clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix a `set` skip index dropping matching granules for a derived `indexHint` over an alias named like a column
- Part check ignore query cancellation
- Merge cross-side range predicates from WHERE into the JOIN condition
- Join reordering: without NDV, assume the smallest table joined on a key holds the unique key
- Let the adaptive aggregator thaw under the top-K pruning of `ORDER BY count() DESC LIMIT n`
- Do not infer join conditions through constant join keys in join reordering
- Measure Chromium trap-mode UBSan checks separately
- Size merge/mutation index granularity of JSON shared data by read size
- Do not read the client's stdin again after a read from it failed
- Build with `-fsanitize=return` in trap mode
- Docs
- C++ not yet supported