Room : LiveData from Dao will trigger Observer.onChanged on every Update, even if the LiveData value has no change

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There is simple solution in Transformations method distinctUntilChanged.expose new data only if data was changed.

In this case we get data only when it changes in source:

LiveData<YourType> getData(){
    return Transformations.distinctUntilChanged(LiveData<YourType> source));
}

But for Event cases is better to use this:
https://stackoverflow.com/a/55212795/9381524

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