clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- An empty table EXCEPT with a large table consumes an unbounded amount of memory while it can be optimized
- Values of SimpleAgregateFunction(F, T) can be aggregated not only with corresponding aggregate function F
- Race between merge and `ALTER RENAME COLUMN` may lead to data loss of renamed column
- Support CREATE OR REPLACE for named collection
- TTLDeleteMerge stopped MEMORY_LIMIT_EXCEEDED
- MergeTree support using TTL to move data to S3 archive storage
- Enable usage of the query condition cache for `SELECT FINAL` queries
- Wrong column name returned using `shardNum` and `RemoteQueryExecutor`
- `Unknown expression identifier` could have been omitted because of the identifier resolution cache.
- Add grant for execute function
- Docs
- C++ not yet supported