clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `optimize_trivial_count_with_sparsity_filter` counts default values as NULL after a metadata-only MODIFY COLUMN to Nullable: `count() WHERE v IS NULL` returns the number of zeros
- `toString` claims injectivity for every type: DST fold splits one GROUP BY key
- CBO underestimates multi-key GROUP BY cardinality using max single-column NDV
- UInt64 curve guard ignores Nullable: `Nullable(UInt64)` args still prune rows
- OPTIMIZE TABLE deletes metadata/version-hint.text, leaving the table unreadable
- OPTIMIZE TABLE roots compaction at the metadata pointer: newer snapshots lost
- SYSTEM WAIT VIEW returns Ok. while a requested refresh is still pending on another replica
- Fix `AsynchronousInsertQueueSize` and `AsynchronousInsertQueueBytes` drift
- Stream row_number with its default frame
- Support per-column compression codecs in projections
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