What is the AlwaysFilter and when it is used for?

What is the AlwaysFilter and when it is used for?
Could you explain it in the details.
Thank you

jetq wrote:
Sorry.
cache.aggregate(AlwaysFilter.INSTANCE, new LongMin("getAge"))
That doesn't really help.
Where does AlwaysFilter come from? Is it part of the core API, or a 3rd party library? If the latter, which one? And in what do the API docs for this class not answer your question?

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