Commit Graph

22 Commits

Author SHA1 Message Date
Kevin Michel
008c3c812b
Allow non-replicated ALTER TABLE FETCH/ATTACH in Replicated databases
`ALTER TABLE ... FETCH` and `ALTER TABLE ... ATTACH` queries were
disabled in the Replicated database engine, because it could cause
accidental duplication of data.

This enables these queries but without replicating them.

In the case of `FETCH`, the part will only be fetched on the server
where the query is issued.

Similarly, in the case of `ATTACH`, the attached part only needs to
be available on the server where the query is issued.

If the table itself is using one of the Replicated MergeTree engines,
the attached data is then replicated by the table engine itself,
without intervention of the database engine.

This change is meant to help with live backup/restore when using the
Replicated database engine, using FREEZE for backup and ATTACH for
restore.
2021-09-21 17:45:23 +02:00
Vladimir Chebotarev
de5daa22ab Revert "MATERIALIZE COLUMN xxx FINAL"
This reverts commit bf1430c1ec.
2021-08-30 11:50:26 +03:00
Vladimir Chebotarev
0d6e0181d6 MATERIALIZE COLUMN xxx FINAL 2021-08-30 11:49:59 +03:00
Vladimir Chebotarev
ce0850007f 1. Draw some circles. 2021-08-30 11:49:26 +03:00
Amos Bird
b80065ab59
Try our best to log query_kind 2021-08-04 22:09:23 +08:00
Aleksei Semiglazov
9a5365fc41
CLICKHOUSE-784: reset merge tree setting
Add an ability to reset custom setting to default and remove it from table's metadata.
This will allow to rollback the change without knowing the system/config's default.

Signed-off-by: Aleksei Semiglazov <asemiglazov@cloudflare.com>
2021-07-01 20:09:54 +01:00
Amos Bird
264cff6415
Projections
TODO (suggested by Nikolai)

1. Build query plan fro current query (inside storage::read) up to WithMergableState
2. Check, that plan is simple enough: Aggregating - Expression - Filter - ReadFromStorage (or simplier)
3. Check, that filter is the same as filter in projection, and also expression calculates the same aggregation keys as in projection
4. Return WithMergableState if projection applies

3 will be easier to do with ActionsDAG, cause it sees all functions, and dependencies are direct (but it is possible with ExpressionActions also)

Also need to figure out how prewhere works for projections, and
row_filter_policies.

wip
2021-05-11 18:12:23 +08:00
Pavel Kovalenko
a3c0c35dff ALTER TABLE UNFREEZE rework. 2021-03-02 23:28:42 +03:00
Pavel Kovalenko
078dfce038 Add ALTER TABLE UNFREEZE command. 2021-02-24 17:28:30 +03:00
Alexander Tokmakov
f20d5e3b41 fix 2021-01-26 20:51:25 +03:00
Amos Bird
a32f6dcf1b
Apply alter settings on cluster to all replicas 2021-01-06 20:08:46 +08:00
Ivan
315ff4f0d9
ANTLR4 Grammar for ClickHouse and new parser (#11298) 2020-12-04 05:15:44 +03:00
Vladimir Chebotarev
059357d51e
ALTER UPDATE/DELETE ... IN PARTITION with partition pruning in ReplicatedMergeTree (#13403)
Co-authored-by: Alexander Kazakov <Akazz@users.noreply.github.com>
2020-11-10 13:23:46 +03:00
alesapin
5ffee8808a
Alter remove column properties and TTLs (#14742) 2020-09-20 16:27:33 +03:00
alesapin
2c4047b280 Revert accident changes 2020-09-11 20:07:00 +03:00
alesapin
a5f8899874 First implementation 2020-09-11 20:04:55 +03:00
alesapin
489b9c80ac Starting steps 2020-09-11 20:04:55 +03:00
Amos Bird
078b14610d
ALTER MODIFY SAMPLE BY 2020-08-27 22:31:30 +08:00
zhang2014
9ed5c6d925 ISSUES-4006 support first for ALTER ADD|MODIFY COLUMN 2020-07-01 22:58:52 +08:00
alesapin
f026fa7de1 Rename PartDestinationType to DataDestionationType, because there is no part-specific information 2020-05-22 16:29:33 +03:00
alesapin
1cb072d58a Merge branch 'master' into alter_rename_column 2020-04-06 11:40:27 +03:00
Ivan Lezhankin
06446b4f08 dbms/ → src/ 2020-04-03 18:14:31 +03:00