[GitHub] [iceberg] rdblue commented on pull request #1177: Add schema upsert API for adding new fields and updating type (where applicable) using an input schema

[GitBox <gi...@apache.org>]

rdblue commented on pull request #1177:
URL: https://github.com/apache/iceberg/pull/1177#issuecomment-667414780


   @fbocse, the case I was thinking about was whether we want to handle promotion from required to optional if the observed schema doesn't contain a field, or if its field is optional.


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