Fix clippy

[alamb]

Rationale for this change

Fix a clippy error introduced by #878

I think due to a logical conflict with #591

What changes are included in this PR?

remove unnecessary use

Are there any user-facing changes?

no

[codecov-commenter]

Codecov Report

Merging #900 (995427f) into master (06f730e) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 995427f differs from pull request most recent head bd69580. Consider uploading reports for the commit bd69580 to get more accurate results

@@            Coverage Diff             @@
##           master     #900      +/-   ##
==========================================
- Coverage   82.30%   82.30%   -0.01%     
==========================================
  Files         168      168              
  Lines       48031    48029       -2     
==========================================
- Hits        39533    39530       -3     
- Misses       8498     8499       +1     

Impacted Files	Coverage Δ
parquet/src/util/bit_packing.rs	99.96% <ø> (ø)
parquet/src/util/bit_util.rs	93.19% <ø> (ø)
arrow/src/compute/kernels/comparison.rs	92.63% <100.00%> (ø)
parquet/src/util/hash_util.rs	95.65% <100.00%> (-0.13%)	⬇️
parquet_derive/src/parquet_field.rs	65.98% <0.00%> (-0.46%)	⬇️
arrow/src/datatypes/datatype.rs	64.93% <0.00%> (-0.44%)	⬇️
arrow/src/array/transform/mod.rs	85.33% <0.00%> (+0.13%)	⬆️
parquet/src/encodings/encoding.rs	93.71% <0.00%> (+0.19%)	⬆️

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[jimexist]

would call for using murmur hash 3 if possible

[alamb]

@jimexist shall I file a ticket? I don't really know why the parquet implementation is using its own hash function rather than, say, aHash or some other standard hashing library in rust