/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.shardingsphere.core.rewrite.token.pojo;

import com.google.common.base.Optional;
import lombok.Getter;

/**
 * Aggregation distinct token.
 *
 * @author panjuan
 */
@Getter
public final class AggregationDistinctToken extends SQLToken implements Substitutable {
    
    private String columnName;
    
    private Optional<String> derivedAlias;
    
    private final int stopIndex;
    
    public AggregationDistinctToken(final int startIndex, final int stopIndex, final String columnName, final Optional<String> derivedAlias) {
        super(startIndex);
        this.columnName = columnName;
        this.derivedAlias = derivedAlias;
        this.stopIndex = stopIndex;
    }
}

@@ -860,48 +860,8 @@
 o;%0A%0A
-import com.google.common.base.Optional;%0A
 impo
@@ -1053,16 +1053,22 @@
 private 
+final 
 String c
@@ -1095,32 +1095,28 @@
 private 
-Optional%3C
+final 
 String
-%3E
  derived
@@ -1279,24 +1279,14 @@
 nal 
-Optional%3C
 String
-%3E
  der
@@ -1447,10 +1447,153 @@
 ;%0A    %7D%0A
+    %0A    @Override%0A    public String toString() %7B%0A        return null != derivedAlias ? columnName + %22 AS %22 + derivedAlias : columnName;%0A    %7D%0A
 %7D%0A

modify to String derivedAlias