clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Row policy with DateTime64/Time64 query parameter re-parses to wrong value
- Parquet: read columns with the legacy null converted type 24
- A table created `AS postgresql(...)` or `AS mysql(...)` takes its connection pool settings from the context that loads it, so they change after a restart
- Async insert deduplication fails with `NOT_IMPLEMENTED` for materialized views whose output exceeds `min_insert_block_size_rows`, even if the view reduces rows
- Fix TOO_MANY_QUERY_PLAN_OPTIMIZATIONS when ORDER BY reads the argument of length, empty or notEmpty
- Add function hasTokenStartingWith with text index support
- Dictionary does not pick up ALTER NAMED COLLECTION until SYSTEM RELOAD DICTIONARY
- A query cannot leave a remote read that waits in the reader pool queue
- S3 requests of queries and merges retry up to ~41 min: the backup retry budget became the default for everyone
- Settings profile changes do not reach merges and other background work until a restart
- Docs
- C++ not yet supported