2019 Changelog

## ClickHouse Release 19.4[​](#clickhouse-release-19-4 "Direct link to ClickHouse Release 19.4")

### ClickHouse Release 19.4.4.33, 2019-04-17[​](#clickhouse-release-19-4-4-33-2019-04-17 "Direct link to ClickHouse Release 19.4.4.33, 2019-04-17")

#### Bug Fixes[​](#bug-fixes-7 "Direct link to Bug Fixes")

- Avoid `std::terminate` in case of memory allocation failure. Now `std::bad_alloc` exception is thrown as expected. [#4665](https://github.com/ClickHouse/ClickHouse/pull/4665) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fixes `capnproto` reading from buffer. Sometimes files wasn't loaded successfully by HTTP. [#4674](https://github.com/ClickHouse/ClickHouse/pull/4674) ([Vladislav](https://github.com/smirnov-vs))
- Fix error `Unknown log entry type: 0` after `OPTIMIZE TABLE FINAL` query. [#4683](https://github.com/ClickHouse/ClickHouse/pull/4683) ([Amos Bird](https://github.com/amosbird))
- Wrong arguments to `hasAny` or `hasAll` functions may lead to segfault. [#4698](https://github.com/ClickHouse/ClickHouse/pull/4698) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Deadlock may happen while executing `DROP DATABASE dictionary` query. [#4701](https://github.com/ClickHouse/ClickHouse/pull/4701) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fix undefined behavior in `median` and `quantile` functions. [#4702](https://github.com/ClickHouse/ClickHouse/pull/4702) ([hcz](https://github.com/hczhcz))
- Fix compression level detection when `network_compression_method` in lowercase. Broken in v19.1. [#4706](https://github.com/ClickHouse/ClickHouse/pull/4706) ([proller](https://github.com/proller))
- Fixed ignorance of `<timezone>UTC</timezone>` setting (fixes issue [#4658](https://github.com/ClickHouse/ClickHouse/issues/4658)). [#4718](https://github.com/ClickHouse/ClickHouse/pull/4718) ([proller](https://github.com/proller))
- Fix `histogram` function behaviour with `Distributed` tables. [#4741](https://github.com/ClickHouse/ClickHouse/pull/4741) ([olegkv](https://github.com/olegkv))
- Fixed tsan report `destroy of a locked mutex`. [#4742](https://github.com/ClickHouse/ClickHouse/pull/4742) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fixed TSan report on shutdown due to race condition in system logs usage. Fixed potential use-after-free on shutdown when part\_log is enabled. [#4758](https://github.com/ClickHouse/ClickHouse/pull/4758) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fix recheck parts in `ReplicatedMergeTreeAlterThread` in case of error. [#4772](https://github.com/ClickHouse/ClickHouse/pull/4772) ([Nikolai Kochetov](https://github.com/KochetovNicolai))
- Arithmetic operations on intermediate aggregate function states were not working for constant arguments (such as subquery results). [#4776](https://github.com/ClickHouse/ClickHouse/pull/4776) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Always backquote column names in metadata. Otherwise it's impossible to create a table with column named `index` (server won't restart due to malformed `ATTACH` query in metadata). [#4782](https://github.com/ClickHouse/ClickHouse/pull/4782) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fix crash in `ALTER ... MODIFY ORDER BY` on `Distributed` table. [#4790](https://github.com/ClickHouse/ClickHouse/pull/4790) ([TCeason](https://github.com/TCeason))
- Fix segfault in `JOIN ON` with enabled `enable_optimize_predicate_expression`. [#4794](https://github.com/ClickHouse/ClickHouse/pull/4794) ([Winter Zhang](https://github.com/zhang2014))
- Fix bug with adding an extraneous row after consuming a protobuf message from Kafka. [#4808](https://github.com/ClickHouse/ClickHouse/pull/4808) ([Vitaly Baranov](https://github.com/vitlibar))
- Fix segmentation fault in `clickhouse-copier`. [#4835](https://github.com/ClickHouse/ClickHouse/pull/4835) ([proller](https://github.com/proller))
- Fixed race condition in `SELECT` from `system.tables` if the table is renamed or altered concurrently. [#4836](https://github.com/ClickHouse/ClickHouse/pull/4836) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fixed data race when fetching data part that is already obsolete. [#4839](https://github.com/ClickHouse/ClickHouse/pull/4839) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fixed rare data race that can happen during `RENAME` table of MergeTree family. [#4844](https://github.com/ClickHouse/ClickHouse/pull/4844) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fixed segmentation fault in function `arrayIntersect`. Segmentation fault could happen if function was called with mixed constant and ordinary arguments. [#4847](https://github.com/ClickHouse/ClickHouse/pull/4847) ([Lixiang Qian](https://github.com/fancyqlx))
- Fixed reading from `Array(LowCardinality)` column in rare case when column contained a long sequence of empty arrays. [#4850](https://github.com/ClickHouse/ClickHouse/pull/4850) ([Nikolai Kochetov](https://github.com/KochetovNicolai))
- Fix `No message received` exception while fetching parts between replicas. [#4856](https://github.com/ClickHouse/ClickHouse/pull/4856) ([alesapin](https://github.com/alesapin))
- Fixed `arrayIntersect` function wrong result in case of several repeated values in single array. [#4871](https://github.com/ClickHouse/ClickHouse/pull/4871) ([Nikolai Kochetov](https://github.com/KochetovNicolai))
- Fix a race condition during concurrent `ALTER COLUMN` queries that could lead to a server crash (fixes issue [#3421](https://github.com/ClickHouse/ClickHouse/issues/3421)). [#4592](https://github.com/ClickHouse/ClickHouse/pull/4592) ([Alex Zatelepin](https://github.com/ztlpn))
- Fix parameter deduction in `ALTER MODIFY` of column `CODEC` when column type is not specified. [#4883](https://github.com/ClickHouse/ClickHouse/pull/4883) ([alesapin](https://github.com/alesapin))
- Functions `cutQueryStringAndFragment()` and `queryStringAndFragment()` now works correctly when `URL` contains a fragment and no query. [#4894](https://github.com/ClickHouse/ClickHouse/pull/4894) ([Vitaly Baranov](https://github.com/vitlibar))
- Fix rare bug when setting `min_bytes_to_use_direct_io` is greater than zero, which occures when thread have to seek backward in column file. [#4897](https://github.com/ClickHouse/ClickHouse/pull/4897) ([alesapin](https://github.com/alesapin))
- Fix wrong argument types for aggregate functions with `LowCardinality` arguments (fixes issue [#4919](https://github.com/ClickHouse/ClickHouse/issues/4919)). [#4922](https://github.com/ClickHouse/ClickHouse/pull/4922) ([Nikolai Kochetov](https://github.com/KochetovNicolai))
- Fix function `toISOWeek` result for year 1970. [#4988](https://github.com/ClickHouse/ClickHouse/pull/4988) ([alexey-milovidov](https://github.com/alexey-milovidov))
- Fix `DROP`, `TRUNCATE` and `OPTIMIZE` queries duplication, when executed on `ON CLUSTER` for `ReplicatedMergeTree*` tables family. [#4991](https://github.com/ClickHouse/ClickHouse/pull/4991) ([alesapin](https://github.com/alesapin))

#### Improvements[​](#improvements-2 "Direct link to Improvements")

- Keep ordinary, `DEFAULT`, `MATERIALIZED` and `ALIAS` columns in a single list (fixes issue [#2867](https://github.com/ClickHouse/ClickHouse/issues/2867)). [#4707](https://github.com/ClickHouse/ClickHouse/pull/4707) ([Alex Zatelepin](https://github.com/ztlpn))

### ClickHouse Release 19.4.3.11, 2019-04-02[​](#clickhouse-release-19-4-3-11-2019-04-02 "Direct link to ClickHouse Release 19.4.3.11, 2019-04-02")

#### Bug Fixes[​](#bug-fixes-8 "Direct link to Bug Fixes")

- Fix crash in `FULL/RIGHT JOIN` when we joining on nullable vs not nullable. [#4855](https://github.com/ClickHouse/ClickHouse/pull/4855) ([Artem Zuikov](https://github.com/4ertus2))
- Fix segmentation fault in `clickhouse-copier`. [#4835](https://github.com/ClickHouse/ClickHouse/pull/4835) ([proller](https://github.com/proller))

#### Build/Testing/Packaging Improvement[​](#buildtestingpackaging-improvement-11 "Direct link to Build/Testing/Packaging Improvement")