[Feature] 通过属性值(非主键属性)创建关系

[turkeymz]

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Feature Description (功能描述)

使用loader时，通过属性值(非主键属性)来创建关系会报

PARSE ERROR: Make sure the the primary key fields [id] are not empty, or check whether the headers or field_mapping are configured correctly

也就是说，loader必须使用主键关联来创建属性。所以希望添加标题的功能。 毕竟更多的场景，就是mysql中一张关联关系表，通过非主键id做的。这时候就无法快速导入

Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!

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