perf: Optimize only a single cache input

[ritchie46]

This removes quadratic behavior in CSE.

#21637

[github-actions]

The uncompressed lib size after this PR is 42.0596 MB.

[codecov]

Codecov Report

Attention: Patch coverage is 98.27586% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.54%. Comparing base (ae519ea) to head (3a779df).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/polars-plan/src/plans/optimizer/cache_states.rs	98.21%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #21644      +/-   ##
==========================================
- Coverage   80.56%   80.54%   -0.03%     
==========================================
  Files        1603     1603              
  Lines      231654   231266     -388     
  Branches     2650     2650              
==========================================
- Hits       186631   186263     -368     
+ Misses      44406    44386      -20     
  Partials      617      617              

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[mcrumiller]

Hi @ritchie46, this didn't actually close the referenced issue.

[ritchie46]

Hi @ritchie46, this didn't actually close the referenced issue.

Intentional. This one does: #21646 😉