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It makes prefetch amount of request each time drain loop does not emit any items

Seen in testing a solution for quarkusio/quarkus#50595

The groupBy operator was not correctly managing upstream requests.
It now makes prefetch amount of requests each time the drain loop
does not emit any items.

This commit includes both a reproducer and the fix for the issue.
@ozangunalp ozangunalp force-pushed the group_by_over_request branch from 2d7ad6e to 251d09f Compare November 11, 2025 10:06
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codecov bot commented Nov 11, 2025

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.08%. Comparing base (8c94ac3) to head (251d09f).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

Impacted file tree graph

@@             Coverage Diff              @@
##               main    #2003      +/-   ##
============================================
- Coverage     89.15%   89.08%   -0.07%     
+ Complexity     3070     3065       -5     
============================================
  Files           409      409              
  Lines         13100    13099       -1     
  Branches       1652     1652              
============================================
- Hits          11679    11669      -10     
- Misses          805      808       +3     
- Partials        616      622       +6     
Files with missing lines Coverage Δ
...mallrye/mutiny/operators/multi/MultiGroupByOp.java 86.14% <ø> (-0.06%) ⬇️

... and 12 files with indirect coverage changes

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