mybatis collectioin结果集为List＜String＞

mybatis collectioin结果集为List

    <resultMap id="supplierReportResultVOMap" type="com.icourt.administration.inventory.vo.SupplierReportResultVO">
        <result column="supplier_name" property="supplierName" />
        <result column="total_count" property="totalCount" />
        <result column="total_amount" property="totalAmount" />
        <result column="category_count" property="categoryCount" />
        <result column="dispose_count" property="disposeCount" />
        <result column="dispose_amount" property="disposeAmount" />
        <collection property="materialIds" ofType="string">
            <result column="material_id"/>
        </collection>
    </resultMap>

collection还有去重的作用

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