clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
Triage Issues!
When you volunteer to triage issues, you'll receive an email each day with a link to an open issue that needs help in this project. You'll also receive instructions on how to triage issues.
Triage Docs!
Receive a documented method or class from your favorite GitHub repos in your inbox every day. If you're really pro, receive undocumented methods or classes and supercharge your commit history.
C++ not yet supported67 Subscribers
Add a CodeTriage badge to clickhouse
Help out
- Issues
- Zero-length `columns_substreams.txt` after power loss detaches the whole Wide part and silently loses acknowledged rows (missing file is safe, empty file is fatal)
- Zero-length or missing `ttl.txt` after power loss detaches the whole part and silently loses acknowledged rows, although TTL infos are recomputable derived data
- A function throws for a row whose result is NULL, when the payload under the null map is a value it rejects (`match` with an invalid regular expression, `hasToken` with a separator)
- Skip index over a Map column `j.m` wrongly prunes granules when the predicate reads a JSON dynamic path `j.m.key_<k>` of a sibling JSON column `j`
- GLOBAL RIGHT JOIN swap moves PREWHERE'd left table into a Memory temp table
- `tupleElement` default argument referencing an `ARRAY JOIN`-ed `Nested` subcolumn: `PruneArrayJoinColumnsPass` prunes it, causing silent wrong results or `BAD_ARGUMENTS`
- Write columns of target table in SELECT INSERT queries to query_log
- Revision is not unique between Clickhouse releases
- Two skip indexes + an OR with a constant disjunct + a function-wrapped comparison (`toString(e) < 'c' AND (0 OR id != 5)`) return no rows: the combined skip-index AND/OR processing prunes every granule (`use_skip_indexes_for_disjunctions`)
- Wrong results with `allow_nullable_key`: `ToStringMonotonicity` ignores `Nullable`, declaring `toString` monotonic over `Nullable(Enum)` / `Nullable(DateTime)` keys
- Docs
- C++ not yet supported