Nice... I built something same last year (not active anymore): https://www.producthunt.com/products/zenquery https://www.producthunt.com/products/zenquery It w

Nice... I built something same last year (not active anymore): https://www.producthunt.com/products/zenquery https://www.producthunt.com/products/zenquery It was able to query csv, json, parquet and xlsx files, all locally. You could also mix files of different types in single session, and, manage multiple sets of files as individual sessions that you can switch easily whenever needed.