Commits on Jan 26, 2021

1. feat(spanner/spannertest): restructure column alteration implementation …

   Separate out validation from the alteration so that validation failures
   won't leave a corrupted table. This will also permit other schema
   changes to be more easily added in the future.
   
   Permit adding and removing NOT NULL for column types other than
   string/bytes, and enforce that it isn't permitted on primary key columns
   or array-typed columns.

   

   dsymonds committed Jan 26, 2021
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