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Very cool. Major props for putting this out there and accepting arbitrary queries.

Couple comments / questions:

- Correct that there’s no GROUP BY support?

- EXPLAIN or similar would be nice, both to get a peek at how your engine works & to anticipate whether a query is using parallel / SIMD execution and will take milliseconds vs. minutes.

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Thank you! there is no 'GROUP BY' keyword support. Optimiser works out group by queries without it. We are planning to put a noop there, just to be nice to finger memoory.

EXPLAIN would be quite boring in our case, we use a myriad of methods to make query fast. We would love to keep up the performance so that no one ever needed to be interested in query plan.

Check the example queries, one of them had aggregation and simple column selection in the same query with an "order by" clause at the end.

I can't tell from the output whether there is an implicit "group by" going on over the non-aggregated columns, but eg. this query produced some results without any errors:

select windDir, avg(windSpeed) from weather

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