[doctorzook]

Unless your data is really unusual, I’d generally recommend that you avoid writing your own query language and processor: it’s just damn hard to make it work well. Instead, look at how to put something like DuckDB in front of your data so people can just write SQL.

[PaulHoule]

Or a step up from that: build a compiler that converts queries in a human-friendly or application-specific language to SQL or something similar.