clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `openCgroupv2MetricFile` builds invalid file paths via string concat without separator, silently disabling all `CGroup*` metrics for nested cgroups (e.g. systemd setups)
- Backport #103014 to 26.3: Fix `MULTIPLE_EXPRESSIONS_FOR_ALIAS` in `FuseFunctionsPass` for repeated `quantile` on distributed queries
- Remove and forbid build-time CMake checks
- Add test: `input_format_hive_text_allow_variable_number_of_columns=0` (strict mode) and the extra-columns branch are untested for HIVETEXT
- Backport #103834 to 26.2: Reliable key receiving from a chain of keyservers
- Iceberg: do not flag expired originating snapshot_id as spec violation
- Fix SQL injection in ExternalQueryBuilder via incorrect string escaping
- Add test: `ToShortest` fallback in `formatReadable` is reachable but untested across the suite
- Add test: Precedence of `--output-format`/`--format` over `--vertical` in `setDefaultFormatsAndCompressionFromConfiguration` is untested
- Add test: ORC writer BINARY-type schema path (`output_format_orc_string_as_string=0`) untested after default flip to 1
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- C++ not yet supported