Limit concurrency in planner to runtime.GOMAXPROCS(0) #168
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Previously planner would create an unbounded number of goroutines.
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Before this change: planner creates a new goroutine for each row, possibly causing resource exhaustion if there are too many rows.
After this change: planner will only create up to runtime.GOMAXPROCS(0) goroutines, limiting resource usage.
This change is based on the suggested implementation from golang/go#27837.