Fails to read file(s)

[liborty]

When calling head or cat on a single largish file, pqrs v0.2.2 (and previous versions) attempts to open lots of files? Why?
I only want to read one line at a time and translate .parquet to .csv.:

$ pqrs cat --csv live_int8.parquet > live.csv

#######################
File: live_int8.parquet
#######################

thread 'main' panicked at 'called `Result::unwrap()` on an `Err` value: Os { code: 24, kind: Uncategorized, message: "Too many open files" }', /home/runner/.cargo/registry/src/github.com-1ecc6299db9ec823/parquet-12.0.0/src/util/io.rs:82:50
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace