clickhouse
https://github.com/clickhouse/clickhouse
C++
ClickHouse is a free analytics DBMS for big data
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- Issues
- Iceberg writes: timestamp (without time zone) columns are written to Parquet with isAdjustedToUTC=true, making the files unreadable in Snowflake
- Partial join push-down drops `indexHint` inside OR, losing index pruning
- Run the ASan+UBSan unit tests and flaky check on ARM runners
- Table shared with a nested `UNION ALL` view: `Duplicate announcement`
- Subquery or view that disables parallel replicas is read once per replica
- Nested view FINAL/opt-out ignored, causing rows counted per replica
- Drop the inner tables of a `TimeSeries` table whose `CREATE` fails
- Typed `IN (SELECT ...)` narrowing casts set to `String`, drops tables like `01`
- System-table narrowing reads a `break`-truncated set's incomplete elements
- `tuple(x) IN` decoded as `x IN` by `analyzeSet`: rows dropped, wrong shards
- Docs
- C++ not yet supported