clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- ClickHouse Keeper causing replicas to turn into read-only mode
- Stateless test `02497_remote_disk_fat_column` is flaky (`Memory limit (for query) exceeded`)
- LIKE operator does not correctly extract tokens from patterns for fulltext/tokenbf_v1 index analysis
- use hardlinks instead copy for broken parts in S3
- LOGICAL_ERROR: Source part is not covered by result part when reaching LEGACY_MAX_LEVEL
- Several ldap servers in config or multiple OUs in base_dn?
- Parameterized views: Support DESCRIBE queries & scalar expressions in new analyzer
- Projections is not used with count(if()) aggregations containing alias columns
- user / role / row policy creation slows down queries
- Projections doesn't work properly if not `MATERIALIZE` when projection added
- Docs
- C++ not yet supported