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Changelog for 19.10

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## ClickHouse release 19.10.1.5, 2019-07-12
### New Feature
* Add new column codec: `T64`. Made for (U)IntX/EnumX/Data(Time)/DecimalX columns. It should be good for columns with constant or small range values. Codec itself allows enlarge or shrink data type without re-compression. [#5557](https://github.com/yandex/ClickHouse/pull/5557) ([Artem Zuikov](https://github.com/4ertus2))
* Add database engine `MySQL` that allow to view all the tables in remote MySQL server [#5599](https://github.com/yandex/ClickHouse/pull/5599) ([Winter Zhang](https://github.com/zhang2014))
* `bitmapContains` implementation. It's 2x faster than `bitmapHasAny` if the second bitmap contains one element. [#5535](https://github.com/yandex/ClickHouse/pull/5535) ([Zhichang Yu](https://github.com/yuzhichang))
* Support for `crc32` function (with behaviour exactly as in MySQL or PHP). Do not use it if you need a hash function. [#5661](https://github.com/yandex/ClickHouse/pull/5661) ([Remen Ivan](https://github.com/BHYCHIK))
* Implemented `SYSTEM START/STOP DISTRIBUTED SENDS` queries to control asynchronous inserts into `Distributed` tables. [#4935](https://github.com/yandex/ClickHouse/pull/4935) ([Winter Zhang](https://github.com/zhang2014))
### Bug Fix
* Ignore query execution limits and max parts size for merge limits while executing mutations. [#5659](https://github.com/yandex/ClickHouse/pull/5659) ([Anton Popov](https://github.com/CurtizJ))
* Fix bug which may lead to deduplication of normal blocks (extremely rare) and insertion of duplicate blocks (more often). [#5549](https://github.com/yandex/ClickHouse/pull/5549) ([alesapin](https://github.com/alesapin))
* Fix of function `arrayEnumerateUniqRanked` for arguments with empty arrays [#5559](https://github.com/yandex/ClickHouse/pull/5559) ([proller](https://github.com/proller))
* Don't subscribe to Kafka topics without intent to poll any messages. [#5698](https://github.com/yandex/ClickHouse/pull/5698) ([Ivan](https://github.com/abyss7))
* Make setting `join_use_nulls` get no effect for types that cannot be inside Nullable [#5700](https://github.com/yandex/ClickHouse/pull/5700) ([Olga Khvostikova](https://github.com/stavrolia))
* Fixed `Incorrect size of index granularity` errors [#5720](https://github.com/yandex/ClickHouse/pull/5720) ([coraxster](https://github.com/coraxster))
* Fix Float to Decimal convert overflow [#5607](https://github.com/yandex/ClickHouse/pull/5607) ([coraxster](https://github.com/coraxster))
* Flush buffer when `WriteBufferFromHDFS`'s destructor is called. This fixes writing into `HDFS`. [#5684](https://github.com/yandex/ClickHouse/pull/5684) ([Xindong Peng](https://github.com/eejoin))
### Improvement
* Treat empty cells in `CSV` as default values when the setting `input_format_defaults_for_omitted_fields` is enabled. [#5625](https://github.com/yandex/ClickHouse/pull/5625) ([akuzm](https://github.com/akuzm))
* Non-blocking loading of external dictionaries. [#5567](https://github.com/yandex/ClickHouse/pull/5567) ([Vitaly Baranov](https://github.com/vitlibar))
* Network timeouts can be dynamically changed for already established connections according to the settings. [#4558](https://github.com/yandex/ClickHouse/pull/4558) ([Konstantin Podshumok](https://github.com/podshumok))
* Using "public_suffix_list" for functions `firstSignificantSubdomain`, `cutToFirstSignificantSubdomain`. It's using a perfect hash table generated by `gperf` with a list generated from the file: [https://publicsuffix.org/list/public_suffix_list.dat](https://publicsuffix.org/list/public_suffix_list.dat). (for example, now we recognize the domain `ac.uk` as non-significant). [#5030](https://github.com/yandex/ClickHouse/pull/5030) ([Guillaume Tassery](https://github.com/YiuRULE))
* Adopted `IPv6` data type in system tables; unified client info columns in `system.processes` and `system.query_log` [#5640](https://github.com/yandex/ClickHouse/pull/5640) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Using sessions for connections with MySQL compatibility protocol. #5476 [#5646](https://github.com/yandex/ClickHouse/pull/5646) ([Yuriy Baranov](https://github.com/yurriy))
* Support more `ALTER` queries `ON CLUSTER`. [#5593](https://github.com/yandex/ClickHouse/pull/5593) [#5613](https://github.com/yandex/ClickHouse/pull/5613) ([sundyli](https://github.com/sundy-li))
* Support `<logger>` section in `clickhouse-local` config file. [#5540](https://github.com/yandex/ClickHouse/pull/5540) ([proller](https://github.com/proller))
* Allow run query with `remote` table function in `clickhouse-local` [#5627](https://github.com/yandex/ClickHouse/pull/5627) ([proller](https://github.com/proller))
### Performance Improvement
* Add the possibility to write the final mark at the end of MergeTree columns. It allows to avoid useless reads for keys that are out of table data range. It is enabled only if adaptive index granularity is in use. [#5624](https://github.com/yandex/ClickHouse/pull/5624) ([alesapin](https://github.com/alesapin))
* Improved performance of MergeTree tables on very slow filesystems by reducing number of `stat` syscalls. [#5648](https://github.com/yandex/ClickHouse/pull/5648) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fixed performance degradation in reading from MergeTree tables that was introduced in version 19.6. Fixes #5631. [#5633](https://github.com/yandex/ClickHouse/pull/5633) ([alexey-milovidov](https://github.com/alexey-milovidov))
### Build/Testing/Packaging Improvement
* Implemented `TestKeeper` as an implementation of ZooKeeper interface used for testing [#5643](https://github.com/yandex/ClickHouse/pull/5643) ([alexey-milovidov](https://github.com/alexey-milovidov)) ([levushkin aleksej](https://github.com/alexey-milovidov))
* From now on `.sql` tests can be run isolated by server, in parallel, with random database. It allows to run them faster, add new tests with custom server configurations, and be sure that different tests doesn't affect each other. [#5554](https://github.com/yandex/ClickHouse/pull/5554) ([Ivan](https://github.com/abyss7))
* Remove `<name>` and `<metrics>` from performance tests [#5672](https://github.com/yandex/ClickHouse/pull/5672) ([Olga Khvostikova](https://github.com/stavrolia))
* Fixed "select_format" performance test for `Pretty` formats [#5642](https://github.com/yandex/ClickHouse/pull/5642) ([alexey-milovidov](https://github.com/alexey-milovidov))
## ClickHouse release 19.9.4.1, 2019-07-05
### Bug Fix
@ -98,7 +140,7 @@
* Batched version of RowRefList for ALL JOINS. [#5267](https://github.com/yandex/ClickHouse/pull/5267) ([Artem Zuikov](https://github.com/4ertus2))
* clickhouse-server: more informative listen error messages. [#5268](https://github.com/yandex/ClickHouse/pull/5268) ([proller](https://github.com/proller))
* Support dictionaries in clickhouse-copier for functions in `<sharding_key>` [#5270](https://github.com/yandex/ClickHouse/pull/5270) ([proller](https://github.com/proller))
* Add new setting `kafka_commit_every_batch` to regulate Kafka committing policy.
* Add new setting `kafka_commit_every_batch` to regulate Kafka committing policy.
It allows to set commit mode: after every batch of messages is handled, or after the whole block is written to the storage. It's a trade-off between losing some messages or reading them twice in some extreme situations. [#5308](https://github.com/yandex/ClickHouse/pull/5308) ([Ivan](https://github.com/abyss7))
* Make `windowFunnel` support other Unsigned Integer Types. [#5320](https://github.com/yandex/ClickHouse/pull/5320) ([sundyli](https://github.com/sundy-li))
* Allow to shadow virtual column `_table` in Merge engine. [#5325](https://github.com/yandex/ClickHouse/pull/5325) ([Ivan](https://github.com/abyss7))
@ -130,15 +172,15 @@ It allows to set commit mode: after every batch of messages is handled, or after
* Fixed FPU clobbering in simdjson library that lead to wrong calculation of `uniqHLL` and `uniqCombined` aggregate function and math functions such as `log`. [#5354](https://github.com/yandex/ClickHouse/pull/5354) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fixed handling mixed const/nonconst cases in JSON functions. [#5435](https://github.com/yandex/ClickHouse/pull/5435) ([Vitaly Baranov](https://github.com/vitlibar))
* Fix `retention` function. Now all conditions that satisfy in a row of data are added to the data state. [#5119](https://github.com/yandex/ClickHouse/pull/5119) ([小路](https://github.com/nicelulu))
* Fix result type for `quantileExact` with Decimals. [#5304](https://github.com/yandex/ClickHouse/pull/5304) ([Artem Zuikov](https://github.com/4ertus2))
* Fix result type for `quantileExact` with Decimals. [#5304](https://github.com/yandex/ClickHouse/pull/5304) ([Artem Zuikov](https://github.com/4ertus2))
### Documentation
* Translate documentation for `CollapsingMergeTree` to chinese. [#5168](https://github.com/yandex/ClickHouse/pull/5168) ([张风啸](https://github.com/AlexZFX))
* Translate some documentation about table engines to chinese.
* Translate some documentation about table engines to chinese.
[#5134](https://github.com/yandex/ClickHouse/pull/5134)
[#5328](https://github.com/yandex/ClickHouse/pull/5328)
([never lee](https://github.com/neverlee))
### Build/Testing/Packaging Improvements
* Fix some sanitizer reports that show probable use-after-free.[#5139](https://github.com/yandex/ClickHouse/pull/5139) [#5143](https://github.com/yandex/ClickHouse/pull/5143) [#5393](https://github.com/yandex/ClickHouse/pull/5393) ([Ivan](https://github.com/abyss7))
@ -220,7 +262,7 @@ Kutenin](https://github.com/danlark1))
([张风啸](https://github.com/AlexZFX)),
[#5068](https://github.com/yandex/ClickHouse/pull/5068) ([never
lee](https://github.com/neverlee))
### Build/Testing/Packaging Improvements
* Print UTF-8 characters properly in `clickhouse-test`.
[#5084](https://github.com/yandex/ClickHouse/pull/5084)
@ -242,7 +284,7 @@ lee](https://github.com/neverlee))
### Bug Fixes
* Fixed IN condition pushdown for queries from table functions `mysql` and `odbc` and corresponding table engines. This fixes #3540 and #2384. [#5313](https://github.com/yandex/ClickHouse/pull/5313) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fix deadlock in Zookeeper. [#5297](https://github.com/yandex/ClickHouse/pull/5297) ([github1youlc](https://github.com/github1youlc))
* Allow quoted decimals in CSV. [#5284](https://github.com/yandex/ClickHouse/pull/5284) ([Artem Zuikov](https://github.com/4ertus2)
* Allow quoted decimals in CSV. [#5284](https://github.com/yandex/ClickHouse/pull/5284) ([Artem Zuikov](https://github.com/4ertus2)
* Disallow conversion from float Inf/NaN into Decimals (throw exception). [#5282](https://github.com/yandex/ClickHouse/pull/5282) ([Artem Zuikov](https://github.com/4ertus2))
* Fix data race in rename query. [#5247](https://github.com/yandex/ClickHouse/pull/5247) ([Winter Zhang](https://github.com/zhang2014))
* Temporarily disable LFAlloc. Usage of LFAlloc might lead to a lot of MAP_FAILED in allocating UncompressedCache and in a result to crashes of queries at high loaded servers. [cfdba93](https://github.com/yandex/ClickHouse/commit/cfdba938ce22f16efeec504f7f90206a515b1280)([Danila Kutenin](https://github.com/danlark1))