clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Column alias list after a table, CTE or table function is silently dropped
- Query condition cache for TopK reads of Parquet files in object storage
- IN subquery with coarser type than primary key prunes matching rows
- `IPv4` key drops `IN (SELECT <integer>)` matches: all-NULL cast read as miss
- `NOT IN`/`has` on `Bool` column with `toString` sorting key drops rows
- `castKeptEveryValue` throws `NOT_IMPLEMENTED` on a `FixedString` constant
- `QueryRunner` initiator ignores job query `SETTINGS` for wire type encoding
- Use iceberg row and column stats for Cascades CBO
- text index with ngrams tokenizer ignores (?i) in match(s, '(?i)(a|b)') and misses rows
- Iceberg OPTIMIZE fails with CANNOT_DECOMPRESS on gzip-compressed metadata
- Docs
- C++ not yet supported