[TD-14572]<fix>: fix char_length result when nchar column has chinese characters

source/libs/executor/src/executorimpl.c

@@ -1264,19 +1264,10 @@ static void projectApplyFunctions(SExprInfo* pExpr, SSDataBlock* pResult, SSData
 
       pResult->info.rows = pCtx[0].input.numOfRows;
     } else if (pExpr[k].pExpr->nodeType == QUERY_NODE_VALUE) {
-      SVariant *pVal = pExpr[k].pExpr->pVal;
-      char *payload;
-      if (IS_VAR_DATA_TYPE(pVal->nType)) {
-        payload = taosMemoryCalloc(1, pVal->nLen + VARSTR_HEADER_SIZE);
-      } else {
-        payload = taosMemoryCalloc(1, tDataTypes[pVal->nType].bytes);
-      }
-      taosVariantDump(pVal, payload, pVal->nType, true);
       SColumnInfoData* pColInfoData = taosArrayGet(pResult->pDataBlock, k);
       for (int32_t i = 0; i < pSrcBlock->info.rows; ++i) {
-        colDataAppend(pColInfoData, i, payload, false);
+        colDataAppend(pColInfoData, i, taosVariantGet(&pExpr[k].base.pParam[0].param, pExpr[k].base.pParam[0].param.nType), TSDB_DATA_TYPE_NULL == pExpr[k].base.pParam[0].param.nType);
       }
-      taosMemoryFree(payload);
       pResult->info.rows = pSrcBlock->info.rows;
     } else if (pExpr[k].pExpr->nodeType == QUERY_NODE_OPERATOR) {
       SArray* pBlockList = taosArrayInit(4, POINTER_BYTES);
@@ -1322,12 +1313,6 @@ static void projectApplyFunctions(SExprInfo* pExpr, SSDataBlock* pResult, SSData
         pResult->info.rows = dest.numOfRows;
         taosArrayDestroy(pBlockList);
       }
-    } else if (pExpr[k].pExpr->nodeType == QUERY_NODE_VALUE) {
-      SColumnInfoData* pColInfoData = taosArrayGet(pResult->pDataBlock, k);
-      for (int32_t i = 0; i < pSrcBlock->info.rows; ++i) {
-        colDataAppend(pColInfoData, i, taosVariantGet(&pExpr[k].base.pParam[0].param, pExpr[k].base.pParam[0].type), TSDB_DATA_TYPE_NULL == pExpr[k].base.pParam[0].param.nType);
-      }
-      pResult->info.rows = pSrcBlock->info.rows;
     } else {
       ASSERT(0);
     }
@@ -6976,15 +6961,16 @@ SExprInfo* createExprInfo(SNodeList* pNodeList, SNodeList* pGroupKeys, int32_t*
       pExp->base.pParam[0].pCol = createColumn(pColNode->dataBlockId, pColNode->slotId, pType);
       pExp->base.pParam[0].type = FUNC_PARAM_TYPE_COLUMN;
     } else if (nodeType(pTargetNode->pExpr) == QUERY_NODE_VALUE) {
-      pExp->pExpr->nodeType  = QUERY_NODE_VALUE;
-      SValueNode* pValueNode = (SValueNode*)pTargetNode->pExpr;
-      SDataType* pType = &pValueNode->node.resType;
-      char *pDatum = nodesGetValueFromNode(pValueNode);
-      if (IS_VAR_DATA_TYPE(pType->type)) {
-        pDatum = varDataVal(pDatum);
-      }
-      pExp->pExpr->pVal = taosMemoryCalloc(1, sizeof(SVariant));
-      taosVariantCreateFromBinary(pExp->pExpr->pVal, pDatum, pType->bytes, pType->type);
+      pExp->pExpr->nodeType = QUERY_NODE_VALUE;
+      SValueNode* pValNode = (SValueNode*)pTargetNode->pExpr;
+
+      pExp->base.pParam = taosMemoryCalloc(1, sizeof(SFunctParam));
+      pExp->base.numOfParams = 1;
+
+      SDataType* pType = &pValNode->node.resType;
+      pExp->base.resSchema = createResSchema(pType->type, pType->bytes, pTargetNode->slotId, pType->scale, pType->precision, pValNode->node.aliasName);
+      pExp->base.pParam[0].type = FUNC_PARAM_TYPE_VALUE;
+      valueNodeToVariant(pValNode, &pExp->base.pParam[0].param);
     } else if (nodeType(pTargetNode->pExpr) == QUERY_NODE_FUNCTION) {
       pExp->pExpr->nodeType = QUERY_NODE_FUNCTION;
       SFunctionNode* pFuncNode = (SFunctionNode*)pTargetNode->pExpr;
@@ -7030,16 +7016,6 @@ SExprInfo* createExprInfo(SNodeList* pNodeList, SNodeList* pGroupKeys, int32_t*
 //      pExp->base.pParam[0].type = FUNC_PARAM_TYPE_COLUMN;
 //      pExp->base.pParam[0].pCol = createColumn(pTargetNode->dataBlockId, pTargetNode->slotId, pType);
     } else if (nodeType(pTargetNode->pExpr) == QUERY_NODE_VALUE) {
-      pExp->pExpr->nodeType = QUERY_NODE_VALUE;
-      SValueNode* pValNode = (SValueNode*)pTargetNode->pExpr;
-
-      pExp->base.pParam = taosMemoryCalloc(1, sizeof(SFunctParam));
-      pExp->base.numOfParams = 1;
-
-      SDataType* pType = &pValNode->node.resType;
-      pExp->base.resSchema = createResSchema(pType->type, pType->bytes, pTargetNode->slotId, pType->scale, pType->precision, pValNode->node.aliasName);
-      pExp->base.pParam[0].type = FUNC_PARAM_TYPE_VALUE;
-      valueNodeToVariant(pValNode, &pExp->base.pParam[0].param);
     } else {
       ASSERT(0);
     }