clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- PostgreSQL database engine cannot correctly map pg numeric type after detachment (Code: 50. DB::Exception: Unknown data type family: Decimal(14, 2))
- 00409_shard_limit_by flakiness (likely something wrong with distributed queries processing)
- Apply `optimize_functions_to_subcolumns` to subcolumns
- ATTACH VIEW command fails on parameterised view
- Parameterized view with table identifier as a parameter not working
- MaterializedPostgreSQL connection breaks on column changes in postgres after restart
- Error MergeTreeBackgroundExecutor: Exception while executing background task {}: Code: 241. DB::Exception: Memory limit (total) exceeded: would use 3.60 GiB (attempt to allocate chunk of 4361024 bytes), maximum: 3.60 GiB. OvercommitTracker decision: Memory overcommit isn't used. Waiting time or overcommit denominator are set to zero. (MEMORY_LIMIT_EXCEEDED)
- count group by get an unexpect result
- [ClickHouse-66074] Implement SYSTEM LOAD PRIMARY KEY and related unit tests
- Utilizing a Shared Parsing Pool for Multiple Parquet Streams
- Docs
- C++ not yet supported