[PR] perf(parquet): reuse fixed-length zero scratch [arrow-go]

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

fallintoplace opened a new pull request, #1236:
URL: https://github.com/apache/arrow-go/pull/1236

   ## Summary
   
   - Reuse a zero-value buffer in `PlainFixedLenByteArrayEncoder`.
   - Allocate it lazily only when `Put` sees a nil value.
   - Clear the buffer reference when the encoder is released.
   - Add coverage for lazy creation and reuse.
   - Add benchmarks for widths 4, 16, and 32 with repeated small `Put` calls.
   
   ## Benchmark
   
   Apple M1 Pro. Median of 3 runs. All-valid input.
   
   | width | rows per put | puts | upstream main | this PR | change |
   | ---: | ---: | ---: | ---: | ---: | ---: |
   | 4 | 1 | 64 | 489 ns | 470 ns | -4% |
   | 16 | 1 | 64 | 516 ns | 470 ns | -9% |
   | 32 | 1 | 64 | 498 ns | 471 ns | -5% |
   
   The benchmark also covers 1, 16, and 1024 rows with 1, 64, and 1024 repeated puts, plus sparse nil input.
   
   ```text
   go test ./parquet/internal/encoding -run '^$' -bench 'BenchmarkPlainEncodingFixedLenByteArray' -benchmem -benchtime=100ms -count=3
   ```
   
   ## Tests
   
   - `go test ./parquet/internal/encoding -count=1`
   - `PARQUET_TEST_DATA=/path/to/parquet-testing/data go test ./parquet/file ./parquet/pqarrow -count=1`
   - `PARQUET_TEST_DATA=/path/to/parquet-testing/data go test -race ./parquet/internal/encoding ./parquet/file ./parquet/pqarrow -count=1`
   - `go vet ./parquet/internal/encoding ./parquet/file ./parquet/pqarrow`
   


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Re: [PR] perf(parquet): reuse fixed-length zero scratch [arrow-go]

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

zeroshade merged PR #1236:
URL: https://github.com/apache/arrow-go/pull/1236


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