Github user zentol commented on the pull request:
https://github.com/apache/flink/pull/1024#issuecomment-131512254
i don't think these statements are equivalent.
Assume that this.state == null and that.state != null.
In the original version we evaluate that.state == null, which is False, so
the overall result is False.
In your version we would evaluate (this.state == null ||
this.state.equals(that.state)), which is True, making the overall result true.
Unless i made a mistake, -1.
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