fix: Fix struct name resolving

[ritchie46]

fixes #15430

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 34 lines in your changes are missing coverage. Please review.

Project coverage is 81.14%. Comparing base (e3c2b0d) to head (f8b82bc).
Report is 15 commits behind head on main.

❗ Current head f8b82bc differs from pull request most recent head 67f8acd. Consider uploading reports for the commit 67f8acd to get more accurate results

Files	Patch %	Lines
crates/polars-plan/src/logical_plan/projection.rs	50.90%	27 Missing ⚠️
crates/polars-arrow/src/legacy/index.rs	0.00%	7 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##             main   #15507    +/-   ##
========================================
  Coverage   81.13%   81.14%            
========================================
  Files        1362     1362            
  Lines      174820   174979   +159     
  Branches     2531     2531            
========================================
+ Hits       141836   141980   +144     
- Misses      32500    32516    +16     
+ Partials      484      483     -1     

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