RussellSpitzer commented on pull request #2496:
URL: https://github.com/apache/iceberg/pull/2496#issuecomment-1036533814
I think the default issue could be issued by scanning through the schemas
created since the file was created and only using the first available default.
This seems kind of expensive to me though. General algorithm is
```
For missing column A in file written at Snapshot X
Find the first Schema created after X which applies a default value to A
If such a schema exists
return the schema's default
else
return null
```
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