Alias metadata may be lost when the physical expression is created #27156

#[test]
fn non_literal_alias_metadata_differs_between_logical_and_physical() -> Result<()> {
    let schema = Schema::new(vec![Field::new("value", DataType::Int64, false)]);
    let df_schema = DFSchema::try_from(schema.clone())?;

    let metadata = FieldMetadata::from(HashMap::from([(
        "source".to_string(),
        "alias".to_string(),
    )]));

    let expr = col("value").alias_with_metadata("aliased_value", Some(metadata));

    let logical_field = expr.to_field(&df_schema)?.1;
    let physical_expr = create_physical_expr(
        &expr,
        &df_schema,
        &ExecutionProps::new(),
        &PhysicalPlanningContext::default(),
    )?;
    let physical_field = physical_expr.return_field(&schema)?;

    // Logical Alias applies its supplied metadata.
    assert_eq!(
        logical_field.metadata().get("source").map(String::as_str),
        Some("alias")
    );

    // Physical lowering removes a non-literal Alias and its metadata.
    assert_eq!(physical_field.metadata().get("source"), None);

    Ok(())
}