clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- deltaLakeAzure: route through DeltaKernel so time travel, CDF, and schema evolution work
- `HasSystemTablesMatcher` misses system tables in `remote`, `cluster`, `remoteSecure` with quoted names
- `ALTER USER` no-op detection bypassed by `ON CLUSTER` and `IN storage_name` clauses
- `s3()` fails to read parquet files embedded in zip when file exceeds a certain threshold
- Lazy-load column statistics during query planning
- vector_similarity default quantization (bf16) silently collapses vectors at magnitudes >>1, returns wrong nearest neighbours
- Flag `max_replicated_table_num_to_warn`
- Flaky test: 03710_parallel_alter_comment_rename_selects
- <lifetime> does not reload executable_pool UDFs when the underlying script changes
- Proposal: Integrate Blosc2, ZFP, and ZipNN as native compression codecs for numerical arrays
- Docs
- C++ not yet supported