As we know, FileScanTask has two fields project_field_ids and schema. I think the RecordBatch from the reader of this FileScanTask should always follow the schema specified in FileScanTask. However, in some case the schema could be inconsistent.

Considering we have an iceberg table with schema (c1 int, c2 int, c3 int). If we select the table with this order c3, c2, c1. The RecordBatch schema still is c1, c2, c3 which confuses me a lot.

pub struct FileScanTask {
    data_file_path: String,
    project_field_ids: Vec<i32>,
    schema: SchemaRef,
    ...
}