MusikAnimal is right, however, Wikidata and Commons either have a sui
generis slice, or they share it with a few very large wikis. Tools that do
any kind of crosswiki analysis would instantly break, as most of them
utilise joining by Wikidata items at the very least.
I second Maarten here. This would mean a lot of things that currently
require a (relatively simple) SQL query would need a full script, which
would do the join at the application level.
I fully understand the reasoning, but there needs to be some replacement.
Intentionally introduce breaking changes while providing no "new standard"
is a bad pattern in a community environment.
Martin
On Wed, Nov 11, 2020, 10:31 PM MusikAnimal <musikanimal(a)gmail.com> wrote:
Technically, cross-wiki joins aren't completely
disallowed, you just have
to make sure each of the db names are on the same slice/section, right?
~ MA
On Wed, Nov 11, 2020 at 4:11 PM Maarten Dammers <maarten(a)mdammers.nl>
wrote:
Hi Joaquin,
On 10-11-2020 21:26, Joaquin Oltra Hernandez wrote:
TLDR: Wiki Replicas' architecture is being redesigned for stability and
performance. Cross database JOINs will not be available and a host
connection will only allow querying its associated DB. See [1]
<https://wikitech.wikimedia.org/wiki/News/Wiki_Replicas_2020_Redesign>
for more details.
If you only think of Wikipedia, not a lot will break probably, but if you
take into account Commons and Wikidata a lot will break. A quick grep in my
folder with Commons queries returns 123 lines with cross database joins. So
yes, stuff will break and tools will be abandoned. This follows the
practice that seems to have become standard for the WMF these days:
Decisions are made with a small group within the WMF without any community
involved. Only after the decision has been made, it's announced.
Unhappy and disappointed,
Maarten
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