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"so encouraging folks to conserve them by charging for bytes scanned seem like a good measure."

I wonder if it warns you about potentially expensive button clicks. A little cartesian join, and...ouch.

It’s not powerful enough to do a Cartesian join (yet?). Most you can do is scan once over a big dataset.

Hmm. I wonder if an "index only" query charges for the scan of the index, or a full table scan.

AFAICT, there is no indexing. It appears to just scan the logs as necessary. Maybe indexing will come later.

Bigquery has a cool function like this where it will tell you the cost of the query before you run it.