HyukjinKwon opened a new pull request #29041: URL: https://github.com/apache/spark/pull/29041
### What changes were proposed in this pull request? This PR proposes to partially reverts the simple string in `NullType` at https://github.com/apache/spark/pull/28833: `NullType.simpleString` back from `unknown` to `null`. ### Why are the changes needed? - Technically speaking, it's orthogonal with the issue itself, SPARK-20680. - It needs some more discussion, see https://github.com/apache/spark/pull/28833#issuecomment-655277714 ### Does this PR introduce _any_ user-facing change? It reverts back the user-facing changes at https://github.com/apache/spark/pull/28833. The simple string of `NullType` is back to `null`. ### How was this patch tested? I just logically reverted. Jenkins should test it out. ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: reviews-unsubscr...@spark.apache.org For additional commands, e-mail: reviews-h...@spark.apache.org
