how to improve the parallelism of queries

[qicaiyulin]

When a cluster has multiple query nodes, whether the sql query task of a query node can be executed concurrently on multiple query nodes?

[BohuTANG]

Yes.
Currently, SELECT and INSERT in Databend are distributed among cluster nodes. Others we are still improving, such as the COPY command.

The main code is in:
https://github.com/datafuselabs/databend/blob/d6b86315015f052ceba3741b57391e6dbf87e7fb/src/query/service/src/optimizers/optimizer_scatters.rs