This introduces a
join_types field for equeries, which helps
instrument join types (such as INNER vs. OUTER JOINs). That can be
useful in ensuring that queries are joining in a way that the developers
expect, which can have an impact on results.
This is off by default, for compatibility. If a mismatch would have been
reported, then a warning will be issued advising the developer to opt in
and that it will be made the default in a future version.
There's also a fix for formatting
sets, ensuring they're both sorted