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我有一个数学表达式 ($field_a - $field_b),我想为 (select-list) 创建一个公开的分组过滤器,以便我可以有效地过滤掉我的结果。
如何进行设置,以便用户根据两个字段的值获得两个选项?
为此,我最终创建了一个自定义字段处理程序。