fix(python): fix panic when doing a scan_parquet with hive partioning

[kszlim]

Seems to fix (the first bug reported in) #15375 for me, not sure if this is valid though? @ritchie46

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.38%. Comparing base (a871359) to head (559258e).
Report is 3 commits behind head on main.

❗ Current head 559258e differs from pull request most recent head fd7558f. Consider uploading reports for the commit fd7558f to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #15381   +/-   ##
=======================================
  Coverage   81.38%   81.38%           
=======================================
  Files        1361     1361           
  Lines      176489   176497    +8     
  Branches     2531     2531           
=======================================
+ Hits       143637   143644    +7     
- Misses      32366    32369    +3     
+ Partials      486      484    -2     

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[ritchie46]

I got a repro, will add a test.

[ritchie46]

Thank you @kszlim. To go forward we sometimes take small steps backward. :')