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[DF] Avoid RVec construction+swap when possible
Rather than constructing a new RVec (as a view over the new array data) at every event and swapping with the old one, directly change the address of the old RVec.
This provides a ~10% performance improvement for a synthetic version of the dimuon tutorial adapted to only read (uncompressed) data.
Starting build on ROOT-debian10-i386/soversion, ROOT-performance-centos8-multicore/cxx17, ROOT-ubuntu18.04/nortcxxmod, ROOT-ubuntu2004/python3, mac1015/cxx17, mac11/cxx14, windows10/cxx14
How to customize builds
Build failed on ROOT-ubuntu2004/python3. Running on root-ubuntu-2004-1.cern.ch:/home/sftnight/build/workspace/root-pullrequests-build See console output.
Failing tests:
Build failed on ROOT-performance-centos8-multicore/cxx17. Running on olbdw-01.cern.ch:/data/sftnight/workspace/root-pullrequests-build See console output.
Failing tests:
Build failed on ROOT-ubuntu18.04/nortcxxmod. Running on sft-ubuntu-1804-3.cern.ch:/build/workspace/root-pullrequests-build See console output.
Failing tests:
Build failed on mac11/cxx14. Running on macphsft23.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build See console output.
Failing tests:
Build failed on mac1015/cxx17. Running on macitois21.dyndns.cern.ch:/Users/sftnight/build/workspace/root-pullrequests-build See console output.
Failing tests:
The jenkins logs are gone, but the test failure is due to certain RDF warnings being printed out that were not printed before. I'll have to investigate why (and whether the correct behavior is warning or no warning).
Will be superseded by bulk RDF making use of https://github.com/root-project/root/pull/12671 .