Merge pull request #20360 from taosdata/fix/TD-23055

fix: all columns are invisiable in system table query

source/libs/nodes/src/nodesUtilFuncs.c

@@ -1462,7 +1462,7 @@ SListCell* nodesListErase(SNodeList* pList, SListCell* pCell) {
 }
 
 void nodesListInsertList(SNodeList* pTarget, SListCell* pPos, SNodeList* pSrc) {
-  if (NULL == pTarget || NULL == pPos || NULL == pSrc) {
+  if (NULL == pTarget || NULL == pPos || NULL == pSrc || NULL == pSrc->pHead) {
     return;
   }
 

source/libs/parser/src/parTranslater.c

@@ -2935,6 +2935,9 @@ static int32_t translateSelectList(STranslateContext* pCxt, SSelectStmt* pSelect
   if (TSDB_CODE_SUCCESS == code) {
     code = translateFillValues(pCxt, pSelect);
   }
+  if (NULL == pSelect->pProjectionList || 0 >= pSelect->pProjectionList->length) {
+    code = TSDB_CODE_PAR_INVALID_SELECTED_EXPR;
+  }
   return code;
 }