Don't need to copy the obj from stats cache each time if we set `force-init-stats` to true
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component/statistics
sig/planner
type/enhancement
- Dominant language
- Go
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Description
## Enhancement
If we set `force-init-stats` to true, the stats initialization is a blocker of TiDB's bootstrap. So we don't need to worry about the concurrent read&write of the stats cache.
We can avoid the usage of Copy.
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