diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index ea4b5aa2b47d8a0c200c427b0d9aec04ed64e116..a264d0cc44387d75f2d850c4a0ebb17039ec8c1c 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -620,16 +620,21 @@ static int32_t tscLaunchRealSubqueries(SSqlObj* pSql) {
     // set the join condition tag column info, todo extract method
     if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
       assert(pQueryInfo->tagCond.joinInfo.hasJoin);
+      pExpr->base.numOfParams = 0;    // the value is 0 by default. just make sure.
+      // add json tag key, if there is no json tag key, just hold place.
+      tVariantCreateFromBinary(&(pExpr->base.param[pExpr->base.numOfParams]), pQueryInfo->tagCond.joinInfo.joinTables[0]->tagJsonKeyName,
+                               strlen(pQueryInfo->tagCond.joinInfo.joinTables[0]->tagJsonKeyName), TSDB_DATA_TYPE_BINARY);
+      pExpr->base.numOfParams++;
       int16_t colId = tscGetJoinTagColIdByUid(&pQueryInfo->tagCond, pTableMetaInfo->pTableMeta->id.uid);
 
       // set the tag column id for executor to extract correct tag value
-      tVariant* pVariant = &pExpr->base.param[0];
+      tVariant* pVariant = &pExpr->base.param[pExpr->base.numOfParams];
 
       pVariant->i64   = colId;
       pVariant->nType = TSDB_DATA_TYPE_BIGINT;
       pVariant->nLen  = sizeof(int64_t);
 
-      pExpr->base.numOfParams = 1;
+      pExpr->base.numOfParams++;
     }
 
     if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
@@ -808,16 +813,21 @@ static void issueTsCompQuery(SSqlObj* pSql, SJoinSupporter* pSupporter, SSqlObj*
   SSchema colSchema = {.type = TSDB_DATA_TYPE_BINARY, .bytes = 1};
   
   SColumnIndex index = {0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
-  tscAddFuncInSelectClause(pQueryInfo, 0, TSDB_FUNC_TS_COMP, &index, &colSchema, TSDB_COL_NORMAL, getNewResColId(pCmd));
+  SExprInfo *pExpr = tscAddFuncInSelectClause(pQueryInfo, 0, TSDB_FUNC_TS_COMP, &index, &colSchema, TSDB_COL_NORMAL, getNewResColId(pCmd));
   
   // set the tags value for ts_comp function
   if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
-    SExprInfo *pExpr = tscExprGet(pQueryInfo, 0);
-    int16_t tagColId = tscGetJoinTagColIdByUid(&pSupporter->tagCond, pTableMetaInfo->pTableMeta->id.uid);
-    pExpr->base.param[0].i64 = tagColId;
-    pExpr->base.param[0].nLen = sizeof(int64_t);
-    pExpr->base.param[0].nType = TSDB_DATA_TYPE_BIGINT;
-    pExpr->base.numOfParams = 1;
+      pExpr->base.numOfParams = 0;    // the value is 0 by default. just make sure.
+      // add json tag key, if there is no json tag key, just hold place.
+      tVariantCreateFromBinary(&(pExpr->base.param[pExpr->base.numOfParams]), pSupporter->tagCond.joinInfo.joinTables[0]->tagJsonKeyName,
+                               strlen(pSupporter->tagCond.joinInfo.joinTables[0]->tagJsonKeyName), TSDB_DATA_TYPE_BINARY);
+      pExpr->base.numOfParams++;
+
+      int16_t tagColId = tscGetJoinTagColIdByUid(&pSupporter->tagCond, pTableMetaInfo->pTableMeta->id.uid);
+      pExpr->base.param[pExpr->base.numOfParams].i64 = tagColId;
+      pExpr->base.param[pExpr->base.numOfParams].nLen = sizeof(int64_t);
+      pExpr->base.param[pExpr->base.numOfParams].nType = TSDB_DATA_TYPE_BIGINT;
+      pExpr->base.numOfParams++;
   }
 
   // add the filter tag column
@@ -1930,15 +1940,6 @@ int32_t tscCreateJoinSubquery(SSqlObj *pSql, int16_t tableIndex, SJoinSupporter
       SColumnIndex colIndex = {0, PRIMARYKEY_TIMESTAMP_COL_INDEX};
       tscAddFuncInSelectClause(pNewQueryInfo, 0, TSDB_FUNC_TS_COMP, &colIndex, &colSchema, TSDB_COL_NORMAL, getNewResColId(pCmd));
 
-      // set the tags value for ts_comp function
-      SExprInfo *pExpr = tscExprGet(pNewQueryInfo, 0);
-
-      if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {
-        int16_t tagColId = tscGetJoinTagColIdByUid(&pSupporter->tagCond, pTableMetaInfo->pTableMeta->id.uid);
-        pExpr->base.param->i64 = tagColId;
-        pExpr->base.numOfParams = 1;
-      }
-
       // add the filter tag column
       if (pSupporter->colList != NULL) {
         size_t s = taosArrayGetSize(pSupporter->colList);
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index d76c3443ae5cd3a38d37465e20e7b6604de76ccf..22f4c64fc5cae03bed0ed0d1c816d965dccac8bd 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -3398,10 +3398,10 @@ void setTagValue(SOperatorInfo* pOperatorInfo, void *pTable, SQLFunctionCtx* pCt
   SQueryAttr *pQueryAttr = pRuntimeEnv->pQueryAttr;
 
   SExprInfo* pExprInfo = &pExpr[0];
-  if (pQueryAttr->numOfOutput == 1 && pExprInfo->base.functionId == TSDB_FUNC_TS_COMP && pQueryAttr->stableQuery) {
-    assert(pExprInfo->base.numOfParams == 1);
+  if (pQueryAttr->numOfOutput == 2 && pExprInfo->base.functionId == TSDB_FUNC_TS_COMP && pQueryAttr->stableQuery) {
+    assert(pExprInfo->base.numOfParams == 2);
 
-    int16_t      tagColId = (int16_t)pExprInfo->base.param[0].i64;
+    int16_t      tagColId = (int16_t)pExprInfo->base.param[1].i64;
     SColumnInfo* pColInfo = doGetTagColumnInfoById(pQueryAttr->tagColList, pQueryAttr->numOfTags, tagColId);
     GET_JSON_KEY(pExprInfo)
     doSetTagValueInParam(pTable, param, paramLen, tagColId, &pCtx[0].tag, pColInfo->type, pColInfo->bytes);
@@ -4019,21 +4019,21 @@ void setCtxTagForJoin(SQueryRuntimeEnv* pRuntimeEnv, SQLFunctionCtx* pCtx, SExpr
   if (pQueryAttr->stableQuery && (pRuntimeEnv->pTsBuf != NULL) &&
       (pExpr->functionId == TSDB_FUNC_TS || pExpr->functionId == TSDB_FUNC_PRJ) &&
       (pExpr->colInfo.colIndex == PRIMARYKEY_TIMESTAMP_COL_INDEX)) {
-    assert(pExpr->numOfParams == 1);
+    assert(pExpr->numOfParams == 2);
 
-    int16_t      tagColId = (int16_t)pExprInfo->base.param[0].i64;
+    int16_t      tagColId = (int16_t)pExprInfo->base.param[1].i64;
     SColumnInfo* pColInfo = doGetTagColumnInfoById(pQueryAttr->tagColList, pQueryAttr->numOfTags, tagColId);
 
     GET_JSON_KEY(pExprInfo)
     doSetTagValueInParam(pTable, param, paramLen, tagColId, &pCtx->tag, pColInfo->type, pColInfo->bytes);
 
     int16_t tagType = pCtx[0].tag.nType;
-    if (tagType == TSDB_DATA_TYPE_BINARY || tagType == TSDB_DATA_TYPE_NCHAR) {
+    if (tagType == TSDB_DATA_TYPE_BINARY || tagType == TSDB_DATA_TYPE_NCHAR || tagType == TSDB_DATA_TYPE_JSON) {
       qDebug("QInfo:0x%"PRIx64" set tag value for join comparison, colId:%" PRId64 ", val:%s", GET_QID(pRuntimeEnv),
-             pExprInfo->base.param[0].i64, pCtx[0].tag.pz);
+             pExprInfo->base.param[1].i64, pCtx[0].tag.pz);
     } else {
       qDebug("QInfo:0x%"PRIx64" set tag value for join comparison, colId:%" PRId64 ", val:%" PRId64, GET_QID(pRuntimeEnv),
-             pExprInfo->base.param[0].i64, pCtx[0].tag.i64);
+             pExprInfo->base.param[1].i64, pCtx[0].tag.i64);
     }
   }
 }
diff --git a/src/util/src/tcompare.c b/src/util/src/tcompare.c
index 8e9a1b90bcd7652b75fd2da601abb5d319f60634..59727d0584c4fd751bd81282a4bab07c8d848e9d 100644
--- a/src/util/src/tcompare.c
+++ b/src/util/src/tcompare.c
@@ -581,7 +581,8 @@ int32_t doCompare(const char* f1, const char* f2, int32_t type, size_t size) {
     case TSDB_DATA_TYPE_USMALLINT:  DEFAULT_COMP(GET_UINT16_VAL(f1), GET_UINT16_VAL(f2));
     case TSDB_DATA_TYPE_UINT:       DEFAULT_COMP(GET_UINT32_VAL(f1), GET_UINT32_VAL(f2));
     case TSDB_DATA_TYPE_UBIGINT:    DEFAULT_COMP(GET_UINT64_VAL(f1), GET_UINT64_VAL(f2));
-    case TSDB_DATA_TYPE_NCHAR: {
+    case TSDB_DATA_TYPE_NCHAR:
+    case TSDB_DATA_TYPE_JSON:{
       tstr* t1 = (tstr*) f1;
       tstr* t2 = (tstr*) f2;