clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- `Merge` over data lake child throws `LOGICAL_ERROR` after column type widening
- Fix `AMBIGUOUS_COLUMN_NAME` when a `PREWHERE` split into steps computes two different columns with one name
- fix(promql): Inherit TimeSeries row policies in the inner tags table.
- Fix `LOGICAL_ERROR` for row policies and `PREWHERE` on `Merge` and materialized views over a data lake table whose column type changed
- Use a pool of Hive Metastore connections in `HiveCatalog`
- Add AI FUNCTIONS privilege group
- Add the ABR table engine, a read-only proxy over MergeTree tables for large analytics datasets
- Replicated database: a new replica can't replay a table whose dynamic S3 disk uses role_arn, and DDL in the whole database stalls
- Remove duplicates inside `SortingStep` for `SELECT DISTINCT ... ORDER BY ... LIMIT N`
- Store the shared variant discriminator in `ColumnDynamic::VariantInfo` to speed up merges of `JSON` columns
- Docs
- C++ not yet supported