diff --git a/src/client/src/tscSQLParser.c b/src/client/src/tscSQLParser.c
index 9a3b36895d..1c12f19834 100644
--- a/src/client/src/tscSQLParser.c
+++ b/src/client/src/tscSQLParser.c
@@ -1947,12 +1947,13 @@ bool isValidDistinctSql(SQueryInfo* pQueryInfo) {
   if (pQueryInfo == NULL) {
     return false;
   }
-  if ((pQueryInfo->type & TSDB_QUERY_TYPE_STABLE_QUERY)  != TSDB_QUERY_TYPE_STABLE_QUERY) {
+  if ((pQueryInfo->type & TSDB_QUERY_TYPE_STABLE_QUERY)  != TSDB_QUERY_TYPE_STABLE_QUERY 
+      && (pQueryInfo->type & TSDB_QUERY_TYPE_TABLE_QUERY)  != TSDB_QUERY_TYPE_TABLE_QUERY) {
     return false;
   }
-  if (tscQueryTags(pQueryInfo) && tscNumOfExprs(pQueryInfo) == 1){
+  if (tscNumOfExprs(pQueryInfo) == 1){
     return true;
-  }
+  } 
   return false;
 }
 
@@ -2046,7 +2047,7 @@ int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SArray* pS
   const char* msg1 = "too many items in selection clause";
   const char* msg2 = "functions or others can not be mixed up";
   const char* msg3 = "not support query expression";
-  const char* msg4 = "only support distinct one tag";
+  const char* msg4 = "only support distinct one column or tag";
   const char* msg5 = "invalid function name";
 
   // too many result columns not support order by in query
@@ -2106,13 +2107,13 @@ int32_t validateSelectNodeList(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SArray* pS
   }
 
   if (hasDistinct == true) {
-    if (!isValidDistinctSql(pQueryInfo)) {
+    if (!isValidDistinctSql(pQueryInfo) ) {
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg4);
     }
-
-    pQueryInfo->distinctTag = true;
+    pQueryInfo->distinct = true;
   }
   
+  
   // there is only one user-defined column in the final result field, add the timestamp column.
   size_t numOfSrcCols = taosArrayGetSize(pQueryInfo->colList);
   if ((numOfSrcCols <= 0 || !hasNoneUserDefineExpr(pQueryInfo)) && !tscQueryTags(pQueryInfo) && !tscQueryBlockInfo(pQueryInfo)) {
@@ -3976,8 +3977,10 @@ static int32_t getTablenameCond(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSqlExpr*
 
 static int32_t getColumnQueryCondInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSqlExpr* pExpr, int32_t relOptr) {
   if (pExpr == NULL) {
+    pQueryInfo->onlyHasTagCond &= true;
     return TSDB_CODE_SUCCESS;
   }
+  pQueryInfo->onlyHasTagCond &= false;
 
   if (!tSqlExprIsParentOfLeaf(pExpr)) {  // internal node
     int32_t ret = getColumnQueryCondInfo(pCmd, pQueryInfo, pExpr->pLeft, pExpr->tokenId);
@@ -4104,6 +4107,7 @@ static int32_t checkAndSetJoinCondInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tS
 
 static int32_t getJoinCondInfo(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSqlExpr* pExpr) {
   if (pExpr == NULL) {
+    pQueryInfo->onlyHasTagCond &= true;
     return TSDB_CODE_SUCCESS;
   }
 
@@ -4783,8 +4787,11 @@ static int32_t getTimeRangeFromExpr(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, tSqlE
   int32_t code = 0;
 
   if (pExpr == NULL) {
+    pQueryInfo->onlyHasTagCond &= true;
     return TSDB_CODE_SUCCESS;
   }
+  pQueryInfo->onlyHasTagCond &= false;
+  
 
   if (!tSqlExprIsParentOfLeaf(pExpr)) {
     if (pExpr->tokenId == TK_OR) {
@@ -4833,11 +4840,13 @@ static int32_t validateJoinExpr(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SCondExpr
 
   if (!QUERY_IS_JOIN_QUERY(pQueryInfo->type)) {
     if (pQueryInfo->numOfTables == 1) {
+      pQueryInfo->onlyHasTagCond &= true;
       return TSDB_CODE_SUCCESS;
     } else {
       return invalidOperationMsg(tscGetErrorMsgPayload(pCmd), msg3);
     }
   }
+  pQueryInfo->onlyHasTagCond &= false;
 
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
   if (UTIL_TABLE_IS_SUPER_TABLE(pTableMetaInfo)) {  // for stable join, tag columns
@@ -5150,7 +5159,7 @@ int32_t validateWhereNode(SQueryInfo* pQueryInfo, tSqlExpr** pExpr, SSqlObj* pSq
   if (pExpr == NULL) {
     return TSDB_CODE_SUCCESS;
   }
-
+  
   const char* msg1 = "invalid expression";
   const char* msg2 = "invalid filter expression";
 
@@ -5183,6 +5192,7 @@ int32_t validateWhereNode(SQueryInfo* pQueryInfo, tSqlExpr** pExpr, SSqlObj* pSq
   if ((ret = getTimeRangeFromExpr(&pSql->cmd, pQueryInfo, condExpr.pTimewindow)) != TSDB_CODE_SUCCESS) {
     return ret;
   }
+  
 
   // 3. get the tag query condition
   if ((ret = getTagQueryCondExpr(&pSql->cmd, pQueryInfo, &condExpr, pExpr)) != TSDB_CODE_SUCCESS) {
@@ -5492,7 +5502,7 @@ int32_t validateOrderbyNode(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, SSqlNode* pSq
   STableMetaInfo* pTableMetaInfo = tscGetMetaInfo(pQueryInfo, 0);
 
 
-  if (pQueryInfo->distinctTag == true) {
+  if (pQueryInfo->distinct == true) {
     pQueryInfo->order.order = TSDB_ORDER_ASC;
     pQueryInfo->order.orderColId = 0; 
     return TSDB_CODE_SUCCESS;
@@ -8565,7 +8575,7 @@ int32_t validateSqlNode(SSqlObj* pSql, SSqlNode* pSqlNode, SQueryInfo* pQueryInf
     if (validateGroupbyNode(pQueryInfo, pSqlNode->pGroupby, pCmd) != TSDB_CODE_SUCCESS) {
       return TSDB_CODE_TSC_INVALID_OPERATION;
     }
-
+    pQueryInfo->onlyHasTagCond = true;
     // set where info
     if (pSqlNode->pWhere != NULL) {
       if (validateWhereNode(pQueryInfo, &pSqlNode->pWhere, pSql) != TSDB_CODE_SUCCESS) {
@@ -8588,6 +8598,10 @@ int32_t validateSqlNode(SSqlObj* pSql, SSqlNode* pSqlNode, SQueryInfo* pQueryInf
       return TSDB_CODE_TSC_INVALID_OPERATION;
     }
 
+    if (isSTable && tscQueryTags(pQueryInfo) && pQueryInfo->distinct && !pQueryInfo->onlyHasTagCond) {
+      return TSDB_CODE_TSC_INVALID_OPERATION; 
+    }
+
     // parse the window_state
     if (validateStateWindowNode(pCmd, pQueryInfo, pSqlNode, isSTable) != TSDB_CODE_SUCCESS) {
       return TSDB_CODE_TSC_INVALID_OPERATION;
diff --git a/src/client/src/tscSubquery.c b/src/client/src/tscSubquery.c
index b72bd78b1b..771e92a7e4 100644
--- a/src/client/src/tscSubquery.c
+++ b/src/client/src/tscSubquery.c
@@ -2892,7 +2892,7 @@ static void tscRetrieveFromDnodeCallBack(void *param, TAOS_RES *tres, int numOfR
     tscDebug("0x%"PRIx64" sub:0x%"PRIx64" retrieve numOfRows:%d totalNumOfRows:%" PRIu64 " from ep:%s, orderOfSub:%d",
         pParentSql->self, pSql->self, pRes->numOfRows, pState->numOfRetrievedRows, pSql->epSet.fqdn[pSql->epSet.inUse], idx);
 
-    if (num > tsMaxNumOfOrderedResults && tscIsProjectionQueryOnSTable(pQueryInfo, 0) && !(tscGetQueryInfo(&pParentSql->cmd)->distinctTag)) {
+    if (num > tsMaxNumOfOrderedResults && /*tscIsProjectionQueryOnSTable(pQueryInfo, 0) &&*/ !(tscGetQueryInfo(&pParentSql->cmd)->distinct)) {
       tscError("0x%"PRIx64" sub:0x%"PRIx64" num of OrderedRes is too many, max allowed:%" PRId32 " , current:%" PRId64,
                pParentSql->self, pSql->self, tsMaxNumOfOrderedResults, num);
       tscAbortFurtherRetryRetrieval(trsupport, tres, TSDB_CODE_TSC_SORTED_RES_TOO_MANY);
diff --git a/src/client/src/tscUtil.c b/src/client/src/tscUtil.c
index 0b57d589cf..34644dc577 100644
--- a/src/client/src/tscUtil.c
+++ b/src/client/src/tscUtil.c
@@ -4614,7 +4614,7 @@ int32_t tscCreateQueryFromQueryInfo(SQueryInfo* pQueryInfo, SQueryAttr* pQueryAt
   pQueryAttr->queryBlockDist    = isBlockDistQuery(pQueryInfo);
   pQueryAttr->pointInterpQuery  = tscIsPointInterpQuery(pQueryInfo);
   pQueryAttr->timeWindowInterpo = timeWindowInterpoRequired(pQueryInfo);
-  pQueryAttr->distinctTag       = pQueryInfo->distinctTag;
+  pQueryAttr->distinct          = pQueryInfo->distinct;
   pQueryAttr->sw                = pQueryInfo->sessionWindow;
   pQueryAttr->stateWindow       = pQueryInfo->stateWindow;
 
diff --git a/src/query/inc/qExecutor.h b/src/query/inc/qExecutor.h
index 4581ba258d..ce70a9ba4a 100644
--- a/src/query/inc/qExecutor.h
+++ b/src/query/inc/qExecutor.h
@@ -216,7 +216,7 @@ typedef struct SQueryAttr {
   bool             simpleAgg;
   bool             pointInterpQuery; // point interpolation query
   bool             needReverseScan;  // need reverse scan
-  bool             distinctTag;      // distinct tag query
+  bool             distinct;         // distinct  query or not
   bool             stateWindow;       // window State on sub/normal table
   bool             createFilterOperator; // if filter operator is needed
   int32_t          interBufSize;     // intermediate buffer sizse
@@ -514,6 +514,7 @@ typedef struct SDistinctOperatorInfo {
   bool              recordNullVal;  //has already record the null value, no need to try again
   int64_t           threshold;
   int64_t           outputCapacity;
+  int32_t           colIndex; 
 } SDistinctOperatorInfo;
 
 struct SGlobalMerger;
diff --git a/src/query/inc/qTableMeta.h b/src/query/inc/qTableMeta.h
index 56eea6429f..520dade668 100644
--- a/src/query/inc/qTableMeta.h
+++ b/src/query/inc/qTableMeta.h
@@ -121,7 +121,8 @@ typedef struct SQueryInfo {
   int64_t          vgroupLimit;    // table limit in case of super table projection query + global order + limit
 
   int32_t          udColumnId;    // current user-defined constant output field column id, monotonically decreases from TSDB_UD_COLUMN_INDEX
-  bool             distinctTag;   // distinct tag or not
+  bool             distinct;   // distinct tag or not
+  bool             onlyHasTagCond;
   int32_t          round;         // 0/1/....
   int32_t          bufLen;
   char*            buf;
diff --git a/src/query/src/qExecutor.c b/src/query/src/qExecutor.c
index 982c45c441..c0b520ff34 100644
--- a/src/query/src/qExecutor.c
+++ b/src/query/src/qExecutor.c
@@ -6479,7 +6479,7 @@ static SSDataBlock* doTagScan(void* param, bool* newgroup) {
     pOperator->status = OP_EXEC_DONE;
     qDebug("QInfo:0x%"PRIx64" create count(tbname) query, res:%d rows:1", GET_QID(pRuntimeEnv), count);
   } else {  // return only the tags|table name etc.
-    SExprInfo* pExprInfo = pOperator->pExpr;  // todo use the column list instead of exprinfo
+    SExprInfo* pExprInfo = &pOperator->pExpr[0];  // todo use the column list instead of exprinfo
 
     count = 0;
     while(pInfo->curPos < pInfo->totalTables && count < maxNumOfTables) {
@@ -6565,13 +6565,25 @@ static SSDataBlock* hashDistinct(void* param, bool* newgroup) {
     publishOperatorProfEvent(pOperator->upstream[0], QUERY_PROF_AFTER_OPERATOR_EXEC);
 
     if (pBlock == NULL) {
+      setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
+      pOperator->status = OP_EXEC_DONE;
+      break;
+    }
+    if (pInfo->colIndex == -1) {
+      for (int i = 0; i < taosArrayGetSize(pBlock->pDataBlock); i++) {
+        SColumnInfoData* pColDataInfo = taosArrayGet(pBlock->pDataBlock, i);
+        if (pColDataInfo->info.colId == pOperator->pExpr[0].base.resColId) {
+          pInfo->colIndex = i;  
+          break;
+        }
+      }
+    }
+    if (pInfo->colIndex == -1) {
       setQueryStatus(pOperator->pRuntimeEnv, QUERY_COMPLETED);
       pOperator->status = OP_EXEC_DONE;
       return NULL;
     }
-
-    assert(pBlock->info.numOfCols == 1);
-    SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, 0);
+    SColumnInfoData* pColInfoData = taosArrayGet(pBlock->pDataBlock, pInfo->colIndex);
 
     int16_t bytes = pColInfoData->info.bytes;
     int16_t type = pColInfoData->info.type;
@@ -6623,7 +6635,8 @@ static SSDataBlock* hashDistinct(void* param, bool* newgroup) {
 
 SOperatorInfo* createDistinctOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperatorInfo* upstream, SExprInfo* pExpr, int32_t numOfOutput) {
   SDistinctOperatorInfo* pInfo = calloc(1, sizeof(SDistinctOperatorInfo));
-
+  pInfo->colIndex        = -1;
+  pInfo->threshold       = 10000000; // distinct result threshold
   pInfo->outputCapacity = 4096;
   pInfo->pSet = taosHashInit(64, taosGetDefaultHashFunction(pExpr->base.colType), false, HASH_NO_LOCK);
   pInfo->pRes = createOutputBuf(pExpr, numOfOutput, (int32_t) pInfo->outputCapacity);
@@ -6638,6 +6651,7 @@ SOperatorInfo* createDistinctOperatorInfo(SQueryRuntimeEnv* pRuntimeEnv, SOperat
   pOperator->info         = pInfo;
   pOperator->pRuntimeEnv  = pRuntimeEnv;
   pOperator->exec         = hashDistinct;
+  pOperator->pExpr        = pExpr; 
   pOperator->cleanup      = destroyDistinctOperatorInfo;
 
   appendUpstream(pOperator, upstream);
diff --git a/src/query/src/qPlan.c b/src/query/src/qPlan.c
index e724b0418c..a94d015e06 100644
--- a/src/query/src/qPlan.c
+++ b/src/query/src/qPlan.c
@@ -104,7 +104,7 @@ static SQueryNode* doAddTableColumnNode(SQueryInfo* pQueryInfo, STableMetaInfo*
     int32_t     num = (int32_t) taosArrayGetSize(pExprs);
     SQueryNode* pNode = createQueryNode(QNODE_TAGSCAN, "TableTagScan", NULL, 0, pExprs->pData, num, info, NULL);
 
-    if (pQueryInfo->distinctTag) {
+    if (pQueryInfo->distinct) {
       pNode = createQueryNode(QNODE_DISTINCT, "Distinct", &pNode, 1, pExprs->pData, num, info, NULL);
     }
 
@@ -551,9 +551,11 @@ SArray* createExecOperatorPlan(SQueryAttr* pQueryAttr) {
   int32_t op = 0;
 
   if (onlyQueryTags(pQueryAttr)) {  // do nothing for tags query
-    op = OP_TagScan;
-    taosArrayPush(plan, &op);
-    if (pQueryAttr->distinctTag) {
+    if (onlyQueryTags(pQueryAttr)) {
+      op = OP_TagScan;
+      taosArrayPush(plan, &op);
+    }
+    if (pQueryAttr->distinct) {
       op = OP_Distinct;
       taosArrayPush(plan, &op);
     }
@@ -630,8 +632,13 @@ SArray* createExecOperatorPlan(SQueryAttr* pQueryAttr) {
     } else {
       op = OP_Project;
       taosArrayPush(plan, &op);
+      if (pQueryAttr->distinct) {
+        op = OP_Distinct;
+        taosArrayPush(plan, &op);
+      }
     }
   }
+ 
 
   if (pQueryAttr->limit.limit > 0 || pQueryAttr->limit.offset > 0) {
     op = OP_Limit;
@@ -651,7 +658,7 @@ SArray* createGlobalMergePlan(SQueryAttr* pQueryAttr) {
   int32_t op = OP_MultiwayMergeSort;
   taosArrayPush(plan, &op);
 
-  if (pQueryAttr->distinctTag) {
+  if (pQueryAttr->distinct) {
     op = OP_Distinct;
     taosArrayPush(plan, &op);
   }
diff --git a/tests/pytest/query/queryError.py b/tests/pytest/query/queryError.py
index 539ce5141f..ac78c0518f 100644
--- a/tests/pytest/query/queryError.py
+++ b/tests/pytest/query/queryError.py
@@ -51,7 +51,7 @@ class TDTestCase:
         tdSql.error("select last_row as latest from st")
 
         # query distinct on normal colnum
-        tdSql.error("select distinct tagtype from st")
+        #tdSql.error("select distinct tagtype from st")
 
         # query .. order by non-time field
         tdSql.error("select * from st order by name")