clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Predicate statistics log (selectivity collection)
- Slow CREATE/DELETE and SYSTEM SYNC REPLICA suddenly appeared
- Reduce lock contention in MergeTreeBackgroundExecutor
- [WIP] Byte stream split Codec
- Auto-size background thread pool defaults based on CPU cores
- Upgrade POCO to use PCRE2
- Skip writing all-default columns during MergeTree INSERT
- ClickHouse Keeper may trigger excessive Transparent Huge Page (THP) PMD collapse inside Docker
- Transitive join predicates
- Revert dangerous change in CreateUniqueArrayJoinAliasesVisitor
- Docs
- C++ not yet supported