clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Avoid per-state heap allocation in UniquesHashSet::read and batch merge
- Speed up ColumnObject hashing of shared-data values (JSON columns)
- Mask credentials in system.distributed_ddl_queue query column
- Preserve unchanged TOAST values in MaterializedPostgreSQL
- Flaky test `04541_create_as_select_table_scoped_insert_grant`: denied `CREATE TABLE ... AS SELECT` intermittently succeeds without `ACCESS_DENIED` (DatabaseReplicated)
- ReaderExecutor: run S3 fetch steps on Silk fibers (prototype)
- Correlated scalar subquery with count()/uniqExact() returns NULL instead of 0 for empty groups
- Parse the HTTP Last-Modified header without `strptime`
- ARRAY JOIN / array string-filter executor regressions: Nested +25% in 25.9, all shapes +30–75% in 26.1, Nested ×2 in 26.6
- Text index: add trivial count optimization
- Docs
- C++ not yet supported