clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Record the granules excluded by skip indexes at data read time in the query condition cache
- TTL merge recomputes `MATERIALIZED` on all rows: `SummingMergeTree` sums change
- `UPDATE`-applied column TTL leaves `MATERIALIZED` dependents stale on Wide parts
- Table name in `joinGet` is not qualified with the database of the updated table in mutations
- `PRIMARY KEY`/`DEFAULT` JSON checks are type-only: aliased or `a.b` nodes pass
- Skip index expression whose name matches a stored column overwrites that column on INSERT
- hasPhrase with Array(String) phrase drops rows on JSON text index
- Vector index ignores `exact_rows_before_limit`: count 4, not 64 (pre-existing)
- Vector search with `additional_table_filters` throws `Not found result vec`
- Iceberg `DROP PARTITION {p:T}` rejected: `_CAST` form unhandled (pre-existing)
- Docs
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