Github user maropu commented on the issue: https://github.com/apache/spark/pull/19021 Also, I talked with @viirya [here](https://github.com/apache/spark/pull/18931#issuecomment-323697425) and `-1` seems to be more natural to disable this too-long-function option. If we don't strongly disagree with this, I could make [another trivial pr](https://github.com/apache/spark/compare/master...maropu:SPARK-21603-FOLLOWUP-2) to fix, too. @gatorsmile
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