clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- Revert "Revert "[GPU] `GDeflate` compression codec on the CPU""
- Check SHOW COLUMNS before EXPLAIN SYNTAX inlines a parameterized view definition
- Check the query of `CREATE HANDLER` against its creator and support `DEFINER` / `SQL SECURITY` for handlers
- Fix `INSERT SELECT` from table functions when a `DEFAULT` reads a column the `INSERT` does not write
- Plan-based parallel replicas: do not ship a read of a temporary table
- Apply filesystem_prefetches_limit and filesystem_prefetch_max_memory_usage to merges and mutations
- Read Paimon primary-key tables where Paimon itself reads them without merging
- Surface version metadata ("introduced in", "deprecated in") on documentation pages
- Backport #127867 to 26.10: Fix `LOGICAL_ERROR` reading `SHARED` paths of dynamic types of a `JSON` column with the columns cache
- Add `JSONExtractLeafValues` and `JSONExtractLeafPathsAndValues` to read all leaf values of a JSON `String`
- Docs
- C++ not yet supported