clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- A logically-inert "true AND" wrapper around NOT(has(arr, x) AND arrayJoin(arr) = x) causes 20x+ memory blowup in ARRAY JOIN
- Support OUTER JOIN with an inequality key
- Add CHECK TABLE ... REMOTE for lightweight remote storage validation
- Correlated subquery with `group_by_use_nulls = 1` and `WITH ROLLUP/WITH CUBE` causes logical error
- Fix SYSTEM SYNC MERGES hanging when a scheduled part does not exist
- Add lazy partition read option for in-order reading
- Propagate OpenTelemetry context to S3 and Azure
- Logical error: Pipeline stuck still happens
- ODBC Table Function Truncates Milliseconds from DateTime Values
- Improvements to keeper-utils analyze-snapshot
- Docs
- C++ not yet supported