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* Now replicas that are processing the `ALTER TABLE ATTACH PART[ITION]` command search in their `detached/` folders before fetching the data from other replicas. As an implementation detail, a new command `ATTACH_PART` is introduced in the replicated log. Parts are searched and compared by their checksums. [#18978](https://github.com/ClickHouse/ClickHouse/pull/18978) ([Mike Kot](https://github.com/myrrc)). **Note**: * Now replicas that are processing the `ALTER TABLE ATTACH PART[ITION]` command search in their `detached/` folders before fetching the data from other replicas. As an implementation detail, a new command `ATTACH_PART` is introduced in the replicated log. Parts are searched and compared by their checksums. [#18978](https://github.com/ClickHouse/ClickHouse/pull/18978) ([Mike Kot](https://github.com/myrrc)). **Note**:
* `ATTACH PART[ITION]` queries may not work during cluster upgrade. * `ATTACH PART[ITION]` queries may not work during cluster upgrade.
* It's not possible to rollback to older ClickHouse version after executing `ALTER ... ATTACH` query in new version as the old servers would fail to pass the `ATTACH_PART` entry in the replicated log. * It's not possible to rollback to older ClickHouse version after executing `ALTER ... ATTACH` query in new version as the old servers would fail to pass the `ATTACH_PART` entry in the replicated log.
* In this version, empty `<remote_url_allow_hosts></remote_url_allow_hosts>` will block all access to remote hosts while in previous versions it did nothing. If you want to keep old behaviour and you have empty `remote_url_allow_hosts` element in configuration file, remove it. [#20058](https://github.com/ClickHouse/ClickHouse/pull/20058) ([Vladimir Chebotarev](https://github.com/excitoon)).
#### New Feature #### New Feature
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* Fix receive and send timeouts and non-blocking read in secure socket. [#21429](https://github.com/ClickHouse/ClickHouse/pull/21429) ([Kruglov Pavel](https://github.com/Avogar)). * Fix receive and send timeouts and non-blocking read in secure socket. [#21429](https://github.com/ClickHouse/ClickHouse/pull/21429) ([Kruglov Pavel](https://github.com/Avogar)).
* `force_drop_table` flag didn't work for `MATERIALIZED VIEW`, it's fixed. Fixes [#18943](https://github.com/ClickHouse/ClickHouse/issues/18943). [#20626](https://github.com/ClickHouse/ClickHouse/pull/20626) ([tavplubix](https://github.com/tavplubix)). * `force_drop_table` flag didn't work for `MATERIALIZED VIEW`, it's fixed. Fixes [#18943](https://github.com/ClickHouse/ClickHouse/issues/18943). [#20626](https://github.com/ClickHouse/ClickHouse/pull/20626) ([tavplubix](https://github.com/tavplubix)).
* Fix name clashes in `PredicateRewriteVisitor`. It caused incorrect `WHERE` filtration after full join. Close [#20497](https://github.com/ClickHouse/ClickHouse/issues/20497). [#20622](https://github.com/ClickHouse/ClickHouse/pull/20622) ([Vladimir](https://github.com/vdimir)). * Fix name clashes in `PredicateRewriteVisitor`. It caused incorrect `WHERE` filtration after full join. Close [#20497](https://github.com/ClickHouse/ClickHouse/issues/20497). [#20622](https://github.com/ClickHouse/ClickHouse/pull/20622) ([Vladimir](https://github.com/vdimir)).
* Fixed open behavior of remote host filter in case when there is `remote_url_allow_hosts` section in configuration but no entries there. [#20058](https://github.com/ClickHouse/ClickHouse/pull/20058) ([Vladimir Chebotarev](https://github.com/excitoon)).
#### Build/Testing/Packaging Improvement #### Build/Testing/Packaging Improvement