clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `KeyCondition` ignores `cast_string_to_date_time_mode`: ISO `Z` literal rejected
- CBO underestimates join and partial aggregation costs when runtime filtering skews reader output
- Match `modulo` predicates against `moduloLegacy` keys only where the two agree
- trino dialect: fix array_except, flatten and reverse to match Trino semantics
- changes() predicate is bit identity, not IEEE equality plus a NaN guard
- mapAdd/mapSubtract throw BAD_GET on Decimal32/Decimal64 values
- Backward code-point count budgets a forward walk: rightUTF8 drops trailing bytes
- `NOT_FOUND_COLUMN_IN_BLOCK` for a materialized CTE inside an `IN` subquery with parallel replicas when `parallel_replicas_local_plan = 0`
- [RFC] Unified `bloom_filter` skip index with a tokenizer and automatic sizing
- Fix(Access): HOST LIKE parsing for short IPv6 hextets
- Docs
- C++ not yet supported