[PR] perf(parquet): reuse dictionary RLE decoder across pages [arrow-go]

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

fallintoplace opened a new pull request, #1247:
URL: https://github.com/apache/arrow-go/pull/1247

   ## Summary
   
   - **Reuse the dictionary RLE decoder between data pages.**
   - Reset the existing `TypedRleDecoder` and its `bytes.Reader` in `SetData`.
   - Keep the current bit-width validation and empty-page behavior.
   - Add a page-transition regression test covering partial runs, literal runs, and empty data.
   - Add small-page and `SetData` allocation benchmarks.
   
   ## Benchmark
   
   Local Apple M1 Pro run with `GOMAXPROCS=1`: repeated `SetData` improved from about **0.6-1.0 us / 4.9 KiB / 3 allocs** to **6.3 ns / 0 B / 0 allocs**.
   
   ## Tests
   
   - `go test ./parquet/internal/encoding ./parquet/internal/utils`
   - `go test -race ./parquet/internal/encoding ./parquet/internal/utils`
   - `go vet -composites=false ./parquet/internal/encoding ./parquet/internal/utils`
   - `GOOS=linux GOARCH=386 go test -c -o /dev/null ./parquet/internal/encoding`
   
   ## User-facing changes
   
   No.


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Re: [PR] perf(parquet): reuse dictionary RLE decoder across pages [arrow-go]

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

zeroshade merged PR #1247:
URL: https://github.com/apache/arrow-go/pull/1247


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