The initial idea was to focus on cmd line tools... I added pandas for comparison, as it is one of the most used libs to work with datasets. I will either remove Pandas from the equation or add Polars. By the way, I run some benchmarks and polars seems a bit faster than spyql for the aggregation challenge, but does not scale (loads everything into memory)

Polars is for tabular data, a different kind of task.

But you can read json from polars (or from pandas first then polars) then you can do the map/reduce/filter like in the benchmark.