clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- SequenceMatch doesn't support DateTime64(6) type fields
- Support declared value for Nullable storage, avoiding separate bitmap performance impact
- multi thread write same batch data to clickhouse ReplicatedMergeTree, will data duplicate?
- Bitmap can only support Int. When can they be extended to UUID?
- view predicate pushdown doesn't work
- BloomFilter: use multiplication instead of modulo
- Replica recognizes that part is corrupted, deletes it, but does not fetch from another replica
- clickhouse don't graceful shutdown on systemctl stop clickhouse-server but no any errors in logs
- Put cursor at the beginning of the line before rendering prompt.
- Count from Set table
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- C++ not yet supported