clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Arrow stream format can not write arrow list
- Add "user" label to query metrics in Prometheus
- Metadata on replica is not up to date with common metadata in Zookeeper
- Pattern match on Array values using skip index
- Relax check when attaching part with nullable column
- Parameterised queries only work with `SELECT` queries
- Add ProfileEvents to count the number of granules and rows dropped by PREWHERE and the total number of granules and rows read when PREWHERE was possible.
- Confusing exception message if you repeate columns in drop column
- SQLite FTS5 support
- Allow to specify default compression codec in MergeTree SETTINGS.
- Docs
- C++ not yet supported