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Issue description

BatchedParquetReader takes in the projection argument but does not consider the columns set by user using ParquetReader.with_columns. Might be a good idea to get projection from columns as done here.

If this is a bug rather than a design decision, I am happy to open a PR for this as I would like to start contributing to polars and this seems like a good entry point!

Reproducible example

Works as expected (first column selected) -

let pq_reader = ParquetReader::new(input_file)
        .with_projection(Some(vec![0]))
        .batched(chunk_size)
        .unwrap();

Selects all columns -

let pq_reader = ParquetReader::new(input_file)
        .with_columns(Some(vec![String::from("col1")]))
        .batched(chunk_size)
        .unwrap();

Expected behavior

BatchedParquetReader should filter columns specified using "with_columns"

Installed versions

v0.27.2 and v0.28.0