I've pushed a commit to GitHub that allows MySQL and PostgreSQL to combine multiple table operations into a single query (https://github.com/jeremyevans/sequel/commit/084b0740691b4e902868a885af7313b6983232cb). This can result significant performance increases for large tables (~N times speedup where N is the number of operations combined). This commit is risky compared to most other commits, and I would appreciate additional testing. If anyone could run all of their old migrations on a test database using the master branch and let me know whether anything breaks, that would be great, particularly if the migrations contain alter_table blocks with multiple operations.
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