Fixes a bug where the compensated sum should be negated when added together in the merge step of a given collector. This impacts accuracy of parallel summations with Double streams and creates larger deviations from a standard sequential (ie non-parallel) compensated summation.
------------- Commit messages: - Fixing a compensated/Kahan summation bug that increase error Changes: https://git.openjdk.java.net/jdk/pull/3442/files Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3442&range=00 Issue: https://bugs.openjdk.java.net/browse/JDK-8214761 Stats: 16 lines in 3 files changed: 10 ins; 0 del; 6 mod Patch: https://git.openjdk.java.net/jdk/pull/3442.diff Fetch: git fetch https://git.openjdk.java.net/jdk pull/3442/head:pull/3442 PR: https://git.openjdk.java.net/jdk/pull/3442
