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id node_id number title user state locked assignee milestone comments created_at updated_at ▲ closed_at author_association pull_request body repo type active_lock_reason performed_via_github_app reactions draft state_reason
548591089 MDU6SXNzdWU1NDg1OTEwODk= 657 Allow creation of virtual tables at startup dazzag24 1055831 open 0     4 2020-01-12T16:10:55Z 2021-01-15T20:24:35Z   NONE  

Hi,

I've been experimenting with SQLite reading from huge datasets using this excellent Parquet extension from @cldellow. https://cldellow.com/2018/06/22/sqlite-parquet-vtable.html https://github.com/cldellow/sqlite-parquet-vtable

This works really well, but I was keen to see if I could combine datasette with this. Having previously experimented with the spatialite extension I knew that datasette supports loading extensions in the underlying sqlite instance. However I hit a blocker as the current design only allows SELECT statements to be executed and so I am unable to execute the crucial

CREATE VIRTUAL TABLE .........

command that is required to load the data from the parquet file into the table.

It seems like this would be a simple-ish change, but I don't know enough about the architecture of datasette to start implementing this myself? Could this be done as a datasette plugin? or would this require more fundamental changes at initialisation time?

My thoughts are that something at init time could detect that the user was loading a .parquet file and then switch to a mode were it loads that via the "CREATE VIRTUAL TABLE..." rather than loading the .db file in the default case??

I'm happy to contribute code and testing, I just need some pointers on the best approach.

Thanks Darren

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