diff --git a/example/src/tstream.c b/example/src/tstream.c
index 8ffa932bd29d6f89441c7f045611f42e058dd872..51578bd27b54eba0a50c3bf5bc18066138ad5b48 100644
--- a/example/src/tstream.c
+++ b/example/src/tstream.c
@@ -25,7 +25,7 @@ int32_t init_env() {
     return -1;
   }
 
-  TAOS_RES* pRes = taos_query(pConn, "create database if not exists abc1 vgroups 2");
+  TAOS_RES* pRes = taos_query(pConn, "create database if not exists abc1 vgroups 1");
   if (taos_errno(pRes) != 0) {
     printf("error in create db, reason:%s\n", taos_errstr(pRes));
     return -1;
diff --git a/include/common/tcommon.h b/include/common/tcommon.h
index eb9f45087295841fbf03e580955d430f510522f0..67611d95630d3f8d6e350e90235b7620fa5ee748 100644
--- a/include/common/tcommon.h
+++ b/include/common/tcommon.h
@@ -127,7 +127,7 @@ static FORCE_INLINE int32_t tEncodeSMqPollRsp(void** buf, const SMqPollRsp* pRsp
   tlen += taosEncodeFixedI32(buf, pRsp->skipLogNum);
   tlen += taosEncodeFixedI32(buf, pRsp->numOfTopics);
   if (pRsp->numOfTopics == 0) return tlen;
-  tlen += tEncodeSSchemaWrapper(buf, pRsp->schema);
+  tlen += taosEncodeSSchemaWrapper(buf, pRsp->schema);
   if (pRsp->pBlockData) {
     sz = taosArrayGetSize(pRsp->pBlockData);
   }
@@ -149,7 +149,7 @@ static FORCE_INLINE void* tDecodeSMqPollRsp(void* buf, SMqPollRsp* pRsp) {
   if (pRsp->numOfTopics == 0) return buf;
   pRsp->schema = (SSchemaWrapper*)taosMemoryCalloc(1, sizeof(SSchemaWrapper));
   if (pRsp->schema == NULL) return NULL;
-  buf = tDecodeSSchemaWrapper(buf, pRsp->schema);
+  buf = taosDecodeSSchemaWrapper(buf, pRsp->schema);
   buf = taosDecodeFixedI32(buf, &sz);
   pRsp->pBlockData = taosArrayInit(sz, sizeof(SSDataBlock));
   for (int32_t i = 0; i < sz; i++) {
diff --git a/include/common/tmsg.h b/include/common/tmsg.h
index 136a576c7cbdbbdbf7b2a975dfbb2aca27060b84..4c7be6b541f5dfa5999d9204849c4945dc22b4a8 100644
--- a/include/common/tmsg.h
+++ b/include/common/tmsg.h
@@ -1931,7 +1931,7 @@ static FORCE_INLINE int32_t tDecodeSSchema(SCoder* pDecoder, SSchema* pSchema) {
   return 0;
 }
 
-static FORCE_INLINE int32_t tEncodeSSchemaWrapper(void** buf, const SSchemaWrapper* pSW) {
+static FORCE_INLINE int32_t taosEncodeSSchemaWrapper(void** buf, const SSchemaWrapper* pSW) {
   int32_t tlen = 0;
   tlen += taosEncodeFixedU32(buf, pSW->nCols);
   for (int32_t i = 0; i < pSW->nCols; i++) {
@@ -1940,7 +1940,7 @@ static FORCE_INLINE int32_t tEncodeSSchemaWrapper(void** buf, const SSchemaWrapp
   return tlen;
 }
 
-static FORCE_INLINE void* tDecodeSSchemaWrapper(void* buf, SSchemaWrapper* pSW) {
+static FORCE_INLINE void* taosDecodeSSchemaWrapper(void* buf, SSchemaWrapper* pSW) {
   buf = taosDecodeFixedU32(buf, &pSW->nCols);
   pSW->pSchema = (SSchema*)taosMemoryCalloc(pSW->nCols, sizeof(SSchema));
   if (pSW->pSchema == NULL) {
@@ -1953,6 +1953,27 @@ static FORCE_INLINE void* tDecodeSSchemaWrapper(void* buf, SSchemaWrapper* pSW)
   return buf;
 }
 
+static FORCE_INLINE int32_t tEncodeSSchemaWrapper(SCoder* pEncoder, const SSchemaWrapper* pSW) {
+  if (tEncodeU32(pEncoder, pSW->nCols) < 0) return -1;
+  for (int32_t i = 0; i < pSW->nCols; i++) {
+    if (tEncodeSSchema(pEncoder, &pSW->pSchema[i]) < 0) return -1;
+  }
+  return pEncoder->pos;
+}
+
+static FORCE_INLINE int32_t tDecodeSSchemaWrapper(SCoder* pDecoder, SSchemaWrapper* pSW) {
+  if (tDecodeU32(pDecoder, &pSW->nCols) < 0) return -1;
+  void* ptr = taosMemoryRealloc(pSW->pSchema, pSW->nCols * sizeof(SSchema));
+  if (ptr == NULL) {
+    return -1;
+  }
+  pSW->pSchema = (SSchema*)ptr;
+  for (int32_t i = 0; i < pSW->nCols; i++) {
+    if (tDecodeSSchema(pDecoder, &pSW->pSchema[i]) < 0) return -1;
+  }
+  return 0;
+}
+
 typedef struct {
   char    name[TSDB_TABLE_FNAME_LEN];
   char    stb[TSDB_TABLE_FNAME_LEN];
diff --git a/include/util/taoserror.h b/include/util/taoserror.h
index 87781b6313d73f3060afe90d6bba17197e8373bb..994ad7afc683397f1dc82ccdf0a4e8e1be29e623 100644
--- a/include/util/taoserror.h
+++ b/include/util/taoserror.h
@@ -16,6 +16,8 @@
 #ifndef _TD_UTIL_TAOS_ERROR_H_
 #define _TD_UTIL_TAOS_ERROR_H_
 
+#include "os.h"
+
 #ifdef __cplusplus
 extern "C" {
 #endif
diff --git a/source/dnode/mnode/impl/inc/mndDef.h b/source/dnode/mnode/impl/inc/mndDef.h
index eb7ac5b3539ac8cbd94495583293c227671c768c..2c4f2e82acd8938596d46e749733c3d050157df7 100644
--- a/source/dnode/mnode/impl/inc/mndDef.h
+++ b/source/dnode/mnode/impl/inc/mndDef.h
@@ -733,12 +733,12 @@ typedef struct {
   int8_t   sourceType;
   int8_t   sinkType;
   // int32_t  sqlLen;
-  int32_t sinkVgId;  // 0 for automatic
-  char*   sql;
-  char*   logicalPlan;
-  char*   physicalPlan;
-  SArray* tasks;     // SArray<SArray<SStreamTask>>
-  SArray* ColAlias;  // SArray<char*>
+  int32_t        sinkVgId;  // 0 for automatic
+  char*          sql;
+  char*          logicalPlan;
+  char*          physicalPlan;
+  SArray*        tasks;  // SArray<SArray<SStreamTask>>
+  SSchemaWrapper outputSchema;
 } SStreamObj;
 
 int32_t tEncodeSStreamObj(SCoder* pEncoder, const SStreamObj* pObj);
diff --git a/source/dnode/mnode/impl/src/mndDef.c b/source/dnode/mnode/impl/src/mndDef.c
index 6fa926d548a1955cdb396b914101c1a5b7cbb113..24f2a5df227f80fc9bb62c144f351e711f04f5b0 100644
--- a/source/dnode/mnode/impl/src/mndDef.c
+++ b/source/dnode/mnode/impl/src/mndDef.c
@@ -17,7 +17,7 @@
 
 int32_t tEncodeSStreamObj(SCoder *pEncoder, const SStreamObj *pObj) {
   int32_t sz = 0;
-  int32_t outputNameSz = 0;
+  /*int32_t outputNameSz = 0;*/
   if (tEncodeCStr(pEncoder, pObj->name) < 0) return -1;
   if (tEncodeCStr(pEncoder, pObj->db) < 0) return -1;
   if (tEncodeI64(pEncoder, pObj->createTime) < 0) return -1;
@@ -45,6 +45,9 @@ int32_t tEncodeSStreamObj(SCoder *pEncoder, const SStreamObj *pObj) {
     }
   }
 
+  if (tEncodeSSchemaWrapper(pEncoder, &pObj->outputSchema) < 0) return -1;
+
+#if 0
   if (pObj->ColAlias != NULL) {
     outputNameSz = taosArrayGetSize(pObj->ColAlias);
   }
@@ -53,6 +56,7 @@ int32_t tEncodeSStreamObj(SCoder *pEncoder, const SStreamObj *pObj) {
     char *name = taosArrayGetP(pObj->ColAlias, i);
     if (tEncodeCStr(pEncoder, name) < 0) return -1;
   }
+#endif
   return pEncoder->pos;
 }
 
@@ -85,6 +89,9 @@ int32_t tDecodeSStreamObj(SCoder *pDecoder, SStreamObj *pObj) {
       taosArrayPush(pObj->tasks, pArray);
     }
   }
+
+  if (tDecodeSSchemaWrapper(pDecoder, &pObj->outputSchema) < 0) return -1;
+#if 0
   int32_t outputNameSz;
   if (tDecodeI32(pDecoder, &outputNameSz) < 0) return -1;
   if (outputNameSz != 0) {
@@ -98,5 +105,6 @@ int32_t tDecodeSStreamObj(SCoder *pDecoder, SStreamObj *pObj) {
     if (tDecodeCStrAlloc(pDecoder, &name) < 0) return -1;
     taosArrayPush(pObj->ColAlias, &name);
   }
+#endif
   return 0;
 }
diff --git a/source/dnode/mnode/impl/src/mndStream.c b/source/dnode/mnode/impl/src/mndStream.c
index dd62bc0364eb35b8cd4697c919afde86d9e5f1ad..47624dfcc14588544d2a4316a40f935886a2ada0 100644
--- a/source/dnode/mnode/impl/src/mndStream.c
+++ b/source/dnode/mnode/impl/src/mndStream.c
@@ -14,7 +14,6 @@
  */
 
 #include "mndStream.h"
-#include "parser.h"
 #include "mndAuth.h"
 #include "mndDb.h"
 #include "mndDnode.h"
@@ -26,6 +25,7 @@
 #include "mndTrans.h"
 #include "mndUser.h"
 #include "mndVgroup.h"
+#include "parser.h"
 #include "tname.h"
 
 #define MND_STREAM_VER_NUMBER   1
@@ -248,23 +248,21 @@ static int32_t mndStreamGetPlanString(const char *ast, char **pStr) {
 
 int32_t mndAddStreamToTrans(SMnode *pMnode, SStreamObj *pStream, const char *ast, STrans *pTrans) {
   SNode *pAst = NULL;
-#if 1 // TODO: remove debug info later
-  printf("ast = %s\n", ast); 
+#if 1  // TODO: remove debug info later
+  printf("ast = %s\n", ast);
 #endif
   if (nodesStringToNode(ast, &pAst) < 0) {
     return -1;
   }
 #if 1
-  SSchemaWrapper sw = {0};
-  qExtractResultSchema(pAst, (int32_t*)&sw.nCols, &sw.pSchema);
+  qExtractResultSchema(pAst, (int32_t *)&pStream->outputSchema.nCols, &pStream->outputSchema.pSchema);
 
   printf("|");
-  for (int i = 0; i < sw.nCols; i++) {
-    printf(" %15s |", (char *)sw.pSchema[i].name);
+  for (int i = 0; i < pStream->outputSchema.nCols; i++) {
+    printf(" %15s |", (char *)pStream->outputSchema.pSchema[i].name);
   }
   printf("\n=======================================================\n");
 
-  pStream->ColAlias = NULL;
 #endif
 
   if (TSDB_CODE_SUCCESS != mndStreamGetPlanString(ast, &pStream->physicalPlan)) {
diff --git a/source/libs/wal/src/walMeta.c b/source/libs/wal/src/walMeta.c
index cbe7cb81db9f855597bc717e6bfe441b281bcc11..83c48628a3c85669b807560deb03daa0566927a5 100644
--- a/source/libs/wal/src/walMeta.c
+++ b/source/libs/wal/src/walMeta.c
@@ -37,8 +37,7 @@ void* tmemmem(char* haystack, int hlen, char* needle, int nlen) {
   }
 
   limit = haystack + hlen - nlen + 1;
-  while ((haystack = (char*)memchr(
-              haystack, needle[0], limit - haystack)) != NULL) {
+  while ((haystack = (char*)memchr(haystack, needle[0], limit - haystack)) != NULL) {
     if (memcmp(haystack, needle, nlen) == 0) {
       return haystack;
     }
@@ -57,8 +56,8 @@ static inline int64_t walScanLogGetLastVer(SWal* pWal) {
   }
 #endif
 
-  SWalFileInfo *pLastFileInfo = taosArrayGet(pWal->fileInfoSet, sz-1);
-  char fnameStr[WAL_FILE_LEN];
+  SWalFileInfo* pLastFileInfo = taosArrayGet(pWal->fileInfoSet, sz - 1);
+  char          fnameStr[WAL_FILE_LEN];
   walBuildLogName(pWal, pLastFileInfo->firstVer, fnameStr);
 
   int64_t file_size = 0;
@@ -88,20 +87,20 @@ static inline int64_t walScanLogGetLastVer(SWal* pWal) {
     terrno = TAOS_SYSTEM_ERROR(errno);
     return -1;
   }
-  
+
   char* haystack = buf;
   char* found = NULL;
-  char *candidate;
-  while((candidate = tmemmem(haystack, readSize - (haystack - buf), (char*)&magic, sizeof(uint64_t))) != NULL) {
+  char* candidate;
+  while ((candidate = tmemmem(haystack, readSize - (haystack - buf), (char*)&magic, sizeof(uint64_t))) != NULL) {
     // read and validate
-    SWalHead *logContent = (SWalHead*)candidate;
+    SWalHead* logContent = (SWalHead*)candidate;
     if (walValidHeadCksum(logContent) == 0 && walValidBodyCksum(logContent) == 0) {
       found = candidate;
     }
     haystack = candidate + 1;
   }
   if (found == buf) {
-    SWalHead *logContent = (SWalHead*)found;
+    SWalHead* logContent = (SWalHead*)found;
     if (walValidHeadCksum(logContent) != 0 || walValidBodyCksum(logContent) != 0) {
       // file has to be deleted
       taosMemoryFree(buf);
@@ -111,7 +110,7 @@ static inline int64_t walScanLogGetLastVer(SWal* pWal) {
     }
   }
   taosCloseFile(&pFile);
-  SWalHead *lastEntry = (SWalHead*)found;
+  SWalHead* lastEntry = (SWalHead*)found;
 
   return lastEntry->head.version;
 }
@@ -158,10 +157,10 @@ int walCheckAndRepairMeta(SWal* pWal) {
   int newSz = taosArrayGetSize(pLogInfoArray);
 
   if (oldSz > newSz) {
-    taosArrayPopFrontBatch(pWal->fileInfoSet, oldSz - newSz); 
+    taosArrayPopFrontBatch(pWal->fileInfoSet, oldSz - newSz);
   } else if (oldSz < newSz) {
     for (int i = oldSz; i < newSz; i++) {
-      SWalFileInfo *pFileInfo = taosArrayGet(pLogInfoArray, i);
+      SWalFileInfo* pFileInfo = taosArrayGet(pLogInfoArray, i);
       taosArrayPush(pWal->fileInfoSet, pFileInfo);
     }
   }
@@ -171,8 +170,8 @@ int walCheckAndRepairMeta(SWal* pWal) {
   if (newSz > 0) {
     pWal->vers.firstVer = ((SWalFileInfo*)taosArrayGet(pWal->fileInfoSet, 0))->firstVer;
 
-    SWalFileInfo *pLastFileInfo = taosArrayGet(pWal->fileInfoSet, newSz-1);
-    char fnameStr[WAL_FILE_LEN];
+    SWalFileInfo* pLastFileInfo = taosArrayGet(pWal->fileInfoSet, newSz - 1);
+    char          fnameStr[WAL_FILE_LEN];
     walBuildLogName(pWal, pLastFileInfo->firstVer, fnameStr);
     int64_t file_size = 0;
     taosStatFile(fnameStr, &file_size, NULL);
@@ -191,8 +190,8 @@ int walCheckAndRepairMeta(SWal* pWal) {
     }
   }
 
-  //TODO: set fileSize and lastVer if necessary
-  
+  // TODO: set fileSize and lastVer if necessary
+
   return 0;
 }
 
@@ -239,13 +238,13 @@ char* walMetaSerialize(SWal* pWal) {
   cJSON* pFiles = cJSON_CreateArray();
   cJSON* pField;
   if (pRoot == NULL || pMeta == NULL || pFiles == NULL) {
-    if(pRoot) {
+    if (pRoot) {
       cJSON_Delete(pRoot);
     }
-    if(pMeta) {
+    if (pMeta) {
       cJSON_Delete(pMeta);
     }
-    if(pFiles) {
+    if (pFiles) {
       cJSON_Delete(pFiles);
     }
     terrno = TSDB_CODE_WAL_OUT_OF_MEMORY;
diff --git a/source/libs/wal/src/walRead.c b/source/libs/wal/src/walRead.c
index e15c1620480c1825714ab7d36550b31a5be9132f..9d7c9ed9dfa4290dff44f64e875ea7acddb52b08 100644
--- a/source/libs/wal/src/walRead.c
+++ b/source/libs/wal/src/walRead.c
@@ -13,8 +13,8 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "walInt.h"
 #include "taoserror.h"
+#include "walInt.h"
 
 SWalReadHandle *walOpenReadHandle(SWal *pWal) {
   SWalReadHandle *pRead = taosMemoryMalloc(sizeof(SWalReadHandle));
@@ -92,6 +92,7 @@ static int32_t walReadChangeFile(SWalReadHandle *pRead, int64_t fileFirstVer) {
   walBuildIdxName(pRead->pWal, fileFirstVer, fnameStr);
   TdFilePtr pIdxTFile = taosOpenFile(fnameStr, TD_FILE_READ);
   if (pIdxTFile == NULL) {
+    terrno = TAOS_SYSTEM_ERROR(errno);
     return -1;
   }
 
@@ -169,7 +170,8 @@ int32_t walReadWithHandle(SWalReadHandle *pRead, int64_t ver) {
   }
 
   if (pRead->pHead->head.version != ver) {
-    wError("unexpected wal log version: %" PRId64 ", read request version:%" PRId64 "", pRead->pHead->head.version, ver);
+    wError("unexpected wal log version: %" PRId64 ", read request version:%" PRId64 "", pRead->pHead->head.version,
+           ver);
     pRead->curVersion = -1;
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
     return -1;
@@ -177,7 +179,7 @@ int32_t walReadWithHandle(SWalReadHandle *pRead, int64_t ver) {
 
   code = walValidBodyCksum(pRead->pHead);
   if (code != 0) {
-    wError("unexpected wal log version: checksum not passed");
+    wError("unexpected wal log version: % " PRId64 "checksum not passed", ver);
     pRead->curVersion = -1;
     terrno = TSDB_CODE_WAL_FILE_CORRUPTED;
     return -1;