fix: Don't load Parquet nested metadata

[coastalwhite]

Fixes #18136.

[codspeed-hq]

CodSpeed Performance Report

Merging #18183 will improve performances by 42.42%

_{Comparing coastalwhite:fix-parquet-nested-metadata (c321dc1) with main (8111493)}

Summary

⚡ 1 improvements
✅ 36 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	coastalwhite:fix-parquet-nested-metadata	Change
⚡	test_groupby_h2oai_q5	2.6 ms	1.8 ms	+42.42%

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.31%. Comparing base (21f02a6) to head (c321dc1).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #18183   +/-   ##
=======================================
  Coverage   80.31%   80.31%           
=======================================
  Files        1498     1500    +2     
  Lines      198654   198719   +65     
  Branches     2831     2833    +2     
=======================================
+ Hits       159555   159609   +54     
- Misses      38572    38583   +11     
  Partials      527      527           

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