Stress test binary to text converter using fuzzed plans

[EpsilonPrime]

The plan specification allows for a myriad of combinations that are difficult to test exhaustively. Fuzzing could illuminate unexpected combinations such as those caused by unexpected return types encountered by the visitors.

[westonpace]

I think a Substrait fuzzer would be very valuable beyond just stress testing the converter. I suppose the converter wouldn't care if the plans were practical though.