clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Backport #119523 to 26.3: Check the read source grant and the host filter when a `HDFS` database serves a table from its cache
- Backport #119523 to 26.7: Check the read source grant and the host filter when a `HDFS` database serves a table from its cache
- Iceberg compaction after a DELETE on a schema-evolved table rewrites the metadata as `v0` and makes the table permanently unreadable
- Take the serialization of a column from the data part in the MergeTree readers
- DeltaLake writes: INSERT into a `timestamp_ntz` column writes a UTC-adjusted Parquet timestamp, Spark cannot read the table
- 01660_system_parts_smoke fails with Bad get: has `Int128`, requested `UInt128`
- Text index: every query re-resolves each index substream by stat-ing the filesystem once per part, although the part already holds the name and size in its checksums; count() with one hasToken needle over 400 parts drops 41 ms to 27 ms
- A `SETTINGS` name that is not a setting at all is silently accepted and stored by `File`, `URL`, `S3` and the `Log` family
- Add test: `Multiple` codec: 3 corrupt-block validation branches have zero coverage
- Async INSERT into DeltaLake with wait_for_async_insert=0 is acknowledged when allow_delta_lake_writes=0, rows silently dropped at flush
- Docs
- C++ not yet supported