clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- [CI crash] MergeTreeReaderCompact readData failed during data deserialization
- Cherry pick #106692 to 25.8: Fix segfault due to use-after-free in NATS
- Fix race between quorum failure cleanup and GET_PART queue entries.
- Flaky test `test_iceberg_snapshot_reads`: stale count after Spark append, and batch `create_iceberg_table` failures
- Parquet: dictionary-based row group filtering
- [Experiment] Reduce size of hashtable by demoting some of keys from hash to post filter step
- Silent data loss: bare Array(T) in AggregatingMergeTree keeps one row's value during merge
- Inserts to MVs are dropped - Happens on chained Mvs down the chain.
- Clickhouse V.26.3.9.8 Can't Create Table Egine while V.26.5 Can
- `DESCRIBE` and `SHOW CREATE TABLE` report stale column types for TO-target materialized views after upstream `ALTER MODIFY COLUMN`
- Docs
- C++ not yet supported