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[draft] changelog for 20.3.6

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## ClickHouse release v20.3
### ClickHouse release origin/20.3 FIXME as compared to v20.3.5.21-stable
#### Bug Fix
* Convert types if the table definition of a View does not correspond to the SELECT query. This fixes [#10180](https://github.com/ClickHouse/ClickHouse/issues/10180) and [#10022](https://github.com/ClickHouse/ClickHouse/issues/10022). [#10217](https://github.com/ClickHouse/ClickHouse/pull/10217) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix `parseDateTimeBestEffort` for strings in RFC-2822 when day of week is Tuesday or Thursday. This fixes [#10082](https://github.com/ClickHouse/ClickHouse/issues/10082). [#10214](https://github.com/ClickHouse/ClickHouse/pull/10214) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix column names of constants inside JOIN that may clash with names of constants outside of JOIN. [#10207](https://github.com/ClickHouse/ClickHouse/pull/10207) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Fix possible inifinite query execution when the query actually should stop on LIMIT, while reading from infinite source like `system.numbers` or `system.zeros`. [#10206](https://github.com/ClickHouse/ClickHouse/pull/10206) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix using the current database for access checking when the database isn't specified. [#10192](https://github.com/ClickHouse/ClickHouse/pull/10192) ([Vitaly Baranov](https://github.com/vitlibar)).
* Convert blocks if structure does not match on INSERT into Distributed(). [#10135](https://github.com/ClickHouse/ClickHouse/pull/10135) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible incorrect result for extremes in processors pipeline. [#10131](https://github.com/ClickHouse/ClickHouse/pull/10131) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix some kinds of alters with compact parts. [#10130](https://github.com/ClickHouse/ClickHouse/pull/10130) ([Anton Popov](https://github.com/CurtizJ)).
* Fix incorrect `index_granularity_bytes` check while creating new replica. Fixes [#10098](https://github.com/ClickHouse/ClickHouse/issues/10098). [#10121](https://github.com/ClickHouse/ClickHouse/pull/10121) ([alesapin](https://github.com/alesapin)).
* Fix SIGSEGV on INSERT into Distributed table when its structure differs from the underlying tables. [#10105](https://github.com/ClickHouse/ClickHouse/pull/10105) ([Azat Khuzhin](https://github.com/azat)).
* Fix possible rows loss for queries with `JOIN` and `UNION ALL`. Fixes [#9826](https://github.com/ClickHouse/ClickHouse/issues/9826), [#10113](https://github.com/ClickHouse/ClickHouse/issues/10113). [#10099](https://github.com/ClickHouse/ClickHouse/pull/10099) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fixed replicated tables startup when updating from an old ClickHouse version where `/table/replicas/replica_name/metadata` node doesn't exist. Fixes [#10037](https://github.com/ClickHouse/ClickHouse/issues/10037). [#10095](https://github.com/ClickHouse/ClickHouse/pull/10095) ([alesapin](https://github.com/alesapin)).
* Add some arguments check and support identifier arguments for MySQL Database Engine. [#10077](https://github.com/ClickHouse/ClickHouse/pull/10077) ([Winter Zhang](https://github.com/zhang2014)).
* Fix bug in clickhouse dictionary source from localhost clickhouse server. The bug may lead to memory corruption if types in dictionary and source are not compatible. [#10071](https://github.com/ClickHouse/ClickHouse/pull/10071) ([alesapin](https://github.com/alesapin)).
* Fix bug in `CHECK TABLE` query when table contain skip indices. [#10068](https://github.com/ClickHouse/ClickHouse/pull/10068) ([alesapin](https://github.com/alesapin)).
* Fix error `Cannot clone block with columns because block has 0 columns ... While executing GroupingAggregatedTransform`. It happened when setting `distributed_aggregation_memory_efficient` was enabled, and distributed query read aggregating data with different level from different shards (mixed single and two level aggregation). [#10063](https://github.com/ClickHouse/ClickHouse/pull/10063) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix a segmentation fault that could occur in GROUP BY over string keys containing trailing zero bytes ([#8636](https://github.com/ClickHouse/ClickHouse/issues/8636), [#8925](https://github.com/ClickHouse/ClickHouse/issues/8925)). [#10025](https://github.com/ClickHouse/ClickHouse/pull/10025) ([Alexander Kuzmenkov](https://github.com/akuzm)).
* Fix parallel distributed INSERT SELECT for remote table. This PR fixes the solution provided in [#9759](https://github.com/ClickHouse/ClickHouse/pull/9759). [#9999](https://github.com/ClickHouse/ClickHouse/pull/9999) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix the number of threads used for remote query execution (performance regression, since 20.3). This happened when query from `Distributed` table was executed simultaneously on local and remote shards. Fixes [#9965](https://github.com/ClickHouse/ClickHouse/issues/9965). [#9971](https://github.com/ClickHouse/ClickHouse/pull/9971) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Fix bug in which the necessary tables weren't retrieved at one of the processing stages of queries to some databases. Fixes [#9699](https://github.com/ClickHouse/ClickHouse/issues/9699). [#9949](https://github.com/ClickHouse/ClickHouse/pull/9949) ([achulkov2](https://github.com/achulkov2)).
* Fix 'Not found column in block' error when `JOIN` appears with `TOTALS`. Fixes [#9839](https://github.com/ClickHouse/ClickHouse/issues/9839). [#9939](https://github.com/ClickHouse/ClickHouse/pull/9939) ([Artem Zuikov](https://github.com/4ertus2)).
* Fix a race between DDLWorker and DDLWorkerClnr during startup that can cause the DDLWorker to exit and all future DDL queries to hang. [#9927](https://github.com/ClickHouse/ClickHouse/pull/9927) ([Gagan Arneja](https://github.com/garneja)).
* Fix parsing multiple hosts set in the CREATE USER command, e.g. `CREATE USER user6 HOST NAME REGEXP 'lo.?*host', NAME REGEXP 'lo*host'`. [#9924](https://github.com/ClickHouse/ClickHouse/pull/9924) ([Vitaly Baranov](https://github.com/vitlibar)).
* Fix `TRUNCATE` for Join table engine ([#9917](https://github.com/ClickHouse/ClickHouse/issues/9917)). [#9920](https://github.com/ClickHouse/ClickHouse/pull/9920) ([Amos Bird](https://github.com/amosbird)).
* Fix "scalar doesn't exist" error in ALTERs ([#9878](https://github.com/ClickHouse/ClickHouse/issues/9878)). [#9904](https://github.com/ClickHouse/ClickHouse/pull/9904) ([Amos Bird](https://github.com/amosbird)).
* Fix race condition between drop and optimize in `ReplicatedMergeTree`. [#9901](https://github.com/ClickHouse/ClickHouse/pull/9901) ([alesapin](https://github.com/alesapin)).
* Fix error with qualified names in `distributed_product_mode='local'`. Fixes [#4756](https://github.com/ClickHouse/ClickHouse/issues/4756). [#9891](https://github.com/ClickHouse/ClickHouse/pull/9891) ([Artem Zuikov](https://github.com/4ertus2)).
* Fix calculating grants for introspection functions from the setting 'allow_introspection_functions'. [#9840](https://github.com/ClickHouse/ClickHouse/pull/9840) ([Vitaly Baranov](https://github.com/vitlibar)).
#### Build/Testing/Packaging Improvement
* Fix integration test `test_settings_constraints`. [#9962](https://github.com/ClickHouse/ClickHouse/pull/9962) ([Vitaly Baranov](https://github.com/vitlibar)).
* Removed dependency on `clock_getres`. [#9833](https://github.com/ClickHouse/ClickHouse/pull/9833) ([alexey-milovidov](https://github.com/alexey-milovidov)).
### ClickHouse release v20.3.5.21, 2020-03-27
#### Bug Fix