clickhouse
https://github.com/yandex/clickhouse
C++
ClickHouse is a free analytic DBMS for big data.
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- Issues
- EXPLAIN PLAN tree = 1: draw the nested plans of a step
- Make `SYSTEM SYNC REPLICA` and `OPTIMIZE` of `ReplicatedMergeTree` cancellable while they wait for the replication queue
- Reject `ALTER MODIFY COLUMN` that changes the values of a key subcolumn without changing its type
- [GPU] Use JIT to compile expressions into NVPTX
- Keep LDAP mapped roles on a login without a password
- Join reordering without row estimates builds the 600M-row `lineitem`: TPC-H Q5 on Iceberg with `grace_hash` is 3.5-4x slower since DPsub became the default
- Fix flaky test `02346_text_index_optimize_trivial_count`
- Growing a large PODArray is 1.4–2× slower and needs ~1.5× more memory since mmap/mremap left Allocator (#52792)
- A table created `AS` a table function whose explicit structure has other column names cannot be read
- Read the CI DB read URL from SSM instead of hardcoding play.clickhouse.com
- Docs
- C++ not yet supported