[I] Output schema of the CopyTo logical plan is not correct. [datafusion]

[via GitHub]

bert-beyondloops opened a new issue, #16704:
URL: https://github.com/apache/datafusion/issues/16704

   ### Describe the bug
   
   
   The output schema of the CopyTo logical plan currently directly outputs the 
underlying schema of it's child.
   The physical plan however always returns a 1 row/column count which 
represents the number of affected rows.
   
   This is inconsistent.
   
   
   
   ### To Reproduce
   
   Following test fails : 
   
   
   ```
   #[tokio::test]
   async fn test_copy_schema() -> Result<()> {
       let tmp_dir = TempDir::new()?;
   
       let session_state = 
SessionStateBuilder::new_with_default_features().build();
   
       let session_ctx = SessionContext::new_with_state(session_state);
   
       let schema = Arc::new(Schema::new(vec![Field::new("a", DataType::Int64, 
true)]));
   
       // Create and register the source table with the provided schema and data
       let source_table = Arc::new(MemTable::try_new(schema.clone(), 
vec![vec![]])?);
       session_ctx.register_table("source_table", source_table.clone())?;
   
       let target_path = tmp_dir.path().join("target.csv");
   
       let query = format!(
           "COPY source_table TO '{:?}' STORED AS csv",
           target_path.to_str().unwrap()
       );
   
       let result = session_ctx.sql(&query).await?;
       assert_logical_expr_schema_eq_physical_expr_schema(result).await?;
       Ok(())
   }
   ```
   
   The schema of the physical output is not the same as the logical plan.
   
   ### Expected behavior
   
   
   The CopyTo logical plan returns the same schema as the physical plan, being 
a 1 column named "count"
   
   ### Additional context
   
   _No response_


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