T- The type of input object that this query accepts
public interface IQuery<T>
IQueryable. A query is a piece of logic that selects some objects from a list of provided inputs using some established criteria.
Any given query must be stable - running the same query on the same inputs must return an equal query result each time the query is executed. Thus a client that has performed a query can freely cache the result as long as they know the query input has not changed.
IQueryResult<T> perform(Iterator<T> iterator)
iterator- The elements for which to evaluate the query on
nullif this is not an expression query.
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