fix: backport last expr fix from develop branch

src/client/src/tscSQLParser.c

@@ -2934,7 +2934,7 @@ int32_t addExprAndResultField(SSqlCmd* pCmd, SQueryInfo* pQueryInfo, int32_t col
     case TSDB_FUNC_LAST:
     case TSDB_FUNC_SPREAD:
     case TSDB_FUNC_LAST_ROW:
-    case TSDB_FUNC_INTERP: {
+    case TSDB_FUNC_INTERP: { // link to TD-14196, if add FUNC in this place, please search TD-14196, because there are connection in exprTreeFromSql
       bool requireAllFields = (pItem->pNode->Expr.paramList == NULL);
 
       // NOTE: has time range condition or normal column filter condition, the last_row query will be transferred to last query
@@ -10366,7 +10366,17 @@ int32_t exprTreeFromSqlExpr(SSqlCmd* pCmd, tExprNode **pExpr, const tSqlExpr* pS
       *pExpr = calloc(1, sizeof(tExprNode));
       (*pExpr)->nodeType = TSQL_NODE_COL;
       (*pExpr)->pSchema = calloc(1, sizeof(SSchema));
+      if (tsKeepOriginalColumnName &&   // TD-14196, tsKeepOriginalColumnName params makes logic special
+          (pSqlExpr->functionId == TSDB_FUNC_FIRST ||
+           pSqlExpr->functionId == TSDB_FUNC_LAST ||
+           pSqlExpr->functionId == TSDB_FUNC_SPREAD ||
+           pSqlExpr->functionId == TSDB_FUNC_LAST_ROW ||
+           pSqlExpr->functionId == TSDB_FUNC_INTERP)) {
+        tSqlExprItem* pParamElem = taosArrayGet(pSqlExpr->Expr.paramList, 0);
+        strncpy((*pExpr)->pSchema->name, pParamElem->pNode->columnName.z, pParamElem->pNode->columnName.n);
+      }else{
         strncpy((*pExpr)->pSchema->name, pSqlExpr->exprToken.z, pSqlExpr->exprToken.n);
+      }
 
       // set the input column data byte and type.
       size_t size = taosArrayGetSize(pQueryInfo->exprList);