Github user wenlong88 commented on the issue:
https://github.com/apache/flink/pull/3595
@greghogan Thanks for the review. I have add non-negative check and update
the test with ExpectedException. But I don't think we need to call toString in
the test since we have check the position instead I add a test to verify that
toString returns the substring with range(0, position) to meet your concern.
One update about setPosition in outputStream, I think it is better to auto
extend the buffer when setting a position larger than the buffer size, just
like the auto extending in write.
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