Han Fei

in tpc-h test, a query might have too many plans, like q2, there are 372 plans totally and always cost several hours to run.

Raw KV API Support

2

add raw kv api for client-c

Currently we only support get gc safe point from grpc api, but indeed, we should get safe point from etcd kv, and check if the safe point is out-date during...

This project should be packed as a shared lib with ffi interface so as to support other languages.

Currently, the MVCC Write is only used by test, some features is yet to add, like rollback asyncly after write fails. Maybe we'd better maintain serveral rollback queues rather than...

Introduce statistics of type "number of distinct values"

6

This PR introduces the "number of distinct values" (NDV) as statistics type. To add such statistics: ```sql ALTER TABLE tab ADD STATISTICS col1 TYPE Uniq; ``` Or to add NDV...

fix logical error in statistics estimation

2

fix https://github.com/ClickHouse/ClickHouse/issues/67742 This PR converts type and deal with type incompatible in estimator ### Changelog category (leave one): - Not for changelog (changelog entry is not required) ### Changelog entry...