refactor(rust): Fix new-streaming test_parquet::test_complex_types

[nameexhaustion]

Before

df.with_columns(s.alias("b")) = shape: (4, 2)
┌───────────────┬────────────────────┐
│ a             ┆ b                  │
│ ---           ┆ ---                │
│ array[i64, 3] ┆ array[i64, 3]      │
╞═══════════════╪════════════════════╡
│ null          ┆ null               │
│ [1, null, 3]  ┆ [1, null, 3]       │
│ null          ┆ [null, null, null] │
│ [1, 2, null]  ┆ [1, 2, null]       │
└───────────────┴────────────────────┘

After

df.with_columns(s.alias("b")) = shape: (4, 2)
┌───────────────┬───────────────┐
│ a             ┆ b             │
│ ---           ┆ ---           │
│ array[i64, 3] ┆ array[i64, 3] │
╞═══════════════╪═══════════════╡
│ null          ┆ null          │
│ [1, null, 3]  ┆ [1, null, 3]  │
│ null          ┆ null          │
│ [1, 2, null]  ┆ [1, 2, null]  │
└───────────────┴───────────────┘

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.86%. Comparing base (506f927) to head (6b73ded).
Report is 18 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #18829      +/-   ##
==========================================
- Coverage   79.86%   79.86%   -0.01%     
==========================================
  Files        1518     1518              
  Lines      205637   205636       -1     
  Branches     2893     2893              
==========================================
- Hits       164233   164224       -9     
- Misses      40856    40864       +8     
  Partials      548      548              

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