clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Iceberg read-in-order returns unsorted rows when data files outnumber streams
- `latest_sequence_number` is NULL for format v1 Iceberg snapshots instead of 0
- `ADD COLUMN x, MODIFY COLUMN x` throws `LOGICAL_ERROR` if `x` names a subcolumn
- Codec of Tuple element `a.b` also hits `JSON`/`Dynamic` element `a`'s streams
- Refreshable MV with subcolumn codecs fails every refresh: `SUPPORT_IS_DISABLED`
- Footer check rejects absent `Footer.version`: Arrow Java < 1.0 files fail
- Rewrite `replxx`
- Rewrite `rdkafka`
- Query result cache: keep the `ORDER BY` of a cached subquery
- Perf* ProfileEvents diffed against previous query's closed descriptors
- Docs
- C++ not yet supported