Our SQL is very similar to ClickHouse SQL, in that we used ClickHouse SQL as a starting point as that's what our underlying DB is. We needed to have our own parser so that we could add additional language features on top.

I think you should clarify that (or whether) while you didn't look at the generated code, you are actually going to adjust it in the future.

How did the two approaches compare in terms of code readability?