clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- getAggregatingProjectionInfo is slow
- Complex SQL queries may time out
- Incorrect behavior in indexOfAssumeSorted() for sorted array of low cardinality strings in MergeTree table engine
- No replica has part covering, and a merge is impossible: we didn't find a smaller part with the same min block
- [feature-request] - `formatSQLQuery` function and improve `clickhouse-format` to works with result of `normalizeQuery` result
- Vertical merges do not rewrite parts following the new index_granularity when restoring from a backup
- Could ClickHouse consider short-circuiting COALESCE()
- [Umbrella] Lightweight Updates improvements
- `00563_shard_insert_into_remote` is flaky
- Unable to start clickhouse server with missing backup
- Docs
- C++ not yet supported