[PR] perf(arrow/array): compare union values in runs [arrow-go]

["fallintoplace (via GitHub)" <gi...@apache.org>]

fallintoplace opened a new pull request, #1244:
URL: https://github.com/apache/arrow-go/pull/1244

   ## Summary
   
   - **Batch consecutive union values with the same type code.**
   - Sparse unions compare one child slice per run.
   - Dense unions batch only when both child offset sequences are contiguous.
   - Apply the same path to exact and approximate equality.
   - Add sliced, null, skipped-offset, mismatch, and benchmark coverage.
   
   ## Benchmark
   
   Local Apple M1 Pro run with 65,536 rows and 64-row type runs:
   
   - Sparse `Equal`: **14.8 ms -> 0.95 ms**, **262,150 -> 4,102 allocs/op**
   - Dense `Equal`: **13.9 ms -> 1.04 ms**, **262,150 -> 4,102 allocs/op**
   - Alternating type codes stay roughly flat, as expected.
   
   ## Tests
   
   - `go test ./...`
   - `go vet ./arrow/array`
   - `GOOS=linux GOARCH=386 go build ./arrow/array/...`


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Re: [PR] perf(arrow/array): compare union values in runs [arrow-go]

["zeroshade (via GitHub)" <gi...@apache.org>]

zeroshade merged PR #1244:
URL: https://github.com/apache/arrow-go/pull/1244


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