clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Parquet filter push‑down: no pruning when Float32 column is compared to Float64
- Reading empty CSV results in a NOT_FOUND_COLUMN_IN_BLOCK
- Aggregate function for filtering top k values for each index in arrays
- Chunk's/Pipeline lazy materialization of filter/sort/bucketing transforms
- Metrics for Broken Disk and Logs when Disk Checker Enabled
- An empty table INTERSECT with a large table consumes an unbounded amount of memory while it can be optimized.
- `JSONCompactEachRow` input format should recognize the case when the data is wrapped into a single array
- EXPLAIN SYNTAX should return a single multi-line record instead of many single-line records
- Sometimes ALTER cannot find a column in the table
- Duplicates with all right join and join engine. Parallel replicas
- Docs
- C++ not yet supported