fix nchar duplicated converted issue

src/client/inc/tsclient.h

@@ -307,6 +307,7 @@ typedef struct {
   char *         data;
   TAOS_ROW       tsrow;
   TAOS_ROW       urow;
+  bool           dataConverted;
   int32_t*       length;  // length for each field for current row
   char **        buffer;  // Buffer used to put multibytes encoded using unicode (wchar_t)
   SColumnIndex*  pColumnIndex;
@@ -439,7 +440,7 @@ int32_t tscTansformFuncForSTableQuery(SQueryInfo *pQueryInfo);
 void    tscRestoreFuncForSTableQuery(SQueryInfo *pQueryInfo);
 
 int32_t tscCreateResPointerInfo(SSqlRes *pRes, SQueryInfo *pQueryInfo);
-void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo);
+void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo, bool converted);
 void tscSetResRawPtrRv(SSqlRes* pRes, SQueryInfo* pQueryInfo, SSDataBlock* pBlock, bool convertNchar);
 
 void handleDownstreamOperator(SSqlObj** pSqlList, int32_t numOfUpstream, SQueryInfo* px, SSqlObj* pParent);

src/client/src/tscServer.c

@@ -1892,7 +1892,7 @@ static int tscLocalResultCommonBuilder(SSqlObj *pSql, int32_t numOfRes) {
       return pRes->code;
     }
 
-    tscSetResRawPtr(pRes, pQueryInfo);
+    tscSetResRawPtr(pRes, pQueryInfo, pRes->dataConverted);
   } else {
     tscResetForNextRetrieve(pRes);
   }
@@ -2807,7 +2807,7 @@ int tscProcessRetrieveRspFromNode(SSqlObj *pSql) {
       (tscNonOrderedProjectionQueryOnSTable(pQueryInfo, 0) &&
        !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_QUERY) &&
        !TSDB_QUERY_HAS_TYPE(pQueryInfo->type, TSDB_QUERY_TYPE_JOIN_SEC_STAGE))) {
-    tscSetResRawPtr(pRes, pQueryInfo);
+    tscSetResRawPtr(pRes, pQueryInfo, pRes->dataConverted);
   }
 
   if (pSql->pSubscription != NULL) {

src/client/src/tscSubquery.c

@@ -3448,6 +3448,8 @@ static void doBuildResFromSubqueries(SSqlObj* pSql) {
     char* pData = getResultBlockPosition(pCmd1, pRes1, pIndex->columnIndex, &bytes);
     memcpy(data, pData, bytes * numOfRes);
 
+    pRes->dataConverted = pRes1->dataConverted;
+
     data += bytes * numOfRes;
   }
 
@@ -3473,7 +3475,7 @@ static void doBuildResFromSubqueries(SSqlObj* pSql) {
   doArithmeticCalculate(pQueryInfo, pFilePage, rowSize, finalRowSize);
 
   pRes->data = pFilePage->data;
-  tscSetResRawPtr(pRes, pQueryInfo);
+  tscSetResRawPtr(pRes, pQueryInfo, pRes->dataConverted);
 }
 
 void tscBuildResFromSubqueries(SSqlObj *pSql) {

src/client/src/tscUtil.c

@@ -690,9 +690,13 @@ static void setResRawPtrImpl(SSqlRes* pRes, SInternalField* pInfo, int32_t i, bo
 
     memcpy(pRes->urow[i], pRes->buffer[i], pInfo->field.bytes * pRes->numOfRows);
   }
+
+  if (convertNchar) {
+    pRes->dataConverted = true;
+  }
 }
 
-void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo) {
+void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo, bool converted) {
   assert(pRes->numOfCols > 0);
   if (pRes->numOfRows == 0) {
     return;
@@ -705,7 +709,7 @@ void tscSetResRawPtr(SSqlRes* pRes, SQueryInfo* pQueryInfo) {
     pRes->length[i] = pInfo->field.bytes;
 
     offset += pInfo->field.bytes;
-    setResRawPtrImpl(pRes, pInfo, i, true);
+    setResRawPtrImpl(pRes, pInfo, i, converted ? false : true);
   }
 }