clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- 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
- Text index: function `has` with the index column on the right side
- Plan-based parallel replicas do not distribute a read inside a sealed view
- has-to-IN rewrite doesn't work with Nullable/LowCardinality right sides
- Evaluate `key = value` table function arguments on the initiator, not again on the servers a query is sent to
- Docs
- C++ not yet supported