[fix](Nereids) Make the case sensitivity of the result labels compatible with MySQL (#31510)

SQL: SELECT iD FROM t1
before the label was: id
after this PR the label will be: iD

fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/CheckAfterRewrite.java

@@ -107,9 +107,9 @@ public class CheckAfterRewrite extends OneAnalysisRuleFactory {
                 .collect(Collectors.toSet());
         notFromChildren = removeValidSlotsNotFromChildren(notFromChildren, childrenOutput);
         if (!notFromChildren.isEmpty()) {
-            if (plan.child(0) instanceof LogicalAggregate) {
+            if (plan.arity() != 0 && plan.child(0) instanceof LogicalAggregate) {
                 throw new AnalysisException(String.format("%s not in agg's output", notFromChildren
-                        .stream().map(slot -> slot.getName()).collect(Collectors.joining(", "))));
+                        .stream().map(NamedExpression::getName).collect(Collectors.joining(", "))));
             } else {
                 throw new AnalysisException(String.format(
                         "Input slot(s) not in child's output: %s in plan: %s,"

fe/fe-core/src/main/java/org/apache/doris/nereids/rules/analysis/SlotBinder.java

@@ -307,7 +307,9 @@ public class SlotBinder extends SubExprAnalyzer {
             //TODO: handle name parts more than three.
             throw new AnalysisException("Not supported name: "
                     + StringUtils.join(nameParts, "."));
-        }).collect(Collectors.toList());
+        })
+                .map(s -> s.withName(unboundSlot.getNameParts().get(unboundSlot.getNameParts().size() - 1)))
+                .collect(Collectors.toList());
     }
 
     public static boolean compareDbName(String boundedDbName, String unBoundDbName) {

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/ArrayItemReference.java

@@ -150,6 +150,16 @@ public class ArrayItemReference extends NamedExpression implements ExpectsInputT
             return new ArrayItemSlot(exprId, name, dataType, nullable);
         }
 
+        @Override
+        public ArrayItemSlot withName(String name) {
+            return new ArrayItemSlot(exprId, name, dataType, nullable);
+        }
+
+        @Override
+        public SlotReference withNullable(boolean newNullable) {
+            return new ArrayItemSlot(exprId, name, dataType, nullable);
+        }
+
         @Override
         public <R, C> R accept(ExpressionVisitor<R, C> visitor, C context) {
             return visitor.visitArrayItemSlot(this, context);

fe/fe-core/src/main/java/org/apache/doris/nereids/trees/expressions/MarkJoinSlotReference.java

@@ -73,4 +73,9 @@ public class MarkJoinSlotReference extends SlotReference implements SlotNotFromC
     public MarkJoinSlotReference withExprId(ExprId exprId) {
         return new MarkJoinSlotReference(exprId, name, existsHasAgg);
     }
+
+    @Override
+    public SlotReference withName(String name) {
+        return new MarkJoinSlotReference(exprId, name, existsHasAgg);
+    }
 }