clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- A pre-26.9 table with an `arrayJoin` CHECK constraint wedges new `Replicated` database replicas readonly and refuses to RESTORE from backup, while plain boot still loads it
- Converting a table with table_readonly = 1 to ReplicatedMergeTree yields a table whose backup refuses to RESTORE and whose DETACH cannot be re-ATTACHed
- distinctJSONPaths(AndTypes) insert typed paths unconditionally, ignoring the new setting
- JSONHas/JSONExtractRaw take the literal-only branch for typed paths, ignoring sub-objects
- null_as_default writes out-of-domain Enum 0 in JSONEachRow/CSV/TSV (Values is correct)
- 100 MB codec threshold compares a codec-dependent size: merges flip LZ4<->ZSTD forever
- Automatically make queries use spilling when reaching memory limits
- Implicit min-max index of an ALIAS column makes INSERT fail when the alias expression cannot be evaluated
- [RFC] OpenTelemetry tracing and introspection of distributed queries
- CLEAR COLUMN does not free a column that a skip index depends on in a packed part
- Docs
- C++ not yet supported