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，但你还遗漏了最核心的地方：

**你的 struct.json 里所有 edges 的 field_mapping 必须写成：**
```json
"field_mapping": { "from": "from", "to": "to" }
```
而且 **不能写成** `{ "from": "id", "to": "id" }` 或 `{ "from": "id", "to": "id", ... 
}`，否则 loader 会把 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)

**你现在遇到的 “Make sure the primary key fields [id] are not empty, or check whether 
the headers or field_mapping are configured correctly” 报错，根本原因是：**
- 你的顶点主键是 id（vertex_xxx.csv 里有 id 列，schema 里 primaryKeys("id")），loader 只会用 
from/to 字段的值直接作为顶点主键 id，不会再去查 vertex_xxx.csv 的其他字段。
- edge_connected_to.csv 的 id 列可以保留，但 loader 不会导入它为边属性，只要 field_mapping 不写 id 
就不会报错。
- edgeLabel 的 .properties() 只包含 "source_label", "target_label"，不要加 "id"。
- value_mapping 必须是平铺结构（你现在的写法没问题）。
- null_values 建议只保留 ["NULL", "null"]，不要加 ""，否则空字符串会被判定为 null。

**请你务必检查：**
1. struct.json 里所有 edges 的 field_mapping 都是 `"field_mapping": { "from": "from", 
"to": "to" }`，没有任何 id。
2. edge_connected_to.csv 的 from/to 字段和所有顶点 id 完全一致（无多余空格、无大小写问题、无空行）。
3. struct.json 的 null_values 只保留 ["NULL", "null"]，不要加 ""。
4. edgeLabel 的 .properties() 只包含 "source_label", "target_label"，不要加 "id"。
5. 你可以加 `"selected": ["from", "to"]` 显式指定用到的字段，避免 loader 解析其它无关列。

**如果还有报错，请贴出 power_edges_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。**

只要这几点全部做到，边就能正常导入且无报错，所有关系都能导入。[官方FAQ说明](https://github.com/apache/incubator-hugegraph-doc/blob/master/content/en/docs/guides/faq.md)


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