clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `ARRAY JOIN` with a view boundary between fail with `TYPE_MISMATCH`
- A filter above `LIMIT` / `LIMIT BY` on a join's build side poisons the query condition cache under the key of the `WHERE` below it
- Document macro expansion in Kafka engine settings
- Child re-analysis rewrites `count(x)` the `Merge` did not: `CANNOT_CONVERT_TYPE`
- Inferred Avro union Variant unreadable with enable_nullable_tuple_type = 0
- SYSTEM DROP DATABASE REPLICA ... FROM ZKPATH formatter drops WITH TABLES
- Use `ifNull(y, c)` and `coalesce(y, c)` keys for comparisons, patterns and `IS NULL` on `y`
- `GROUPING SETS` constant key dropped: empty-input `()` row lost or doubled
- S3Queue: runtime settings of tables sharing a `keeper_path` are shared and not validated
- optimize_on_insert merge of Replacing/Collapsing/VersionedCollapsing MergeTree copies every column row by row
- Docs
- C++ not yet supported