descheduler: return the unmatched cases first

[googs1025]

Ⅰ. Describe what this PR does

We should return the unmatched cases first,and leave the filter method for last, because it is computationally expensive.

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.02%. Comparing base (583f723) to head (b814aeb).
Report is 63 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2435      +/-   ##
==========================================
- Coverage   66.04%   66.02%   -0.03%     
==========================================
  Files         470      470              
  Lines       55580    55580              
==========================================
- Hits        36709    36695      -14     
- Misses      16223    16235      +12     
- Partials     2648     2650       +2     

Flag	Coverage Δ
unittests	66.02% <100.00%> (-0.03%)	⬇️

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[saintube]

PTAL /cc @songtao98

[songtao98]

@googs1025 yes, I think this is a nice optimization in theory. However, have you already meet any performance bottleneck? It would be great if some real cases can be provided :)

/lgtm

[songtao98]

/approve

[googs1025]

@googs1025 yes, I think this is a nice optimization in theory. However, have you already meet any performance bottleneck? It would be great if some real cases can be provided :)

Not yet, I just noticed a fix from the code level 😄

[koordinator-bot]

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