2020 Changelog

- Fixed performance issue, while reading from compact parts. [#12492](https://github.com/ClickHouse/ClickHouse/pull/12492) ([Anton Popov](https://github.com/CurtizJ)).
- Fixed backwards compatibility in binary format of `AggregateFunction(avg, ...)` values. This fixes [#12342](https://github.com/ClickHouse/ClickHouse/issues/12342). [#12486](https://github.com/ClickHouse/ClickHouse/pull/12486) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed SETTINGS parse after FORMAT. [#12480](https://github.com/ClickHouse/ClickHouse/pull/12480) ([Azat Khuzhin](https://github.com/azat)).
- Fixed the deadlock if `text_log` is enabled. [#12452](https://github.com/ClickHouse/ClickHouse/pull/12452) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed overflow when very large `LIMIT` or `OFFSET` is specified. This fixes [#10470](https://github.com/ClickHouse/ClickHouse/issues/10470). This fixes [#11372](https://github.com/ClickHouse/ClickHouse/issues/11372). [#12427](https://github.com/ClickHouse/ClickHouse/pull/12427) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed possible segfault if `StorageMerge`. This fixes [#12054](https://github.com/ClickHouse/ClickHouse/issues/12054). [#12401](https://github.com/ClickHouse/ClickHouse/pull/12401) ([tavplubix](https://github.com/tavplubix)).
- Reverted change introduced in [#11079](https://github.com/ClickHouse/ClickHouse/issues/11079) to resolve [#12098](https://github.com/ClickHouse/ClickHouse/issues/12098). [#12397](https://github.com/ClickHouse/ClickHouse/pull/12397) ([Mike](https://github.com/myrrc)).
- Additional check for arguments of bloom filter index. This fixes [#11408](https://github.com/ClickHouse/ClickHouse/issues/11408). [#12388](https://github.com/ClickHouse/ClickHouse/pull/12388) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Avoid exception when negative or floating point constant is used in WHERE condition for indexed tables. This fixes [#11905](https://github.com/ClickHouse/ClickHouse/issues/11905). [#12384](https://github.com/ClickHouse/ClickHouse/pull/12384) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Allowed to `CLEAR` column even if there are depending `DEFAULT` expressions. This fixes [#12333](https://github.com/ClickHouse/ClickHouse/issues/12333). [#12378](https://github.com/ClickHouse/ClickHouse/pull/12378) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fix `TOTALS/ROLLUP/CUBE` for aggregate functions with `-State` and `Nullable` arguments. This fixes [#12163](https://github.com/ClickHouse/ClickHouse/issues/12163). [#12376](https://github.com/ClickHouse/ClickHouse/pull/12376) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed error message and exit codes for `ALTER RENAME COLUMN` queries, when `RENAME` is not allowed. Fixes [#12301](https://github.com/ClickHouse/ClickHouse/issues/12301) and [#12303](https://github.com/ClickHouse/ClickHouse/issues/12303). [#12335](https://github.com/ClickHouse/ClickHouse/pull/12335) ([alesapin](https://github.com/alesapin)).
- Fixed very rare race condition in `ReplicatedMergeTreeQueue`. [#12315](https://github.com/ClickHouse/ClickHouse/pull/12315) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- When using codec `Delta` or `DoubleDelta` with non fixed width types, exception with code `LOGICAL_ERROR` was returned instead of exception with code `BAD_ARGUMENTS` (we ensure that exceptions with code logical error never happen). This fixes [#12110](https://github.com/ClickHouse/ClickHouse/issues/12110). [#12308](https://github.com/ClickHouse/ClickHouse/pull/12308) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed order of columns in `WITH FILL` modifier. Previously order of columns of `ORDER BY` statement wasn't respected. [#12306](https://github.com/ClickHouse/ClickHouse/pull/12306) ([Anton Popov](https://github.com/CurtizJ)).
- Avoid "bad cast" exception when there is an expression that filters data by virtual columns (like `_table` in `Merge` tables) or by "index" columns in system tables such as filtering by database name when querying from `system.tables`, and this expression returns `Nullable` type. This fixes [#12166](https://github.com/ClickHouse/ClickHouse/issues/12166). [#12305](https://github.com/ClickHouse/ClickHouse/pull/12305) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed `TTL` after renaming column, on which depends TTL expression. [#12304](https://github.com/ClickHouse/ClickHouse/pull/12304) ([Anton Popov](https://github.com/CurtizJ)).
- Fixed SIGSEGV if there is an message with error in the middle of the batch in `Kafka` Engine. [#12302](https://github.com/ClickHouse/ClickHouse/pull/12302) ([Azat Khuzhin](https://github.com/azat)).
- Fixed the situation when some threads might randomly hang for a few seconds during `DNS` cache updating. [#12296](https://github.com/ClickHouse/ClickHouse/pull/12296) ([tavplubix](https://github.com/tavplubix)).
- Fixed typo in setting name. [#12292](https://github.com/ClickHouse/ClickHouse/pull/12292) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Show error after `TrieDictionary` failed to load. [#12290](https://github.com/ClickHouse/ClickHouse/pull/12290) ([Vitaly Baranov](https://github.com/vitlibar)).
- The function `arrayFill` worked incorrectly for empty arrays that may lead to crash. This fixes [#12263](https://github.com/ClickHouse/ClickHouse/issues/12263). [#12279](https://github.com/ClickHouse/ClickHouse/pull/12279) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Implement conversions to the common type for `LowCardinality` types. This allows to execute UNION ALL of tables with columns of LowCardinality and other columns. This fixes [#8212](https://github.com/ClickHouse/ClickHouse/issues/8212). This fixes [#4342](https://github.com/ClickHouse/ClickHouse/issues/4342). [#12275](https://github.com/ClickHouse/ClickHouse/pull/12275) ([alexey-milovidov](https://github.com/alexey-milovidov)).
- Fixed the behaviour on reaching redirect limit in request to `S3` storage. [#12256](https://github.com/ClickHouse/ClickHouse/pull/12256) ([ianton-ru](https://github.com/ianton-ru)).
- Fixed the behaviour when during multiple sequential inserts in `StorageFile` header for some special types was written more than once. This fixed [#6155](https://github.com/ClickHouse/ClickHouse/issues/6155). [#12197](https://github.com/ClickHouse/ClickHouse/pull/12197) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
- Fixed logical functions for UInt8 values when they are not equal to 0 or 1. [#12196](https://github.com/ClickHouse/ClickHouse/pull/12196) ([Alexander Kazakov](https://github.com/Akazz)).
- Cap max\_memory\_usage\* limits to the process resident memory. [#12182](https://github.com/ClickHouse/ClickHouse/pull/12182) ([Azat Khuzhin](https://github.com/azat)).
- Fix dictGet arguments check during `GROUP BY` injective functions elimination. [#12179](https://github.com/ClickHouse/ClickHouse/pull/12179) ([Azat Khuzhin](https://github.com/azat)).
- Fixed the behaviour when `SummingMergeTree` engine sums up columns from partition key. Added an exception in case of explicit definition of columns to sum which intersects with partition key columns. This fixes [#7867](https://github.com/ClickHouse/ClickHouse/issues/7867). [#12173](https://github.com/ClickHouse/ClickHouse/pull/12173) ([Nikita Mikhaylov](https://github.com/nikitamikhaylov)).
- Don't split the dictionary source's table name into schema and table name itself if ODBC connection does not support schema. [#12165](https://github.com/ClickHouse/ClickHouse/pull/12165) ([Vitaly Baranov](https://github.com/vitlibar)).
- Fixed wrong logic in `ALTER DELETE` that leads to deleting of records when condition evaluates to NULL. This fixes [#9088](https://github.com/ClickHouse/ClickHouse/issues/9088). This closes [#12106](https://github.com/ClickHouse/ClickHouse/issues/12106). [#12153](https://github.com/ClickHouse/ClickHouse/pull/12153) ([alexey-milovidov](https://github.com/alexey-milovidov)).