Read edm4hep

[andresailer]

BEGINRELEASENOTES

• DDSim: add a reader for EDM4hep files, fixes Create EDM4hep reader for DDG4 #1369
  • DDSim can now read EDM4hep files in root format.

ENDRELEASENOTES

• Actually ingest parameters
  • [x] Also ingest GeneratorInfo (to be done later Add GeneratorInfo to EDM4hepReader #1373)
• Test with complicated events

[github-actions]

Test Results

   14 files     14 suites   5h 37m 26s ⏱️
  370 tests   369 ✅ 0 💤 1 ❌
2 539 runs  2 538 ✅ 0 💤 1 ❌

For more details on these failures, see this check.

Results for commit 60603ac.

♻️ This comment has been updated with latest results.

[andresailer]

That GeneratorInfo is not yet written to EDM4hep files?

[tmadlener]

That GeneratorInfo is not yet written to EDM4hep files?

Not consistently, i.e. if at all currently only with files that are produced via k4GeneratorsConfig. So I think we have to consider that effectively optional at this point, until that has become more prevalent. Additionally, there are still some changes pending, so maybe we should consider postponing that here in any case?

[tmadlener]

Suggested change

	podio::ROOTReader m_reader {};
	podio::Reader m_reader;

Would immediately enable support for more backends (most importantly RNTuple, to a lesser extent SIO), without having to do that later.

[andresailer]

What is the file extension convention for sio files?

[tmadlener]

"sio" (as per this check)

[tmadlener]

This will inadvertently mix "file level" metadata and run parameters for the output, right?

[andresailer]

Indeed it would do that.

[tmadlener]

Is there a way to keep them separated? E.g. by attaching the metadata frame to some entity as an extension and then writing it out again as a whole in the output if it is present?