MINOR: Replace checked_add/sub().unwrap() with +/-

[HaoYang670]

Signed-off-by: remzi [email protected]

Which issue does this PR close?

None.
Related to #1918.

Are there any user-facing changes?

No.

[codecov-commenter]

Codecov Report

Merging #1924 (da82e0c) into master (fc4044f) will decrease coverage by 0.01%.
The diff coverage is 87.45%.

❗ Current head da82e0c differs from pull request most recent head 4c118b3. Consider uploading reports for the commit 4c118b3 to get more accurate results

@@            Coverage Diff             @@
##           master    #1924      +/-   ##
==========================================
- Coverage   83.43%   83.41%   -0.02%     
==========================================
  Files         203      214      +11     
  Lines       56969    57004      +35     
==========================================
+ Hits        47531    47550      +19     
- Misses       9438     9454      +16     

Impacted Files	Coverage Δ
arrow/src/array/mod.rs	100.00% <ø> (ø)
arrow/src/compute/kernels/temporal.rs	94.64% <ø> (ø)
arrow/src/datatypes/datatype.rs	65.42% <ø> (-0.38%)	⬇️
parquet/src/column/reader.rs	68.61% <0.00%> (ø)
arrow/src/array/array_binary.rs	94.18% <66.66%> (ø)
arrow/src/array/builder/decimal_builder.rs	69.18% <69.18%> (ø)
arrow/src/array/builder/boolean_builder.rs	75.75% <75.75%> (ø)
arrow/src/array/builder/union_builder.rs	76.99% <76.99%> (ø)
arrow/src/array/builder/struct_builder.rs	77.47% <77.47%> (ø)
.../src/array/builder/primitive_dictionary_builder.rs	78.18% <78.18%> (ø)
... and 25 more

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[tustvold]

This pr appears to have what appears to be a broken rebase?

[HaoYang670]

Sorry, I am a little confused about what the broken rebase means?

[tustvold]

It appears to have sorted itself out, it was showing a massive diff of unrelated changes. I think GitHub got confused 😅