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Alexey Milovidov 2022-03-17 01:05:15 +01:00
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* Improve performance of insertion into `MergeTree` tables by optimizing sorting. Up to 2x improvement is observed on realistic benchmarks. [#34750](https://github.com/ClickHouse/ClickHouse/pull/34750) ([Maksim Kita](https://github.com/kitaisreal)). * Improve performance of insertion into `MergeTree` tables by optimizing sorting. Up to 2x improvement is observed on realistic benchmarks. [#34750](https://github.com/ClickHouse/ClickHouse/pull/34750) ([Maksim Kita](https://github.com/kitaisreal)).
* Columns pruning when reading Parquet, ORC and Arrow files from URL and S3. Closes [#34163](https://github.com/ClickHouse/ClickHouse/issues/34163). [#34849](https://github.com/ClickHouse/ClickHouse/pull/34849) ([Kseniia Sumarokova](https://github.com/kssenii)). * Columns pruning when reading Parquet, ORC and Arrow files from URL and S3. Closes [#34163](https://github.com/ClickHouse/ClickHouse/issues/34163). [#34849](https://github.com/ClickHouse/ClickHouse/pull/34849) ([Kseniia Sumarokova](https://github.com/kssenii)).
* Columns pruning when reading Parquet, ORC and Arrow files from Hive. [#34954](https://github.com/ClickHouse/ClickHouse/pull/34954) ([lgbo](https://github.com/lgbo-ustc)). * Columns pruning when reading Parquet, ORC and Arrow files from Hive. [#34954](https://github.com/ClickHouse/ClickHouse/pull/34954) ([lgbo](https://github.com/lgbo-ustc)).
* A bunch of performance optimizations from a performance superhero. Improve performance of processing queries with large `IN` section. Improve performance of `DirectDictionary` if dictionary source is `ClickHouse`. Improve performance of `detectCharset `, `detectLanguageUnknown ` functions. [#34888](https://github.com/ClickHouse/ClickHouse/pull/34888) ([Maksim Kita](https://github.com/kitaisreal)).
* Improve performance of `any` aggregate function by using more batching. [#34760](https://github.com/ClickHouse/ClickHouse/pull/34760) ([Raúl Marín](https://github.com/Algunenano)). * Improve performance of `any` aggregate function by using more batching. [#34760](https://github.com/ClickHouse/ClickHouse/pull/34760) ([Raúl Marín](https://github.com/Algunenano)).
* Multiple improvements for performance of `clickhouse-keeper`: less locking [#35010](https://github.com/ClickHouse/ClickHouse/pull/35010) ([zhanglistar](https://github.com/zhanglistar)), lower memory usage by streaming reading and writing of snapshot instead of full copy. [#34584](https://github.com/ClickHouse/ClickHouse/pull/34584) ([zhanglistar](https://github.com/zhanglistar)), optimizing compaction of log store in the RAFT implementation. [#34534](https://github.com/ClickHouse/ClickHouse/pull/34534) ([zhanglistar](https://github.com/zhanglistar)), versioning of the internal data structure [#34486](https://github.com/ClickHouse/ClickHouse/pull/34486) ([zhanglistar](https://github.com/zhanglistar)). * Multiple improvements for performance of `clickhouse-keeper`: less locking [#35010](https://github.com/ClickHouse/ClickHouse/pull/35010) ([zhanglistar](https://github.com/zhanglistar)), lower memory usage by streaming reading and writing of snapshot instead of full copy. [#34584](https://github.com/ClickHouse/ClickHouse/pull/34584) ([zhanglistar](https://github.com/zhanglistar)), optimizing compaction of log store in the RAFT implementation. [#34534](https://github.com/ClickHouse/ClickHouse/pull/34534) ([zhanglistar](https://github.com/zhanglistar)), versioning of the internal data structure [#34486](https://github.com/ClickHouse/ClickHouse/pull/34486) ([zhanglistar](https://github.com/zhanglistar)).