clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Fix Iceberg data file size limit when Parquet encodes in parallel
- Functions on LowCardinality columns run on the whole dictionary even when the block has only a few rows
- Optimize Decimal256 text parsing with machine-word chunks
- Batch `LowCardinality` columns in merges with `merge_use_batch_sorting_queue`
- Squash view output into one block for async inserts with view deduplication
- Build with `-ftrivial-auto-var-init=zero`
- PIE: measure the runtime cost of the PIE release binaries on amd64 and aarch64
- Measure compressed blocks read for AutoPR input bytes instead of sampling
- `KeeperMap` backup dedup keyed by path only: aux-Keeper table data lost
- `min_marks_to_honor_max_concurrent_queries` counts marks a skip index drops
- Docs
- C++ not yet supported