rows.go的ReflectNew当大数据量时，并发多个请求出现out of range错误

[jacoblai]

func ReflectNew(typ reflect.Type) reflect.Value {
	reflectCacheMutex.RLock()
	cs, ok := reflectCache[typ]
	reflectCacheMutex.RUnlock()

	const newSize = 200

	if !ok || cs.idx+1 > newSize-1 {
		cs = &cacheStruct{reflect.MakeSlice(reflect.SliceOf(typ), newSize, newSize), 0}
		reflectCacheMutex.Lock()
		reflectCache[typ] = cs
		reflectCacheMutex.Unlock()
	} else {
		reflectCacheMutex.Lock()
		cs.idx = cs.idx + 1
		reflectCacheMutex.Unlock()
	}
	//todo 当大数据量时，并发多个请求出现out of range错误
	return cs.value.Index(cs.idx).Addr()
}

[lunny]

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