Github user yanghua commented on the issue:
https://github.com/apache/flink/pull/6165
@zentol the field `vertexCount` and `uniformlyDistributedScore` been
initialized in open function. if `vertexCount` was set to default value (0). I
think `uniformlyDistributedScore` keeps default value is OK, otherwise it would
throw an error. if `vertexCount` is not zero, the `uniformlyDistributedScore`
would be calculated accurately.---
