clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Add a regression test for the declared type of `identity` for `Variant`
- Fix deadlock on concurrent resolution of one Filesystem or HDFS table
- Parquet and ORC do not push predicates into Tuple subcolumns
- Monotonic function chains prevent ORC filter pushdown
- RFC: Cluster-Organized MergeTree for Billion-Scale Vector Search
- Skip swapping join sides with join_any_take_last_row
- Populate nested columns before creating `ColumnArray`
- Range condition in JOIN ON against a single-row side is not used for index analysis (no part pruning) since the logical join step became default
- Fix HDFS storage type parsing in data lake catalogs
- Divide wide integers limb by limb instead of bit by bit
- Docs
- C++ not yet supported