Also make joins between two index scans individually observable.

[joka921]

No description provided.

[sparql-conformance]

Conformance check passed ✅

No test result changes.

Details: https://qlever.cs.uni-freiburg.de/sparql-conformance-ui?cur=8a362a0359dc09a7a9be1748f37b8cdc42b365fd&prev=ec806f0091babfdcb57b20189c7656337b3f7a71

[codecov]

Codecov Report

Attention: Patch coverage is 75.28090% with 22 lines in your changes missing coverage. Please review.

Project coverage is 89.53%. Comparing base (ec806f0) to head (8a362a0).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
src/engine/IndexScan.cpp	73.33%	11 Missing and 5 partials ⚠️
src/engine/Join.cpp	64.70%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1666      +/-   ##
==========================================
- Coverage   89.58%   89.53%   -0.06%     
==========================================
  Files         381      381              
  Lines       36813    36864      +51     
  Branches     4173     4184      +11     
==========================================
+ Hits        32978    33005      +27     
- Misses       2523     2541      +18     
- Partials     1312     1318       +6     

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[sonarcloud]

Quality Gate passed

Issues
13 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud