martin-g commented on code in PR #19345:
URL: https://github.com/apache/datafusion/pull/19345#discussion_r2622653047


##########
datafusion-examples/examples/custom_data_source/default_column_values.rs:
##########


Review Comment:
   Should this line be removed/edited ?
   
https://github.com/apache/datafusion/pull/19345/changes#diff-dd8ef704e14ac0794362f6dd9b356468e45d3ea33be15708ec2f339b5a0fdb72R67
 says that projection expressions (note: expressions vs. columns) is also 
covered by PhysicalExprAdapter



##########
docs/source/library-user-guide/upgrading.md:
##########
@@ -490,6 +490,24 @@ If you were using a custom `SchemaAdapterFactory` for 
schema adaptation (e.g., d
 
 See the [default column values 
example](https://github.com/apache/datafusion/blob/main/datafusion-examples/examples/custom_data_source/default_column_values.rs)
 for how to implement a custom `PhysicalExprAdapterFactory`.
 
+### `SchemaAdapter` and `SchemaAdapterFactory` completely removed

Review Comment:
   This new paragraph overlaps with the previous one - `### 
`SchemaAdapterFactory` Fully Removed from Parquet`
   Maybe they should be merged into one ?!



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