clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Forward logs from distributed plan workers to the coordinator
- Keeper max_memory_usage_soft_limit is open-loop: under RSS-driven saturation it refuses writes indefinitely without relieving memory, and blocks disk eviction to S3 (ends in disk-full abort)
- Flaky test: 03234_get_setting_or_default
- Add experimental `bloom_sliced` text skip index (bit-sliced Bloom signatures)
- fix parallel_inserts setting parsing for S3Queue
- Fix possible logical error "Unexpected substream ... for column ..." during bump of compatibility setting
- s3queue - add `buckets_per_partition` for better parallelization
- Fix flaky test_long_disconnection_stops_backup: allow transient UNKNOWN_TABLE
- Log tolerated connection failures to remote MySQL/PostgreSQL databases as warnings instead of errors
- Materialize column statistics on INSERT for small tables by default
- Docs
- C++ not yet supported