fallintoplace opened a new pull request, #1197:
URL: https://github.com/apache/arrow-go/pull/1197

   ## Summary
   
   * Add a range writer for uint16 and uint32 take indices.
   * Use it when a filter block or bitmap run is fully selected.
   * Keep the scalar path for mixed blocks.
   * Add benchmarks for dense, clustered, alternating, short, and nullable 
filters.
   
   ## Benchmark
   
   On an Apple M1 Pro, the 1M-row all-selected case improved from about 3.0 ms 
to 0.5 ms locally. Fragmented filters stayed close to the baseline.
   
   ## Tests
   
   * `go test ./arrow/compute/internal/kernels ./arrow/compute`
   * `go test -race ./arrow/compute/internal/kernels ./arrow/compute`
   * Full package test run passed with the local Parquet test data checkout, 
excluding the CSV example that needs a separate Arrow CSV fixture.


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