clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Query condition cache serves another session's verdict when a conversion captures a session setting (precise_float_parsing) not in the cache key: rows silently vanish
- Treat a bare table identifier on the right of `IN` as a deferred set for mutation pruning
- Do not rewrite a comparison chain into `IN` across `String` and `FixedString`
- Coerce the constant in the remaining two `bloom_filter` index paths
- Support PromQL over a Distributed table of TimeSeries shards
- AST fuzzer oracle suite (1/4): framework + core correctness oracles
- Reject a `RENAME DATABASE` that would make an `Alias` table cyclic
- JOIN runtime filters index analysis : prune the left side by several key ranges instead of one [min, max]
- Stop claiming injectivity for `toString` of a folding date-time and `toFixedString` of a `String`
- Fix lightweight update pruning of empty partitions
- Docs
- C++ not yet supported