clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Reduce double-copy of data on Map functions
- Make error codes registry sparse
- SHOW USERS LIKE/NOT LIKE
- Perf: TPC-H regression after changing auto_statistics_types to uniq_v2
- Text index: pre-insert the postprocessor stop words into the token map
- Text index: Add a StringZilla-based tokenizer
- `lightweight_mutation_projection_mode = 'rebuild'` does not rebuild the projection; stale (deleted) rows returned via projection-based read-in-order
- keeper: Increase default `write_snapshot_version` to 8 and make it hot-reloadable
- Correlated subquery referencing an outer column via positional tuple element (o.p.1) fails NOT_FOUND_COLUMN_IN_BLOCK
- release_job: call create_release in-process instead of via subprocess
- Docs
- C++ not yet supported