clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Text index: negated predicates (NOT LIKE, NOT hasToken, !=) scan the whole column; direct read could serve them
- Report a crashed server as `Server died` in functional tests
- Enable the columns cache by default
- perf(insert): Add MergeTree setting apply_ttl_delete_on_insert.
- Fix `NOT_FOUND_COLUMN_IN_BLOCK` when a logical-expression alias is reused by `GROUP BY` and other clauses
- Query condition cache serves stale entries across a metadata-only `MODIFY COLUMN ... DEFAULT`: matching rows silently dropped
- Mutation determinism guard treats niladic `now`/`CURRENT_DATE` as a column
- Fix empty arrays for a Nested member that a Merge child table does not have
- Add the `ResetSession` packet to the native protocol
- Reject skip indexes whose ALIAS columns a lambda parameter would capture
- Docs
- C++ not yet supported