clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Schema inference: an integer past the inference sample is silently wrapped into the sampled type — ClickHouse cannot read back its own CSV export of a UInt64 column
- serializeSortDescription writes `alias` only for WITH FILL columns
- optimize_redundant_functions_in_order_by drops an ORDER BY term under WITH CUBE / ROLLUP / GROUPING SETS, returning wrong row order — and wrong rows under LIMIT
- Empty namespace tuple from a REST catalog throws LOGICAL_ERROR in `parseNamespaces`
- 04838 sync polls a queue count the INSERT already satisfies: flaky RENAME race
- mergeTreeIndex structure resolution has no access check: DESCRIBE leaks the schema
- `supported` array parsers accept only double quotes: `undefined` in /docs badge
- `IAST::intrusive_ptr_release` calls `dynamic_cast<void *>` on an already-destroyed object — latent UB, interior-pointer free under `operator delete` on any AST class whose `IAST` base is not at offset 0
- Fix `IAST::intrusive_ptr_release` UB from `dynamic_cast` on an already-destroyed object
- Add the spilling mode of the partitioned hash join
- Docs
- C++ not yet supported