clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- PromQL: accept a phi that is not constant in histogram_quantile
- `DROP INDEX` deletes column marks in pairs the new check admits as legal
- Stop reading early for `ORDER BY` a sorting key prefix with `LIMIT` from 1500 to `max_block_size`
- Parquet: a warm server opens every file of a glob only to prune all its row groups by statistics; keeping those statistics with the cached footer skips such files (ClickBench Q43 −71%, Q41 −39% over 100 files)
- Escape backslashes in PromQL expressions of the promqltest harness
- Iceberg: selecting a struct field fails with NOT_FOUND_COLUMN_IN_BLOCK after ADD COLUMN
- Fix `Upgrade check` errors from the empty part left by `DETACH PART` in `04653`
- ORDER BY on MergeTree sort-key prefix scans entire table for smaller LIMIT
- Every query on an Iceberg format-version 3 table logs a spurious "violates Iceberg specification" warning
- Fix unreadable parts of `SimpleAggregateFunction` over `AggregateFunction(0, ...)` after a reload
- Docs
- C++ not yet supported