[GitHub] spark issue #9940: [SPARK-11955][SQL] Mark optional fields in merging schema...

[rxin <gi...@git.apache.org>]

Github user rxin commented on the issue:

    https://github.com/apache/spark/pull/9940
  
    Hey guys -- this patch is severely under documented. It also isn't great to introduce something in the metadata to tag a column as optional. 


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