vustef commented on PR #8715:
URL: https://github.com/apache/arrow-rs/pull/8715#issuecomment-3492708302
@alamb here's a proposal for the API implemented at this moment in this PR:
```
let file = File::open(path).unwrap();
let row_number_field = Field::new("row_number", ArrowDataType::Int64,
false).with_extension_type(RowNumber);
let options =
ArrowReaderOptions::new().with_virtual_columns(vec![row_number_field]);
let reader = ParquetRecordBatchReaderBuilder::try_new_with_options(file,
options)
.unwrap()
.build()
.expect("Could not create reader");
reader
.collect::<Result<Vec<_>, _>>()
.expect("Could not read")
```
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