* Fix unit test `collapsing_sorted_stream`. [#9367](https://github.com/ClickHouse/ClickHouse/pull/9367)([Deleted user](https://github.com/ghost)).
### ClickHouse release v20.1.9.54, 2020-03-28
#### Bug Fix
* Fix `'Different expressions with the same alias'` error when query has `PREWHERE` and `WHERE` on distributed table and `SET distributed_product_mode = 'local'`. [#9871](https://github.com/ClickHouse/ClickHouse/pull/9871)([Artem Zuikov](https://github.com/4ertus2)).
* Fix mutations excessive memory consumption for tables with a composite primary key. This fixes [#9850](https://github.com/ClickHouse/ClickHouse/issues/9850). [#9860](https://github.com/ClickHouse/ClickHouse/pull/9860)([alesapin](https://github.com/alesapin)).
* For INSERT queries shard now clamps the settings got from the initiator to the shard's constaints instead of throwing an exception. This fix allows to send `INSERT` queries to a shard with another constraints. This change improves fix [#9447](https://github.com/ClickHouse/ClickHouse/issues/9447). [#9852](https://github.com/ClickHouse/ClickHouse/pull/9852)([Vitaly Baranov](https://github.com/vitlibar)).
* Fix possible exception `Got 0 in totals chunk, expected 1` on client. It happened for queries with `JOIN` in case if right joined table had zero rows. Example: `select * from system.one t1 join system.one t2 on t1.dummy = t2.dummy limit 0 FORMAT TabSeparated;`. Fixes [#9777](https://github.com/ClickHouse/ClickHouse/issues/9777). [#9823](https://github.com/ClickHouse/ClickHouse/pull/9823)([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix `SIGSEGV` with `optimize_skip_unused_shards` when type cannot be converted. [#9804](https://github.com/ClickHouse/ClickHouse/pull/9804)([Azat Khuzhin](https://github.com/azat)).
* Fixed a few cases when timezone of the function argument wasn't used properly. [#9574](https://github.com/ClickHouse/ClickHouse/pull/9574)([Vasily Nemkov](https://github.com/Enmk)).
#### Improvement
* Remove `ORDER BY` stage from mutations because we read from a single ordered part in a single thread. Also add check that the order of rows in mutation is ordered in sorting key order and this order is not violated. [#9886](https://github.com/ClickHouse/ClickHouse/pull/9886)([alesapin](https://github.com/alesapin)).
#### Build/Testing/Packaging Improvement
* Clean up duplicated linker flags. Make sure the linker won't look up an unexpected symbol. [#9433](https://github.com/ClickHouse/ClickHouse/pull/9433)([Amos Bird](https://github.com/amosbird)).
