carloea2 opened a new pull request, #8226:
URL: https://github.com/apache/texera/pull/8226

   ### What is this PR for?
   
   Scan subqueues with a local index when peeking so observation does not 
advance the round-robin cursor or alter the next message returned by `get()`.
   
   Closes #8225
   
   ### What type of PR is it?
   
   Bug Fix
   
   ### How was this PR tested?
   
   ```text
   python -c "import sys,pytest; sys.path[:0]=[worktree amber source, main 
amber source]; raise 
SystemExit(pytest.main(['amber/src/test/python/core/util/customized_queue/test_linked_blocking_multi_queue.py','amber/src/test/python/core/models/test_internal_queue.py','-q','-p','no:cacheprovider']))"
   76 passed, 1 xfailed
   
   ruff check amber/src/main/python amber/src/test/python
   All checks passed
   
   ruff format --check amber/src/main/python amber/src/test/python
   213 files already formatted
   ```
   
   A direct post-fix probe confirmed that peek does not change the cursor or 
the next message:
   
   ```text
   cursor_before_peek=0
   peek=second
   cursor_after_peek=0
   next_after_peek=first
   ```
   
   Generated-by: Codex


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