dosubot[bot] commented on issue #2733:
URL:
https://github.com/apache/incubator-hugegraph/issues/2733#issuecomment-2667397004
<!-- Answer -->
To delete edge properties in HugeGraph when you encounter an error
indicating that non-null edge properties cannot be removed, you need to ensure
that the property is defined as nullable in the edge label schema. The error
occurs because the property is not listed as nullable. Here's how you can
resolve this:
1. **Check the Edge Label Schema**: Verify if the property you want to
remove is defined as nullable. If not, you need to update the schema.
2. **Update the Schema**: Use the `nullableKeys` method of the
`EdgeLabelBuilder` class to make the property nullable. Here's an example:
```java
EdgeLabelBuilder edgeLabelBuilder = new EdgeLabelBuilder(transaction,
graph, "edgeLabelName");
edgeLabelBuilder.nullableKeys("since");
EdgeLabel edgeLabel = edgeLabelBuilder.append();
```
3. **Retry the Operation**: Once the schema is updated to make the property
nullable, you should be able to remove the property without encountering the
error.
This approach ensures that the property can be removed without violating the
schema constraints
<sup>[[1]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/structure/HugeEdgeProperty.java)</sup><sup>[[2]](https://github.com/apache/incubator-hugegraph/blob/master/hugegraph-server/hugegraph-core/src/main/java/org/apache/hugegraph/schema/builder/EdgeLabelBuilder.java)</sup>.
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