clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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`
- `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
- Wrong results with `allow_nullable_key`: `ToStringMonotonicity` ignores `Nullable`, declaring `toString` monotonic over `Nullable(Enum)` / `Nullable(DateTime)` keys
- A zero-valued row leaves its index permanently in `zero_indexes`: `numericIndexedVectorPointwiseEqual(v, 0)` and the other scalar-0 comparisons silently report wrong results
- Window function over a multi-shard query whose table columns are referenced only in `WHERE`/`PREWHERE` silently returns no rows
- Keep an `IS NOT NULL` JOIN ON guard when the join key is `Variant` or `Dynamic`
- Validate a Map key subcolumn by its substream path in skip-index analysis
- Docs
- C++ not yet supported