MySQL uses an extremely bad plan for the update with subquery here.
For the time being let's split out the subquery.
This'll break if the user has too many revision rows, but on the other
hand all the existing queries here will probably break in the same way
so let's leave that for later.
Bug: T210628
Change-Id: Ia3eb41b43b96c506349279e19743c41530969636
When this was originally written, the plan was to read both the old and
new fields during the transition period, while stopping writes to them
midway through. It turns out that the WHERE conditions to do read-both
correctly are generally not handled well by the database and working
around that would require a lot of complicated code (see what's being
removed from ApiQueryUserContribs here, for example).
We can simplify things greatly by instead having it write both fields
during the transition period, reading from the old for the first part
and the new for the second part, as is being done for MCR.
Bug: T204669
Change-Id: I4764c1c7883dc1003cb12729455c8107319f70b1
Depends-On: I845f6ae462f2539ebd35cbb5f2ca8b5714e2c1fb
Depends-On: I88b31b977543fdbdf69f8c1158e77e448df94e11
Storing the user name or IP in every row in large tables like revision
and logging takes up space and makes operations on these tables slower.
This patch begins the process of moving those into one "actor" table
which other tables can reference with a single integer field.
A subsequent patch will remove the old columns.
Bug: T167246
Depends-On: I9293fd6e0f958d87e52965de925046f1bb8f8a50
Change-Id: I8d825eb02c69cc66d90bd41325133fd3f99f0226
The bit handling in RevisionDeleteUser::setUsernameBitfields was not
using Database::bitAnd, bitOr or bitNot.
Also changed one condition to use Database::addQuotes
Change-Id: I898ab5afcb628bb7ebe81bae1522153434c7fe98
Swapped some "$var type" to "type $var" or added missing types
before the $var. Changed some other types to match the more common
spelling. Makes beginning of some text in captial.
Also added some missing @param.
Change-Id: Iced714bca004756b461b66067a49a925a7e3b877
