clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Skip indexes over mapKeys(m)/mapValues(m) are built from the whole Map; building text and bloom_filter indexes from the keys/values subcolumn cuts MATERIALIZE INDEX 8-64% and INSERT 6-9% (14% on the OpenTelemetry logs schema)
- Concurrent lightweight DELETE can mark an earlier mutation done without applying it
- min/max(col +/- const) returns const instead of 0 over empty global aggregation (optimize_arithmetic_operations_in_aggregate_functions default ON)
- Logical error: Part A intersects next part B. It is a bug or a result of manual intervention (STID: 3562-39cd)
- Remap text index posting lists in bulk when merging parts
- Compact-part column-subset reads over object storage close the HTTP connection after every request
- ReplicatedMergeTree increments `num_tries` when a background executor rejects a task
- Do not build the initiator-side set for a `GLOBAL IN` in `PREWHERE` on a `Distributed` table
- Preserve input sorting for quantile, quantileGK and quantileTDigest
- Fix merges that fill a missing column running TTL they must not apply
- Docs
- C++ not yet supported