html_url,issue_url,id,node_id,user,created_at,updated_at,author_association,body,reactions,issue,performed_via_github_app
https://github.com/simonw/sqlite-utils/issues/139#issuecomment-682815377,https://api.github.com/repos/simonw/sqlite-utils/issues/139,682815377,MDEyOklzc3VlQ29tbWVudDY4MjgxNTM3Nw==,96218,2020-08-28T16:14:58Z,2020-08-28T16:14:58Z,CONTRIBUTOR,"Thanks!  And yeah, I had updating the docs on my list too :)  Will try to get to it this afternoon (budgeting time is fraught with uncertainty at the moment!).","{""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",686978131,
https://github.com/simonw/sqlite-utils/issues/139#issuecomment-682182178,https://api.github.com/repos/simonw/sqlite-utils/issues/139,682182178,MDEyOklzc3VlQ29tbWVudDY4MjE4MjE3OA==,96218,2020-08-27T20:46:18Z,2020-08-27T20:46:18Z,CONTRIBUTOR,"> I tried changing the batch_size argument to the total number of records, but it seems only to effect the number of rows that are committed at a time, and has no influence on this problem.

So the reason for this is that the `batch_size` for import is limited (of necessity) here: https://github.com/simonw/sqlite-utils/blob/main/sqlite_utils/db.py#L1048

With regard to the issue of ignoring columns, however, I made a fork and hacked a temporary fix that looks like this:
https://github.com/simonwiles/sqlite-utils/commit/3901f43c6a712a1a3efc340b5b8d8fd0cbe8ee63

It doesn't seem to affect performance enormously (but I've not tested it thoroughly), and it now does what I need (and would expect, tbh), but it now fails the test here:
https://github.com/simonw/sqlite-utils/blob/main/tests/test_create.py#L710-L716

The existence of this test suggests that `insert_all()` is behaving as intended, of course.  It seems odd to me that this would be a desirable default behaviour (let alone the only behaviour), and its not very prominently flagged-up, either.

@simonw is this something you'd be willing to look at a PR for?  I assume you wouldn't want to change the default behaviour at this point, but perhaps an option could be provided, or at least a bit more of a warning in the docs.  Are there oversights in the implementation that I've made?

Would be grateful for your thoughts!  Thanks!
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