clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Stress test hung check: 100 threads serialized on SerializationObject callbacks_mutex held across a blocking marks-load wait, amplified by a 3-per-refill TEST log storm under ThreadFuzzer
- Not working ALTER TABLE .. MODIFY SETTING default_compression_codec
- AutoReleases: fail closed when the check-runs read keeps failing
- claude: add the artifact-readiness gate to the manual release-candidate recipe
- Fix indexHint with a truthy constant not fitting UInt8 dropping all data
- s3_plain_rewritable disk: a crash during DROP TABLE permanently leaks the whole dropped table's object-store subtree (RemoveRecursiveOperation commits metadata removal before its best-effort object deletion; boot never reclaims)
- Fix quadratic gzip/zlib streaming decompression of single-block streams
- Logical error "Bad cast from type DB::ColumnVector<int> to DB::ColumnTuple" in `fillMissingColumns` reading `size0` subcolumn after `CLEAR COLUMN` of a `Nested` `Tuple` element (stress, STID 3227-42db)
- BACKUP to S3: a crash after the .lock PUT permanently wedges the destination (BACKUP_ALREADY_EXISTS 'is being written already'), no in-server recovery
- LOGICAL_ERROR (Code 49) in a three-way join with a VIEW
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- C++ not yet supported