clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Wait for background tasks before each storage memory checkpoint
- Feat(PromQL): Support Prometheus /api/v1/features
- Perf(Analyzer): Use String size subcolumn for filters with full String reads
- Skip empty read results in `MergeTreeSelectProcessor::read`
- Do not aggregate in order when a query needs the aggregation overflow row
- Do not distribute a read of input() to parallel replicas with a custom key
- Reject a SETTINGS name that is not a setting at all for the MergeTree family
- An unqualified IN <table> in a TTL DELETE WHERE is accepted at CREATE and stored unqualified, then every TTL merge fails with UNKNOWN_DATABASE and retries forever
- BACKUP of a Buffer table silently loses the buffered acknowledged rows that a graceful restart preserves
- A value inserted into a Variant column is silently stored in the wrong alternative and reinterpreted; literal IN sets over Variant mis-store members the same way, so IN/NOT IN disagree with =
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