Use HashMap.computeIfAbsent instead of get/put

[scwhittle]

Avoids hashing twice in the case it is inserting.

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[gemini-code-assist]

Summary of Changes

Hello @scwhittle, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request refactors a specific HashMap usage pattern within the WindmillSink class to leverage the computeIfAbsent() method. The primary goal is to enhance code readability and introduce a micro-optimization by preventing duplicate key hashing operations that would occur in the previous get() then put() logic when a new entry needed to be added to the map.

Highlights

• Code Optimization: Replaced a common HashMap get() and put() pattern with the more efficient computeIfAbsent() method in WindmillSink.java. This change avoids redundant key hashing when inserting new entries, leading to a minor performance improvement.

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[scwhittle]

R: @stankiewicz

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 40.38%. Comparing base (0f7a189) to head (51cc981).
⚠️ Report is 23 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master   #36990   +/-   ##
=========================================
  Coverage     40.38%   40.38%           
  Complexity     3470     3470           
=========================================
  Files          1226     1226           
  Lines        188337   188337           
  Branches       3603     3603           
=========================================
  Hits          76053    76053           
  Misses       108883   108883           
  Partials       3401     3401           

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