clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `INSERT ... RETURNING` on a deduplicated retry returns generated values that are never stored
- `INSERT ... RETURNING` returns rows that are never written, including rows rejected by a `CHECK` constraint
- Push PromQL label matchers into the "one" side of binary operators
- Apply the conditions of WHERE as PREWHERE to the non-intersecting ranges of FINAL
- Use up to `max_threads` threads for the lazy materialization read when the main `MergeTree` read runs in several threads
- `DataLakeCatalog` can't read tables stored on HDFS: `Unsupported storage type: hdfs://`
- Poll the stop flag inside the file reads of a part check
- Reject a key computed from an aggregated column in `AggregatingMergeTree`
- GraphiteMergeTree FINAL prunes a rollup bucket via indexHint time bound
- Queries on S3 cache unecessarily enqueues part check on TIMEOUT_EXCEEDED exception
- Docs
- C++ not yet supported