clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Build the PREWHERE plan once per read pool instead of once per part
- Fix CREATE TABLE on a KeeperMap path racing a concurrent drop
- Fix a mutated part losing files to the temporary directory cleanup
- Merge table over Distributed + JOIN + LIMIT n WITH TIES: the shard fragment keeps WITH TIES but drops ORDER BY, fails with WITH_TIES_WITHOUT_ORDER_BY
- Cap JSON String column buffer growth to reduce INSERT peak memory
- Shrink over-allocated columns on INSERT to reduce peak memory
- Fix server abort on empty BUFFERED_V1 WASM UDF result
- bloom_filter skip index on a String column prunes all granules for a FixedString constant with trailing zero padding (silent wrong result)
- Parallel replicas with `parallel_replicas_prefer_local_join = 0`: selecting an ALIAS column of the left table of a RIGHT/RIGHT SEMI/RIGHT ANTI join throws NO_SUCH_COLUMN_IN_TABLE
- Add batched key hashing to HashMethodHashed
- Docs
- C++ not yet supported