clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Make the adaptive timeouts for object storage configurable
- max_local_read_bandwidth_for_server throttles reads served from the OS page cache
- WASM UDF input splitting over-prices `Buffers` batches for `LowCardinality`, `Dynamic` and `Variant`
- Read-in-order returns wrong order (wrong rows under `LIMIT`) when the `ORDER BY` expression maps a stored `inf` to `NaN`: `ORDER BY x / inf` over a key holding `-inf` places `NaN` first at default settings
- Query result cache: evict LRU entries when the cache is full and nothing has expired
- Table with a lambda over a non-deterministic function in the sorting key refuses to load after upgrade; DROP, DETACH and SHOW TABLES on its database all fail
- 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
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- C++ not yet supported