@@ -0,0 +1,1807 @@
+/*%0A * Copyright 2016-2018 shardingsphere.io.%0A * %3Cp%3E%0A * Licensed under the Apache License, Version 2.0 (the %22License%22);%0A * you may not use this file except in compliance with the License.%0A * You may obtain a copy of the License at%0A *%0A *     http://www.apache.org/licenses/LICENSE-2.0%0A *%0A * Unless required by applicable law or agreed to in writing, software%0A * distributed under the License is distributed on an %22AS IS%22 BASIS,%0A * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.%0A * See the License for the specific language governing permissions and%0A * limitations under the License.%0A * %3C/p%3E%0A */%0A%0Apackage io.shardingsphere.core.parsing.parser.context.selectitem;%0A%0Aimport com.google.common.base.Optional;%0Aimport io.shardingsphere.core.constant.AggregationType;%0Aimport io.shardingsphere.core.util.SQLUtil;%0Aimport lombok.EqualsAndHashCode;%0Aimport lombok.Getter;%0Aimport lombok.RequiredArgsConstructor;%0Aimport lombok.Setter;%0Aimport lombok.ToString;%0A%0Aimport java.util.ArrayList;%0Aimport java.util.List;%0A%0A/**%0A * Distinct select item.%0A *%0A * @author panjuan%0A */%0A@RequiredArgsConstructor%0A@Getter%0A@EqualsAndHashCode%0A@ToString%0Apublic final class DistinctSelectItem implements SelectItem %7B%0A    %0A    private final AggregationType type;%0A    %0A    private final String innerExpression;%0A    %0A    private final Optional%3CString%3E alias;%0A    %0A    private final List%3CDistinctSelectItem%3E derivedAggregationSelectItems = new ArrayList%3C%3E(2);%0A    %0A    @Setter%0A    private int index = -1;%0A    %0A    @Override%0A    public String getExpression() %7B%0A        return SQLUtil.getExactlyValue(type.name() + innerExpression);%0A    %7D%0A    %0A    /**%0A     * Get column label.%0A     *%0A     * @return column label%0A     */%0A    public String getColumnLabel() %7B%0A        return alias.isPresent() ? alias.get() : getExpression();%0A    %7D%0A%7D%0A

add DistinctSelectItem