E1 - Type of the free variable, i.e. the element the closure is called or closed on.R - Type of the closure's return value.public interface R2<E1,E2,R> extends IgniteReducer2<E1,E2,R>
alias for IgniteReducer2 by extending it. Since Java doesn't provide type aliases
(like Scala, for example) we resort to these types of measures. This is intended to provide for more
concise code in cases when readability won't be sacrificed. For more information see IgniteReducer2.GridFunc,
IgniteReducer2collectapply
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Ignite Database and Caching Platform : ver. 2.8.0 Release Date : February 27 2020