The current implementation supports ParquetSerializer.DeserializeAsync with a rowGroupIndex, but iterating over many of these would open and close a ParquetReader every time. An additional method should be available that reads directly from a RowGroupReader so that only a single ParquetReader is needed.
Issue description
The current implementation supports
ParquetSerializer.DeserializeAsyncwith arowGroupIndex, but iterating over many of these would open and close aParquetReaderevery time. An additional method should be available that reads directly from aRowGroupReaderso that only a singleParquetReaderis needed.