add zookeeper name in system.replicas

[cangyin]

this would be useful for queries like:

SELECT
    zookeeper_name,
    count()
FROM system.replicas
INNER JOIN system.parts USING (database, table)
WHERE database = 'business'
GROUP BY zookeeper_name
ORDER BY count() ASC

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Add a new column zookeeper_name in system.replicas, to indicate on which (auxiliary) zookeeper cluster the replicated table's metadata is stored.

[alexey-milovidov]

Ok. Need to add a test, see tests/queries/0_stateless.

[alexey-milovidov]

Need to add a test.

[cangyin]

sorry for being late, i 'm busy at work recently.

[alexey-milovidov]

Ok. Now we need a changelog entry "a user-readable short description of the changes that goes to CHANGELOG.md"

[cangyin]

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

add zookeeper name in system.replicas

there is the Change entry.

[alexey-milovidov]

But it is difficult to understand - we need to write what, and why.

[cangyin]

see. (chrome spell check now becomes useful to me :)

[cangyin]

failing at CRLF again.

[cangyin]

some checks failed, seems irrelevant

[CheSema]

That requst is flaky
Fail in master, for example.
https://s3.amazonaws.com/clickhouse-test-reports/35827/248e8819ff2c5fb9b78f32f8f0199f77c9a841b0/stateless_tests__debug__[5_5].html

Order by needed.

[CheSema]

#49592