在一个隐藏的相关字段上面不能是一个自定义分组字段。
Field above a hidden context field can not be a custom group field.
对于该新功能，需要在消息描述符中附加字段来保留分段和分组信息。
For this new function, additional fields in message descriptor were needed to keep information for the segmenting and grouping.
稍后，会将这些字段分组到相应的表中，并应用标准化的规则来压缩该模式。
Later you'll group these fields into the appropriate tables and apply the rules of normalization to tighten the schema.
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