Merge pull request #20724 from taosdata/fix/main_bugfix_wxy

fix: error in optimizing useless columns for multi-level set operators

source/libs/parser/src/parCalcConst.c

@@ -337,8 +337,14 @@ static SNodeList* getChildProjection(SNode* pStmt) {
 static void eraseSetOpChildProjection(SSetOperator* pSetOp, int32_t index) {
   SNodeList* pLeftProjs = getChildProjection(pSetOp->pLeft);
   nodesListErase(pLeftProjs, nodesListGetCell(pLeftProjs, index));
+  if (QUERY_NODE_SET_OPERATOR == nodeType(pSetOp->pLeft)) {
+    eraseSetOpChildProjection((SSetOperator*)pSetOp->pLeft, index);
+  }
   SNodeList* pRightProjs = getChildProjection(pSetOp->pRight);
   nodesListErase(pRightProjs, nodesListGetCell(pRightProjs, index));
+  if (QUERY_NODE_SET_OPERATOR == nodeType(pSetOp->pRight)) {
+    eraseSetOpChildProjection((SSetOperator*)pSetOp->pRight, index);
+  }
 }
 
 typedef struct SNotRefByOrderByCxt {