clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Preserve SettingFieldMaxThreads::is_auto across SET <name> = DEFAULT
- `canConvertTo<size_t>` returns true for `x = 2^64` because `Float64(SIZE_MAX)` rounds up to `2^64`; subsequent `static_cast<size_t>` is UB
- Add test: `input_format_force_null_for_omitted_fields` throw branch in `JSONColumnsBlockInputFormatBase` untested for `JSONColumns` / `JSONCompactColumns` / `JSONColumnsWithMetadata`
- Add test: `arrayDotProduct` const/non-const path size-mismatch branch untested
- Add test: Laziness of default argument in 5-arg `dictGetOrDefault` for `RANGE_HASHED` dictionary is untested
- Add test: Positive overflow branch of `max_streams_to_max_threads_ratio` check untested (existing test only covers negative)
- Add test: `merge() AS alias` with alias-qualified `_table`/`_database` virtual columns has zero coverage
- Add test: Stub ATTACH on missing database without `ON CLUSTER` — explicit `UNKNOWN_DATABASE` throw untested
- Add test: `ALTER ... MODIFY SQL SECURITY INVOKER` definer-clearing in `SHOW CREATE TABLE` and standalone `MODIFY DEFINER` syntax untested end-to-end
- Add test: `windowID` time-overflow guard in `executeHopSlice` is untested
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