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What does the OCP 11 topics guide mean by "decomposition of a stream"?

 
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One of the topics in the OCP 11 is parallel streams:

Parallel streams
   • Develop the code that use parallel stream
   • Implement decomposition and reduction with stream


What is decomposition in the context of parallel streams? I have tried to find out, but have not come up with anything. Is is talking about decomposing data with Spliterator?
 
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