESS) {
@@ -52,7 +52,7 @@ protected:
     const string syntaxTreeStr = toString(query_->pRoot, false);
   
     SLogicNode* pLogicNode = nullptr;
-    SPlanContext cxt = { .queryId = 1, .acctId = 0 };
+    SPlanContext cxt = { .queryId = 1, .acctId = 0, .streamQuery = streamQuery };
     setPlanContext(query_, &cxt);
     code = createLogicPlan(&cxt, &pLogicNode);
     if (code != TSDB_CODE_SUCCESS) {
@@ -61,7 +61,7 @@ protected:
     }
   
     cout << "====================sql : [" << cxt_.pSql << "]" << endl;
-    cout << "syntax test : " << endl;
+    cout << "syntax tree : " << endl;
     cout << syntaxTreeStr << endl;
     cout << "unformatted logic plan : " << endl;
     cout << toString((const SNode*)pLogicNode, false) << endl;
@@ -204,3 +204,10 @@ TEST_F(PlannerTest, createTopic) {
   bind("create topic tp as SELECT * FROM st1");
   ASSERT_TRUE(run());
 }
+
+TEST_F(PlannerTest, stream) {
+  setDatabase("root", "test");
+
+  bind("SELECT sum(c1) FROM st1");
+  ASSERT_TRUE(run(true));
+}