| daniel added a comment. |
I don't think because fields have been added but not yet removed, but I cannot promise that won't happen soon (it is not in my hand, it is the mw core maintainers who handle that) or it is happening now (we should test on deploy on a smaller db first).
No fields are going to be removed in the foreseeable future (T198557). Some, like rev_text_id and rev_content_model, will no longer be written some, probably some time later this year (T198312). All new fields and tables have been populated and are being kept up to date, so tools can start to use the new schema immediately (I'll update the description to reflect that). The live cluster will start doing that as well in the next couple of weeks, see T198308: Enable MCR migration stage "write both, read new" on live systems.
In my mind, legacy joins are not needed if this is announced as a breaking change. The vast majority of tools probably doesn't care about rev_content_model.
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