clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add test: `parseWKTMultiPolygon` and the `MULTIPOLYGON` WKT dispatch in `ArrowGeoTypes.cpp` have zero test coverage
- Fix UBSan in FieldVisitorConvertToNumber for wide-integer Float64 boundary
- Add tests for parseDateTime64BestEffort duplicate fractional separator (takeover of #102890 / supersede #103717)
- Add regexpPosition function (PostgreSQL regexp_instr compatibility)
- Fix null pointer dereference in lazy FINAL optimization (STID 1720-3759)
- LWU with parallel replicas SEGV
- More fuzzing in CI
- Route long-lived MergeTree heap state to a dedicated jemalloc arena
- `QueryConditionCache` is poisoned by AST fuzzer queries — subsequent normal `WHERE` queries return zero rows
- Add test: `StorageEmbeddedRocksDB::optimize` PARTITION/FINAL/DEDUPLICATE/CLEANUP rejection branches untested
- Docs
- C++ not yet supported