Jasper reports Jasper报告删除/隐藏空组

背景：Jaspersoft studio 6

有以下交叉表：

    select 'prod1' as prod, 'mon1' as month, 1 as val
    union all select 'prod1' as prod, 'mon2' as month, 1 as val
    union all select 'prod2' as prod, 'mon1' as month, 1 as val
    union all select 'prod2' as prod, 'mon2' as month, 1 as val
    union all select 'prod3' as prod, null as month, null as val

交叉表的数据集：

    select 'prod1' as prod, 'mon1' as month, 1 as val
    union all select 'prod1' as prod, 'mon2' as month, 1 as val
    union all select 'prod2' as prod, 'mon1' as month, 1 as val
    union all select 'prod2' as prod, 'mon2' as month, 1 as val
    union all select 'prod3' as prod, null as month, null as val

问题：正如您可能已经注意到的，prod3没有与mon1或mon2相关的数据。但我仍然需要它在报告中显示出来。因此，Jasper创建了空列。如何删除空列？我尝试过空时为空或删除行时为空在不同的地方，但没有任何工作。即使在某个时候，我也可以去掉空文本，但是单元格仍然被渲染，所以边框和背景颜色仍然显示出来

以及源文件（只是一个包含一个行组和一个列组的交叉表）：

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好的，问题解决了。与Jasper无关（这是一个很好的工具，但老实说，它只是缺少一些功能）。解决方案就是给prod3一个列组和0值。关键是任何组字段都没有空值，因此Jasper无法生成空组。对于这种情况，只需给出任何现有组成员（mon1或mon2）的prod3值和0值。对于一个真实的例子，必须有一些sql混乱来实现这一点，但这比用jasper进行黑客攻击要容易得多

    select 'prod1' as prod, 'mon1' as month, 1 as val
        union all select 'prod1' as prod, 'mon2' as month, 1 as val
        union all select 'prod2' as prod, 'mon1' as month, 1 as val
        union all select 'prod2' as prod, 'mon2' as month, 1 as val
        union all select 'prod3' as prod, 'mon1' as month, 0 as val

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在sql或java级别进行过滤怎么样？你的意思是什么？我不想过滤掉prod3，我希望它出现在报告中，只显示mon1和mon2的0。