Spring Re-ordering Stream APIs - Nineya|java/go/python

We are conducting a research project on re-ordering Stream APIs for improving program execution speed.

Before and after re-ordering, we measured running time of tests which execute target Stream. Command for running tests is : time ./gradlew -Dtest.single=RestTemplateTests test

and the result is :

the order of Stream API      test running time
===============================================
distinct().sorted()                 50.165s
sorted().distinct()                 47.752s

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Comment From: rstoyanchev

This time however includes compiling and running tests from other modules dependent on spring-web. Running from inside the IDE for example I get a very small difference in the execution for the tests with and without the change. Further, to really prove it is better, the JVM would need to warm up, e.g. using jmh.