T- the type of the items to count
F- the type of the optional filter in the query,
Voidif filtering is not supported
@FunctionalInterface public static interface CallbackDataProvider.CountCallback<T,F> extends Serializable
Query.getFilter(). The query also contains information about paging and sorting although that information is generally not applicable for determining the number of items.
query- the query that defines which items to count
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