clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Keep an exact index atom for an injective key transform over a Tuple key
- Make test 05315_blob_storage_log_copy_event read system.remote_data_paths once
- Reject ALIAS columns that read themselves through a subcolumn
- Fix stale column comment in a backup of a lagging ReplicatedMergeTree replica
- Rebuild broken and missing commit-order projections from the part's data in a partial mutation
- Fix `NOT_FOUND_COLUMN_IN_BLOCK` with `optimize_inverse_dictionary_lookup` and a nested `dictGet` in a `GROUP BY` alias
- UNIQUE KEY: turn off the top-k and vector index passes
- Cancel mutation tasks that build or wait for a shared `IN` set
- Add a test for an `ALIAS` column that reads an `ALIAS` column declared after it
- Adaptive codec selection: sampling
- Docs
- C++ not yet supported