GraphQl Calculator 计算指令 @distinct：使用表达式对列表进行去重

directive @distinct(comparator:String) on FIELD

query distinctUserInfoListByAge($userIds:[Int]){    consumer{        distinctUserInfoList: userInfoList(userIds: $userIds)        @distinct(comparator: "age")        {            userId            name            age            email        }    }}

public interface AsyncDataFetcherInterface<T> {
    /**     * Return the dataFetcher which async dataFetcher wrapped.     *     * @return the dataFetcher which async dataFetcher wrapped     */    DataFetcher<T> getWrappedDataFetcher();
    /**     * Return the {@code Executor} which async dataFetcher used.     *     * @return the {@code Executor} which async dataFetcher used     */    Executor getExecutor();}

Config wrapperConfig = DefaultConfig.newConfig().build();DefaultGraphQLSourceBuilder graphqlSourceBuilder = new DefaultGraphQLSourceBuilder();GraphQLSource graphqlSource = graphqlSourceBuilder        .wrapperConfig(wrapperConfig)        .originalSchema(GraphQLSourceHolder.getDefaultSchema())        .preparsedDocumentProvider(new DocumentParseAndValidationCache()).build();