Can't remove non-null vertex property
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bug
- Dominant language
- Java
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Description
### Expected behavior 期望表现
成功删除已经设置nullableKeys的属性
### Actual behavior 实际表现
删除顶点属性时报错:
Can't remove non-null vertex property 'vp[c_label->2:194]'
发现包含有label为空的顶点:
`g.V().filter{ it.get().label() == "" }`
报错时语句:
`g.V().hasLabel('c_label').drop()`
`g.V().properties('c_label').drop()`
删除属性报错等价语句:
`g.V().filter{ it.get().label() == "" }.properties().limit(1).drop()`
### Specifications of environment 环境信息
- hugegraph version: v0.7.4
- operating system: centos 6.3
- hugegraph backend: rocksdb
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