clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Cannot rename column * because it's affected by mutation with ID * which is not finished yet
- Support function execution with a selection vector to improve short-circuit performance
- Deduplication within single writer scope
- Keeping dictionaries with lifetime=0 always in LOADED status
- Evaluate skip indexes for constant arrays
- Merges and fetches are stalled, even though the server has plenty of resources available
- Implement dynamic dispatch for StringSearcher
- Occurs error when (I)LIKE doesn't support search with-non-constant needles in constant haystack when left side is constant
- MATERIALIZE PROJECTION sometimes may require a lot of ram
- Refreshable materialized view fails with distributed tables/remote servers
- Docs
- C++ not yet supported