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Changelog for 19.5.1.246

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## ClickHouse release 19.5.1.246, 2019-04-15
### New Features
* Hyperscan string search matching was added. [#4780](https://github.com/yandex/ClickHouse/pull/4780) ([Danila Kutenin](https://github.com/danlark1))
* Implement the predefined expression filter per row for tables. [#4792](https://github.com/yandex/ClickHouse/pull/4792) ([Ivan](https://github.com/abyss7))
* Added hyperscan fuzzy search. [#4841](https://github.com/yandex/ClickHouse/pull/4841) ([Danila Kutenin](https://github.com/danlark1))
* A new type of data skipping indices based on bloom filters (can be used for `equal`, `in` and `like` functions). [#4499](https://github.com/yandex/ClickHouse/pull/4499) ([Nikita Vasilev](https://github.com/nikvas0))
* Added `ASOF JOIN` which allows to run queries that join to the most recent value known. [#4774](https://github.com/yandex/ClickHouse/pull/4774) ([Martijn Bakker](https://github.com/Gladdy))
* Rewrite multiple `COMMA JOINS` to `CROSS JOINS`. Then rewrite them to INNER JOINs if possible. [#4661](https://github.com/yandex/ClickHouse/pull/4661) ([Artem Zuikov](https://github.com/4ertus2))
### Improvement
* `topK` and `topKWeighted` now supports custom `loadFactor` (fixes #4252). [#4634](https://github.com/yandex/ClickHouse/pull/4634) ([Kirill Danshin](https://github.com/kirillDanshin))
* Allow to use `parallel_replicas_count > 1` even for tables without sampling (the setting is simply ignored for them). In previous versions it was lead to exception. [#4637](https://github.com/yandex/ClickHouse/pull/4637) ([Alexey Elymanov](https://github.com/digitalist))
* Support for `CREATE OR REPLACE VIEW`. Allow to create a view or set a new definition in a single statement. [#4654](https://github.com/yandex/ClickHouse/pull/4654) ([Boris Granveaud](https://github.com/bgranvea))
* `Buffer` table engine now supports `PREWHERE`. [#4671](https://github.com/yandex/ClickHouse/pull/4671) ([Yangkuan Liu](https://github.com/LiuYangkuan))
* Add ability to start replicated table without metadata in zookeeper in `readonly` mode. [#4691](https://github.com/yandex/ClickHouse/pull/4691) ([alesapin](https://github.com/alesapin))
* Fixed flicker of progress bar in clickhouse-client. The issue was most noticeable when using `FORMAT Null` with streaming queries. [#4811](https://github.com/yandex/ClickHouse/pull/4811) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Allow to disable functions with `hyperscan` library on per user basis to limit potentially excessive and uncontrolled resource usage. [#4816](https://github.com/yandex/ClickHouse/pull/4816) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Print version number in all errors [#4824](https://github.com/yandex/ClickHouse/pull/4824) ([proller](https://github.com/proller))
* Hyperscan API requires string sizes to fit in unsigned int. Throw an exception if not. Added restriction to the multiSearch functions. [#4834](https://github.com/yandex/ClickHouse/pull/4834) ([Danila Kutenin](https://github.com/danlark1))
* Adapt the ASOF join strictness to support multiple column types. [#4863](https://github.com/yandex/ClickHouse/pull/4863) ([Martijn Bakker](https://github.com/Gladdy))
* Improved usage of scratch space and error handling Hyperscan. [#4866](https://github.com/yandex/ClickHouse/pull/4866) ([Danila Kutenin](https://github.com/danlark1))
* Fill `system.graphite_detentions` from a table config of `*GraphiteMergeTree` engine tables. [#4584](https://github.com/yandex/ClickHouse/pull/4584) ([Mikhail f. Shiryaev](https://github.com/Felixoid))
* Rename `trigramDistance` function to `ngramDistance` and add more functions with `CaseInsensitive` and `UTF`. [#4602](https://github.com/yandex/ClickHouse/pull/4602) ([Danila Kutenin](https://github.com/danlark1))
* Improved data skipping indices calculation. [#4640](https://github.com/yandex/ClickHouse/pull/4640) ([Nikita Vasilev](https://github.com/nikvas0)
### Bug Fix
* Avoid `std::terminate` in case of memory allocation failure. Now `std::bad_alloc` exception is thrown as expected. [#4665](https://github.com/yandex/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/yandex/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/yandex/ClickHouse/pull/4683) ([Amos Bird](https://github.com/amosbird))
* Wrong arguments to `hasAny` or `hasAll` functions may lead to segfault. [#4698](https://github.com/yandex/ClickHouse/pull/4698) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Deadlock may happen while executing `DROP DATABASE dictionary` query. [#4701](https://github.com/yandex/ClickHouse/pull/4701) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fix undefinied behavior in `median` and `quantile` functions. [#4702](https://github.com/yandex/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/yandex/ClickHouse/pull/4706) ([proller](https://github.com/proller))
* Keep ordinary, `DEFAULT`, `MATERIALIZED` and `ALIAS` columns in a single list. Fixes #2867 [#4707](https://github.com/yandex/ClickHouse/pull/4707) ([Alex Zatelepin](https://github.com/ztlpn))
* Fixed ignorance of `<timezone>UTC</timezone>` setting (fixes issue #4658). [#4718](https://github.com/yandex/ClickHouse/pull/4718) ([proller](https://github.com/proller))
* Fix `histogram` function behaviour with `Distributed` tables. [#4741](https://github.com/yandex/ClickHouse/pull/4741) ([olegkv](https://github.com/olegkv))
* Fixed tsan report `destroy of a locked mutex`. [#4742](https://github.com/yandex/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/yandex/ClickHouse/pull/4758) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fix recheck parts in ReplicatedMergeTreeAlterThread in case of error. [#4772](https://github.com/yandex/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/yandex/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/yandex/ClickHouse/pull/4782) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fix crash in `ALTER ... MODIFY ORDER BY` on Distributed table. [#4790](https://github.com/yandex/ClickHouse/pull/4790) ([TCeason](https://github.com/TCeason))
* Fix segfault in `JOIN ON` with enabled `enable_optimize_predicate_expression`. [#4794](https://github.com/yandex/ClickHouse/pull/4794) ([Winter Zhang](https://github.com/zhang2014))
* Fix MacOs build [#4804](https://github.com/yandex/ClickHouse/pull/4804) ([Danila Kutenin](https://github.com/danlark1))
* Fix bug with adding an extraneous row after consuming a protobuf message from Kafka. [#4808](https://github.com/yandex/ClickHouse/pull/4808) ([Vitaly Baranov](https://github.com/vitlibar))
* Fix crash of JOIN on not-nullable vs nullable column. Fix NULLs in right keys in ANY JOIN + join_use_nulls. [#4815](https://github.com/yandex/ClickHouse/pull/4815) ([Artem Zuikov](https://github.com/4ertus2))
* Fix segmentation fault in clickhouse-copier. [#4835](https://github.com/yandex/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/yandex/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/yandex/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/yandex/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/yandex/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/yandex/ClickHouse/pull/4850) ([Nikolai Kochetov](https://github.com/KochetovNicolai))
* Fix crash in `FULL/RIGHT JOIN` when we joining on nullable vs not nullable [#4855](https://github.com/yandex/ClickHouse/pull/4855) ([Artem Zuikov](https://github.com/4ertus2))
* Fix `No message received` exception while fetching parts between replicas. [#4856](https://github.com/yandex/ClickHouse/pull/4856) ([alesapin](https://github.com/alesapin))
* Fix bug with incorrect timestamp for the right-hand table of the ASOF join. [#4867](https://github.com/yandex/ClickHouse/pull/4867) ([Martijn Bakker](https://github.com/Gladdy))
* Fixed `arrayIntersect` function wrong result in case of several repeated values in single array. [#4871](https://github.com/yandex/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). [#4592](https://github.com/yandex/ClickHouse/pull/4592) ([Alex Zatelepin](https://github.com/ztlpn))
* Fix incorrect result in `FULL/RIGHT JOIN` with const column. [#4723](https://github.com/yandex/ClickHouse/pull/4723) ([Artem Zuikov](https://github.com/4ertus2))
* Fix duplicates in `GLOBAL JOIN` with asterisk. [#4705](https://github.com/yandex/ClickHouse/pull/4705) ([Artem Zuikov](https://github.com/4ertus2))
### Backward Incompatible Change
* Rename setting `insert_sample_with_metadata` to setting `input_format_defaults_for_omitted_fields`. [#4771](https://github.com/yandex/ClickHouse/pull/4771) ([Artem Zuikov](https://github.com/4ertus2))
* Added setting `max_partitions_per_insert_block` (with value 100 by default). If inserted block contains larger number of partitions, an exception is thrown. Set it to 0 if you want to remove the limit (not recommended). [#4845](https://github.com/yandex/ClickHouse/pull/4845) ([alexey-milovidov](https://github.com/alexey-milovidov))
### Performance Improvement
* Optimize Volnitsky searcher by inlining, giving about 5-10% search improvement for queries with many needles or many similar bigrams. [#4862](https://github.com/yandex/ClickHouse/pull/4862) ([Danila Kutenin](https://github.com/danlark1))
### Build/Testing/Packaging Improvement
* Hardening debug build: more granular memory mappings and ASLR; add memory protection for mark cache and index. This allows to find more memory stomping bugs in case when ASan and MSan cannot do it. [#4632](https://github.com/yandex/ClickHouse/pull/4632) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Add support for cmake variables ENABLE_PROTOBUF, ENABLE_PARQUET and ENABLE_BROTLI which allows to enable/disable the above features (same as we can do for librdkafka, mysql, etc). [#4669](https://github.com/yandex/ClickHouse/pull/4669) ([Silviu Caragea](https://github.com/silviucpp))
* Add ability to print process list and stacktraces of all threads if some queries are hung after test run. [#4675](https://github.com/yandex/ClickHouse/pull/4675) ([alesapin](https://github.com/alesapin))
* Add retries on `Connection loss` error in `clickhouse-test`. [#4682](https://github.com/yandex/ClickHouse/pull/4682) ([alesapin](https://github.com/alesapin))
* Add freebsd build with vagrant and build with thread sanitizer to packager script. [#4712](https://github.com/yandex/ClickHouse/pull/4712) [#4748](https://github.com/yandex/ClickHouse/pull/4748) ([alesapin](https://github.com/alesapin))
* Remove old packages `clickhouse-server-base` and `clickhouse-server-common` from clickhouse. [#4721](https://github.com/yandex/ClickHouse/pull/4721) ([alesapin](https://github.com/alesapin))
* Now user asked for password for user 'default' during installation. [#4725](https://github.com/yandex/ClickHouse/pull/4725) ([proller](https://github.com/proller))
* Suppress warning in `rdkafka` library. [#4740](https://github.com/yandex/ClickHouse/pull/4740) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Allow ability to build without ssl. [#4750](https://github.com/yandex/ClickHouse/pull/4750) ([proller](https://github.com/proller))
* Add a way to launch clickhouse-server image from a custom user [#4753](https://github.com/yandex/ClickHouse/pull/4753) ([Mikhail f. Shiryaev](https://github.com/Felixoid))
* Upgrade contrib boost to 1.69. [#4793](https://github.com/yandex/ClickHouse/pull/4793) ([proller](https://github.com/proller))
* Disable usage of `mremap` when compiled with Thread Sanitizer. Surprisingly enough, TSan does not intercept `mremap` (though it does intercept `mmap`, `munmap`) that leads to false positives. Fixed TSan report in stateful tests. [#4859](https://github.com/yandex/ClickHouse/pull/4859) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Add test checking using format schema via HTTP interface. [#4864](https://github.com/yandex/ClickHouse/pull/4864) ([Vitaly Baranov](https://github.com/vitlibar))
## ClickHouse release 19.4.2.7, 2019-03-30
### Bug Fixes