Changelog for 19.4.0 (early draft)

CHANGELOG.md

@@ -7,42 +7,16 @@
 * N-gram distance was added for fuzzy string comparison. It is similar to q-gram metrics in R language. [#4466](https://github.com/yandex/ClickHouse/pull/4466) ([Danila Kutenin](https://github.com/danlark1))
 * Combine rules for graphite rollup from dedicated aggregation and retention patterns. [#4426](https://github.com/yandex/ClickHouse/pull/4426) ([Mikhail f. Shiryaev](https://github.com/Felixoid))
 * Added `max_execution_speed` and `max_execution_speed_bytes` to limit resource usage. Added `min_execution_speed_bytes` setting to complement the `min_execution_speed`. [#4430](https://github.com/yandex/ClickHouse/pull/4430) ([Winter Zhang](https://github.com/zhang2014))
+* Implemented function `flatten` [#4555](https://github.com/yandex/ClickHouse/pull/4555) [#4409](https://github.com/yandex/ClickHouse/pull/4409) ([alexey-milovidov](https://github.com/alexey-milovidov) [kzon](https://github.com/kzon))
 * Added functions `arrayEnumerateDenseRanked` and `arrayEnumerateUniqRanked` (it's like `arrayEnumerateUniq` but allows to fine tune array depth to look for multidimensional arrays). [#4475](https://github.com/yandex/ClickHouse/pull/4475) ([proller](https://github.com/proller))
+* Multiple JOINS with some restrictions: no asterisks, no complex aliases in ON/WHERE/GROUP BY/... [#4462](https://github.com/yandex/ClickHouse/pull/4462) ([Artem Zuikov](https://github.com/4ertus2))
 
 ### [No category]
-*  [#4610](https://github.com/yandex/ClickHouse/pull/4610) ([Vasily Vasilkov](https://github.com/vgv))
-*  [#4612](https://github.com/yandex/ClickHouse/pull/4612) ([alexey-milovidov](https://github.com/alexey-milovidov))
-*  [#4613](https://github.com/yandex/ClickHouse/pull/4613) ([Max Akhmedov](https://github.com/zlobober))
-*  [#4614](https://github.com/yandex/ClickHouse/pull/4614) ([proller](https://github.com/proller))
-*  [#4622](https://github.com/yandex/ClickHouse/pull/4622) ([alexey-milovidov](https://github.com/alexey-milovidov))
-*  [#4624](https://github.com/yandex/ClickHouse/pull/4624) ([alexey-milovidov](https://github.com/alexey-milovidov))
-*  [#6](https://github.com/yandex/ClickHouse/pull/6) ([alesapin](https://github.com/alesapin))
-*  [#3759](https://github.com/yandex/ClickHouse/pull/3759) ([proller](https://github.com/proller))
-*  [#4371](https://github.com/yandex/ClickHouse/pull/4371) ([Vitaly Baranov](https://github.com/vitlibar))
-*  [#4387](https://github.com/yandex/ClickHouse/pull/4387) ([Ivan](https://github.com/abyss7))
-*  [#4407](https://github.com/yandex/ClickHouse/pull/4407) ([Nikita Vasilev](https://github.com/nikvas0))
-*  [#4410](https://github.com/yandex/ClickHouse/pull/4410) ([alesapin](https://github.com/alesapin))
-*  [#4440](https://github.com/yandex/ClickHouse/pull/4440) ([0xflotus](https://github.com/0xflotus))
-*  [#4441](https://github.com/yandex/ClickHouse/pull/4441) ([0xflotus](https://github.com/0xflotus))
-*  [#4444](https://github.com/yandex/ClickHouse/pull/4444) ([proller](https://github.com/proller))
-*  [#4447](https://github.com/yandex/ClickHouse/pull/4447) ([Alex Zatelepin](https://github.com/ztlpn))
-*  [#4458](https://github.com/yandex/ClickHouse/pull/4458) ([proller](https://github.com/proller))
-*  [#4460](https://github.com/yandex/ClickHouse/pull/4460) ([Alex Zatelepin](https://github.com/ztlpn))
-*  [#4464](https://github.com/yandex/ClickHouse/pull/4464) ([Alex Zatelepin](https://github.com/ztlpn))
-*  [#4468](https://github.com/yandex/ClickHouse/pull/4468) ([Anton Zhabolenko](https://github.com/ShantonRU))
-*  [#4471](https://github.com/yandex/ClickHouse/pull/4471) ([proller](https://github.com/proller))
-*  [#4479](https://github.com/yandex/ClickHouse/pull/4479) ([alesapin](https://github.com/alesapin))
-*  [#4482](https://github.com/yandex/ClickHouse/pull/4482) ([Michael Monashev](https://github.com/MichaelMonashev))
-*  [#4487](https://github.com/yandex/ClickHouse/pull/4487) ([Andrey Urusov](https://github.com/aurusov))
-* Cleanup distributed DDL queue in a separate thread so that it doesn't slow down the main loop that processes distributed DDL tasks. [#4502](https://github.com/yandex/ClickHouse/pull/4502) ([Alex Zatelepin](https://github.com/ztlpn))
-*  [#4503](https://github.com/yandex/ClickHouse/pull/4503) ([alesapin](https://github.com/alesapin))
-*  [#4516](https://github.com/yandex/ClickHouse/pull/4516) ([proller](https://github.com/proller))
-*  [#4519](https://github.com/yandex/ClickHouse/pull/4519) ([Ildar Musin](https://github.com/zilder))
-*  [#4521](https://github.com/yandex/ClickHouse/pull/4521) ([proller](https://github.com/proller))
-*  [#4531](https://github.com/yandex/ClickHouse/pull/4531) ([sdk2](https://github.com/sdk2))
-*  [#4536](https://github.com/yandex/ClickHouse/pull/4536) ([Amos Bird](https://github.com/amosbird))
-*  [#4539](https://github.com/yandex/ClickHouse/pull/4539) ([Leopold Schabel](https://github.com/leoluk))
-*  [#4555](https://github.com/yandex/ClickHouse/pull/4555) ([alexey-milovidov](https://github.com/alexey-milovidov))
+* Fixed undefined behaviour in ThreadPool [#4612](https://github.com/yandex/ClickHouse/pull/4612) ([alexey-milovidov](https://github.com/alexey-milovidov))
+* Fix compilation on Mac. [#4371](https://github.com/yandex/ClickHouse/pull/4371) ([Vitaly Baranov](https://github.com/vitlibar))
+* Improve push-down logic for joined statements. [#4387](https://github.com/yandex/ClickHouse/pull/4387) ([Ivan](https://github.com/abyss7))
+* Fixed bug in data skipping indices: order of granules after INSERT was incorrect. [#4407](https://github.com/yandex/ClickHouse/pull/4407) ([Nikita Vasilev](https://github.com/nikvas0))
+* Build fixes for FreeBSD. [#4444](https://github.com/yandex/ClickHouse/pull/4444) ([proller](https://github.com/proller))
 *  [#4568](https://github.com/yandex/ClickHouse/pull/4568) ([Vitaly Baranov](https://github.com/vitlibar))
 *  [#4574](https://github.com/yandex/ClickHouse/pull/4574) ([proller](https://github.com/proller))
 *  [#4582](https://github.com/yandex/ClickHouse/pull/4582) ([proller](https://github.com/proller))
@@ -82,16 +56,18 @@
 * Added queries from the benchmark on the website to automated performance tests. [#4496](https://github.com/yandex/ClickHouse/pull/4496) ([alexey-milovidov](https://github.com/alexey-milovidov))
 * Fixed a case when `quantileTiming` aggregate function can be called with negative or floating point argument (this fixes fuzz test with undefined behaviour sanitizer). [#4506](https://github.com/yandex/ClickHouse/pull/4506) ([alexey-milovidov](https://github.com/alexey-milovidov))
 * Added support for clang-9 [#4604](https://github.com/yandex/ClickHouse/pull/4604) ([alexey-milovidov](https://github.com/alexey-milovidov))
+* Spelling error correction. [#4531](https://github.com/yandex/ClickHouse/pull/4531) ([sdk2](https://github.com/sdk2))
 
 ### Improvement
 * Support aliases in JOIN ON section for right table columns [#4412](https://github.com/yandex/ClickHouse/pull/4412) ([Artem Zuikov](https://github.com/4ertus2))
-* Multiple JOINS with some restrictions: no asterisks, no complex aliases in ON/WHERE/GROUP BY/... [#4462](https://github.com/yandex/ClickHouse/pull/4462) ([Artem Zuikov](https://github.com/4ertus2))
+* Cleanup distributed DDL queue in a separate thread so that it doesn't slow down the main loop that processes distributed DDL tasks. [#4502](https://github.com/yandex/ClickHouse/pull/4502) ([Alex Zatelepin](https://github.com/ztlpn))
 * Result of multiple JOINs need correct result names to be used in subselects. Replace flat aliases with source names in result. [#4474](https://github.com/yandex/ClickHouse/pull/4474) ([Artem Zuikov](https://github.com/4ertus2))
 *  [#4480](https://github.com/yandex/ClickHouse/pull/4480) ([Artem Zuikov](https://github.com/4ertus2))
 *  [#4493](https://github.com/yandex/ClickHouse/pull/4493) ([Vitaly Baranov](https://github.com/vitlibar))
 
 ### Performance Improvement
 * Improved heuristics of "move to PREWHERE" optimization. [#4405](https://github.com/yandex/ClickHouse/pull/4405) ([alexey-milovidov](https://github.com/alexey-milovidov))
+* Use proper lookup tables that uses HashTable's API for 8-bit and 16-bit keys. [#4536](https://github.com/yandex/ClickHouse/pull/4536) ([Amos Bird](https://github.com/amosbird))
 *  [#4465](https://github.com/yandex/ClickHouse/pull/4465) ([Vitaly Baranov](https://github.com/vitlibar))
 * Improved performance of string comparison. [#4564](https://github.com/yandex/ClickHouse/pull/4564) ([alexey-milovidov](https://github.com/alexey-milovidov))
 * When `min_bytes_to_use_direct_io` is set to 1, not every file was opened with O_DIRECT mode because the data size to read was sometimes underestimated by the size of one compressed block. [#4526](https://github.com/yandex/ClickHouse/pull/4526) ([alexey-milovidov](https://github.com/alexey-milovidov))