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Changelog heredoc added backward incompatible change

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Maksim Kita 2021-09-29 15:54:23 +03:00
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CHANGELOG.md
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* Under clickhouse-local, always treat local addresses with a port as remote. [#26736](https://github.com/ClickHouse/ClickHouse/pull/26736) ([Raúl Marín](https://github.com/Algunenano)).
* Fix the issue that in case of some sophisticated query with column aliases identical to the names of expressions, bad cast may happen. This fixes [#25447](https://github.com/ClickHouse/ClickHouse/issues/25447). This fixes [#26914](https://github.com/ClickHouse/ClickHouse/issues/26914). This fix may introduce backward incompatibility: if there are different expressions with identical names, exception will be thrown. It may break some rare cases when `enable_optimize_predicate_expression` is set. [#26639](https://github.com/ClickHouse/ClickHouse/pull/26639) ([alexey-milovidov](https://github.com/alexey-milovidov)).
* Now, scalar subquery always returns `Nullable` result if it's type can be `Nullable`. It is needed because in case of empty subquery it's result should be `Null`. Previously, it was possible to get error about incompatible types (type deduction does not execute scalar subquery, and it could use not-nullable type). Scalar subquery with empty result which can't be converted to `Nullable` (like `Array` or `Tuple`) now throws error. Fixes [#25411](https://github.com/ClickHouse/ClickHouse/issues/25411). [#26423](https://github.com/ClickHouse/ClickHouse/pull/26423) ([Nikolai Kochetov](https://github.com/KochetovNicolai)).
* Introduce syntax for here documents. Example `SELECT $doc$ VALUE $doc$`. [#26671](https://github.com/ClickHouse/ClickHouse/pull/26671) ([Maksim Kita](https://github.com/kitaisreal)). This change is backward incompatible if in query there are identifiers that contain `$` [#28768](https://github.com/ClickHouse/ClickHouse/issues/28768).
#### New Feature
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* Added integration with S2 geometry library. [#24980](https://github.com/ClickHouse/ClickHouse/pull/24980) ([Andr0901](https://github.com/Andr0901)). ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
* Add SQLite table engine, table function, database engine. [#24194](https://github.com/ClickHouse/ClickHouse/pull/24194) ([Arslan Gumerov](https://github.com/g-arslan)). ([Kseniia Sumarokova](https://github.com/kssenii)).
* Added support for custom query for `MySQL`, `PostgreSQL`, `ClickHouse`, `JDBC`, `Cassandra` dictionary source. Closes [#1270](https://github.com/ClickHouse/ClickHouse/issues/1270). [#26995](https://github.com/ClickHouse/ClickHouse/pull/26995) ([Maksim Kita](https://github.com/kitaisreal)).
* Introduce syntax for here documents. Example `SELECT $doc$ VALUE $doc$`. [#26671](https://github.com/ClickHouse/ClickHouse/pull/26671) ([Maksim Kita](https://github.com/kitaisreal)).
* Add shared (replicated) storage of user, roles, row policies, quotas and settings profiles through ZooKeeper. [#27426](https://github.com/ClickHouse/ClickHouse/pull/27426) ([Kevin Michel](https://github.com/kmichel-aiven)).
* Add compression for `INTO OUTFILE` that automatically choose compression algorithm. Closes [#3473](https://github.com/ClickHouse/ClickHouse/issues/3473). [#27134](https://github.com/ClickHouse/ClickHouse/pull/27134) ([Filatenkov Artur](https://github.com/FArthur-cmd)).
* Add `INSERT ... FROM INFILE` similarly to `SELECT ... INTO OUTFILE`. [#27655](https://github.com/ClickHouse/ClickHouse/pull/27655) ([Filatenkov Artur](https://github.com/FArthur-cmd)).