Non-transactional DML should not use the default scan concurrency
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good first issue
type/enhancement
- Dominant language
- Go
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Description
## Enhancement
According to
https://github.com/pingcap/tidb/blob/fd7c13a9340470233bf0c52c60eb8c04095d394c/pkg/distsql/request_builder.go#L94, when max_distsql_concurrency is the default setting, the first SELECT in non-transactional DML may only use max_distsql_concurrency=2, which affects its performance.
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