clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Route long-lived MergeTree heap state to a dedicated jemalloc arena
- `QueryConditionCache` is poisoned by AST fuzzer queries — subsequent normal `WHERE` queries return zero rows
- Fix max_rows_to_transfer for GLOBAL IN/JOIN under the analyzer
- Per-CPU memory budget for max_untracked_memory to avoid OOMs
- BoundingBox and Centroid functions
- Cherry pick #102884 to 25.8: Optimization for deferring row policy and PREWHERE
- Cherry pick #102884 to 26.2: Optimization for deferring row policy and PREWHERE
- Arrow `time32`/`time64` types incorrectly pick up session timezone offset when inserted into `Time64` column
- `BackupWriterAzureBlobStorage::copyFile` writes destination outside `blob_path`, leaking blobs to container root
- `logQueryStart` early return when `query_log` is null silently disables `system.query_metric_log` collection
- Docs
- C++ not yet supported