* Create replicated_fetches.md
Задокументировал системную таблицу system.replicated_fetches.
* Edit and translate replicated_fetches.md
Поправил английскую версию и перевел на русский язык.
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Внес поправки.
* Update replicated_fetches.md
Внес изменения в русскую версию.
Co-authored-by: Dmitriy <sevirov@yandex-team.ru>
This is just confusing, I'd expect it to be an identity. It looks
especially weird when you do something like `toString(Field("don't escape
me"))`. Let's see which tests are going to fail.
For now uuids are not generated at all, they are present only if the
part is updated manually (as you can see in the integration test).
The only place where they can be seen today by an end user is in
`system.parts` table. I was looking for hiding this column behind an
option but couldn't find an easy way to do that.
Likely this is also required for WAL, but need to think how not to break
compatibility.
Relates to #13574, https://github.com/ClickHouse/ClickHouse/issues/13574
Next 1: In the upcoming PR the plan is to integrate de-duplication based on
these fingerprints in the query pipeline.
Next 2: We'll enable automatic generation of uuids and come up with a
way for conditionally sending uuids when processing distributed queries
only when part movement is in progress.
Sometimes it is odd to get TLD itself from the
cutToFirstSignificantSubdomain() (since you will not get TLD itself if
you pass it directly):
- cutToFirstSignificantSubdomain('org') -> ""
- cutToFirstSignificantSubdomain('www.org') -> org
- cutToFirstSignificantSubdomain('kernel.org') -> kernel.org
- cutToFirstSignificantSubdomain('www.kernel.org') -> kernel.org
So add one more function to get www.org in this case:
- cutToFirstSignificantSubdomainWithWWW('org') -> ""
- cutToFirstSignificantSubdomainWithWWW('www.org') -> www.org
- cutToFirstSignificantSubdomainWithWWW('kernel.org') -> kernel.org
- cutToFirstSignificantSubdomainWithWWW('www.kernel.org') -> kernel.org
P.S. not sure about the naming though, so it will great if someone has
suggestion for the name.
