Paul-Folbrecht opened a new issue, #7132:
URL: https://github.com/apache/arrow-rs/issues/7132
Your sample:
```
#[derive(ParquetRecordReader)]
struct ACompleteRecord {
pub a_bool: bool,
pub a_string: String,
}
pub fn read_some_records() -> Vec<ACompleteRecord> {
let mut samples: Vec<ACompleteRecord> = Vec::new();
let file = File::open("some_file.parquet").unwrap();
let reader = SerializedFileReader::new(file).unwrap();
let mut row_group = reader.get_row_group(0).unwrap();
samples.read_from_row_group(&mut *row_group, 1).unwrap();
samples
}
```
The
[docs](https://arrow.apache.org/rust/parquet/record/trait.RecordReader.html#tymethod.read_from_row_group)
state
"Read up to num_records records from row_group_reader into self."
But if you pass more than the number of rows in the file, you get an error
like
```
thread 'parquet_reader::test_read_records' panicked at
services/src/parquet_reader.rs:10:10:
index out of bounds: the len is 66945 but the index is 66945
```
Since there's no way to determine the number of rows without iterating once,
this is a problem.
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