fallintoplace opened a new pull request, #1217:
URL: https://github.com/apache/arrow-go/pull/1217

   ## Summary
   
   - **Skip metadata construction in `Encode`** for primitive values.
   - Keep `Of` unchanged for callers that need a complete `Value`.
   - Add byte-for-byte parity coverage for primitive types, boundaries, and 
options.
   - Add benchmarks for the encoded and metadata-building paths.
   
   ## Benchmark
   
   Apple M1 Pro, darwin/arm64. Times are rounded medians from 5 runs. `Of` is 
the previous metadata-building path.
   
   | Input | `Encode` | `Of` |
   | --- | ---: | ---: |
   | bool | 84 ns, 176 B, 3 allocs | 103 ns, 179 B, 4 allocs |
   | int64 max | 101 ns, 192 B, 5 allocs | 126 ns, 200 B, 6 allocs |
   | short string | 96 ns, 192 B, 4 allocs | 121 ns, 195 B, 5 allocs |
   | long string | 154 ns, 276 B, 6 allocs | 182 ns, 280 B, 7 allocs |
   | decimal128 | 148 ns, 216 B, 6 allocs | 167 ns, 224 B, 7 allocs |
   
   ## Tests
   
   - `go test ./parquet/variant -count=1`
   - `go test -race ./parquet/variant -run '^TestEncodeMatchesOf$' -count=1`
   - `go vet ./parquet/variant`
   - `PARQUET_TEST_DATA="$PWD/parquet-testing/data" go test -count=1 ./...`
   


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