adriangb commented on issue #16800:
URL: https://github.com/apache/datafusion/issues/16800#issuecomment-3155626148

   @mbutrovich by "I don't see a way to handle default values that don't have a 
filter on them" I assume you're talking about projections e.g. `select 
column_that_may_be_missing_from_some_files from t`?
   
   The answer to that is that we are working on migrating that to use 
`PhysicalExprAdapter` but we're not there yet. Work is roughly tracked in 
https://github.com/apache/datafusion/issues/14993
   
   > Even the example says that default values without a filter on them should 
rely on the SchemaAdapter but we're seeing a ton of WARN messages that the API 
is going away.
   
   Terribly sorry about the warn messages. They were too aggressive / too soon. 
We've now removed it: https://github.com/apache/datafusion/pull/16968.
   
   Also wanted to mention we now have an example of how default values could be 
implemented with `PhysicalExprAdapter`: 
https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/default_column_values.rs


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