[I] [Ruby] Provide an equivalent of Pyarrow's `.to_pylist` [arrow]

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

fpacanowski opened a new issue, #45122:
URL: https://github.com/apache/arrow/issues/45122

   ### Describe the enhancement requested
   
   In certain use cases it's quite useful to convert a `RecordBatch` or a `Table` to an array of hashes, e.g. when using Parquet for data exchange. Pyarrow provides this functionality as [to_pylist](https://arrow.apache.org/docs/python/generated/pyarrow.Table.html#pyarrow.Table.to_pylist) function.
   
   Basically I'd love to see an inverse of `Arrow::RecordBatchBuilder.build`.
   ```ruby
   rb = Arrow::RecordBatchBuilder.build(schema, data)
   assert rb.to_pylist == data
   ```
   
   Additionally it would be great if it correctly handled struct and list data type, for example:
   ```ruby
   schema = Arrow::Schema.new([
     Arrow::Field.new("c1", :int32),
     Arrow::Field.new("c2",
       Arrow::StructDataType.new([
         Arrow::Field.new("c3", :int32),
         Arrow::Field.new("c4",
           Arrow::StructDataType.new([
             Arrow::Field.new("c5", :int32),
             Arrow::Field.new("c6", Arrow::ListDataType.new(:int32)),
           ])
         )
       ])
     )
   ])
   
   data = [
       {c1: 1, c2: {c3: 3, c4: {c5: 5, c6: [6, 7]}}},
       {c1: 11, c2: {c3: 13, c4: {c5: 15, c6: [16, 17]}}},
   ]
   rb = Arrow::RecordBatchBuilder.build(schema, data)
   assert rb.to_pylist == data
   ```
   
   (Obviously the method wouldn't be named `to_pylist`.)
   
   ### Component(s)
   
   Ruby


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Re: [I] [Ruby] Provide an equivalent of Pyarrow's `.to_pylist` [arrow]

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

kou commented on issue #45122:
URL: https://github.com/apache/arrow/issues/45122#issuecomment-2566177335

   We have `Arrow::RecordBatch#raw_records`/`Arrow::Table#raw_records` and `#each_raw_record`.
   But they don't add keys: `[1, {"c3" => 3, "c4" => {"c5" => 5, "c6" => [6, 7]}}]`


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Re: [I] [Ruby] Provide an equivalent of Pyarrow's `.to_pylist` [arrow]

["github-actions[bot] (via GitHub)" <gi...@apache.org>]

github-actions[bot] commented on issue #45122:
URL: https://github.com/apache/arrow/issues/45122#issuecomment-4004353970

   This issue has been marked as stale because it has had no activity in the past 365 days. Please remove the stale label or comment below, or this issue will be closed in 14 days. If this improvement is still desired but has no current owner, please add the 'Status: needs champion' label.


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