[GitHub] [arrow] wesm opened a new pull request #7535: [Format][DONOTMERGE] Columnar.rst changes for removing validity bitmap from union types

[GitBox]

wesm opened a new pull request #7535:
URL: https://github.com/apache/arrow/pull/7535


   See mailing list discussion. 


----------------------------------------------------------------
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