dtenedor opened a new pull request, #36623:
URL: https://github.com/apache/spark/pull/36623

   ### What changes were proposed in this pull request?
   
   Support Avro scans when the table schema has associated DEFAULT column 
values.
   
   Example:
   
   ```
   create table t(i int) using avro;
   insert into t values(42);
   alter table t add column s string default concat('abc', def');
   select * from t;
   > 42, 'abcdef'
   ```
   
   ### Why are the changes needed?
   
   This change makes it easier to build, query, and maintain tables backed by 
Avro data.
   
   ### Does this PR introduce _any_ user-facing change?
   
   Yes.
   
   ### How was this patch tested?
   
   This PR includes new test coverage.


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