clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Docs: h3GetResolution incorrectly says invalid indexes return a random value
- Iceberg INSERT doesn't cut data files at `iceberg_insert_max_bytes_in_data_file` when Parquet encodes in parallel (regression from #127670)
- Fix loading a table whose `TTL ... WHERE` has an `IN` subquery after a table read behind the subquery is dropped
- Fix JSON functions for LowCardinality(Nullable) arguments
- Fix a failed web terminal query staying in `system.processes` until the next query of the session
- uniq*, min and max of a LowCardinality column without GROUP BY: add only the distinct dictionary values of each block
- ORDER BY <LowCardinality(String)> LIMIT n: enable the top-K dynamic filter by comparing dictionary values once per block
- Not for merge: link the ThinLTO release builds as non-PIE to measure the cost of PIE
- GROUP BY over a near-unique key with ORDER BY count() DESC LIMIT n: bound group counts before counting them in the adaptive merge (lone-count top-K -27%, ClickBench Q32 -14%)
- Re-exec the server child in the watchdog to refresh ASLR and stack canaries
- Docs
- C++ not yet supported