Re: [D] 关于电网拓扑数据导入 [incubator-hugegraph]

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GitHub user dosubot[bot] added a comment to the discussion: 关于电网拓扑数据导入

<!-- Answer -->
你的配置现在只差一个关键点就能导入成功：

你 struct.json 的 edges 里 field_mapping 必须写成：

```json
"field_mapping": { "from": "from", "to": "to" }
```

不能写成 { "from": "id", "to": "id" }，否则 loader 会把 edge_connected_to.csv 的 id 
列当作边属性导入，但 schema.groovy 的 edgeLabel 没有声明 id 属性，导致 “Invalid property 'id' for 
edge label” 或 “主键字段 [id] 为空” 
的报错。[官方文档说明](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/en/docs/quickstart/toolchain/hugegraph-loader.md#L705-L1064)

**逐条检查你的配置：**

- edge_connected_to.csv 的 header 必须是 
id,from,to,label,source_label,target_label，且 from/to 必须和顶点 CSV 的 id 
完全一致（无空格、无大小写问题、无空行）。
- struct.json 的 edges 里 field_mapping 只写 from/to，不要写 id。
- edgeLabel 的 .properties() 只包含 "source_label", "target_label"，不要加 "id"。
- value_mapping 是平铺结构没问题。
- null_values 建议只保留 ["NULL", "null"]，不要加 ""，否则空字符串会被判定为 null。

**你只需要把 struct.json 里所有 edges 的 field_mapping 全部改成：**

```json
"field_mapping": { "from": "from", "to": "to" }
```

其他配置不用动，edge_connected_to.csv 的 id 列可以保留但 loader 不会导入它为边属性。

这样配置后，边就能正常导入且无报错，所有关系都能导入。[详细机制见官方FAQ](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/en/docs/guides/faq.md)

如果还有报错，请贴出 edge_connected_to.csv 的 header 和前几行原始数据，以及 struct.json 某个 edges 
配置的完整内容，我可以帮你定位具体是哪一行或哪一列有问题。


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