HyukjinKwon opened a new pull request, #48907:
URL: https://github.com/apache/arrow/pull/48907
### Rationale for this change
`StructArray` diffing was inefficient because it compared all fields
together with no early termination. For a 10-field struct, even if the first
field differs, it checks all 10 fields.
### What changes are included in this PR?
Introduced `StructValueComparator` that compares struct fields independently
with early termination.
### Are these changes tested?
Yes, added `DiffTest.StructFieldComparison` and
`DiffTest.NestedStructComparison`
All existing struct diff tests pass. Plus, I verified this with local
benchmark (can be shared if asked).
### Are there any user-facing changes?
No behavioral changes but optimization for `Array.diff()`.
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