[fix](fe) Preserve operative slots when deep copying logical relations

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/copier/LogicalPlanDeepCopier.java

@@ -482,7 +482,7 @@ private void updateReplaceMapWithOutput(Plan oldPlan, Plan newPlan, Map<ExprId,
     private Plan updateOperativeSlots(LogicalCatalogRelation oldRelation, LogicalCatalogRelation newRelation) {
         List<Slot> oldOperativeSlots = oldRelation.getOperativeSlots();
         List<Slot> newOperativeSlots = new ArrayList<>(oldOperativeSlots.size());
-        int outputSize = oldOperativeSlots.size();
+        int outputSize = oldRelation.getOutput().size();
         for (Slot opSlot : oldOperativeSlots) {
             int idx;
             for (idx = 0; idx < outputSize; idx++) {

fe/fe-core/src/test/java/org/apache/doris/nereids/trees/copier/LogicalPlanDeepCopierTest.java

@@ -50,6 +50,17 @@ public void testDeepCopyOlapScan() {
         }
     }
 
+    @Test
+    public void testDeepCopyOlapScanWithNonFirstOperativeSlot() {
+        LogicalOlapScan relationPlan = PlanConstructor.newLogicalOlapScan(0, "a", 0);
+        relationPlan = (LogicalOlapScan) relationPlan.withOperativeSlots(
+                ImmutableList.of(relationPlan.getOutput().get(1)));
+        LogicalOlapScan aCopy =
+                (LogicalOlapScan) relationPlan.accept(LogicalPlanDeepCopier.INSTANCE, new DeepCopierContext());
+
+        Assertions.assertEquals(ImmutableList.of(aCopy.getOutput().get(1)), aCopy.getOperativeSlots());
+    }
+
     @Test
     public void testDeepCopyAggregateWithSourceRepeat() {
         LogicalOlapScan scan = PlanConstructor.newLogicalOlapScan(0, "t", 0);