fix: Fix panic on schema merge for prefiltering

[nameexhaustion]

Fixes #19968

Panic caused by assuming that hive columns were always in the file in the merge for prefiltering

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.49%. Comparing base (742c737) to head (fbcc374).
Report is 5 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19972      +/-   ##
==========================================
+ Coverage   79.46%   79.49%   +0.02%     
==========================================
  Files        1555     1555              
  Lines      216322   216386      +64     
  Branches     2456     2456              
==========================================
+ Hits       171911   172023     +112     
+ Misses      43853    43805      -48     
  Partials      558      558              

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