[GitHub] [arrow-datafusion] andygrove commented on issue #3800: [RUST][Datafusion] What causes "Error: Execution("file size of 4 is less than footer")" error?

[GitBox <gi...@apache.org>]

andygrove commented on issue #3800:
URL: https://github.com/apache/arrow-datafusion/issues/3800#issuecomment-1275214834

   The plot thickens... I ran this unit test in df:
   
   ```
   #[tokio::test]
   async fn main() -> datafusion::error::Result<()> {
       let ctx: SessionContext = SessionContext::new();
       let raw_covid_path: &str = "/mnt/bigdata/covid/owid-covid-data.csv";
       let covid_df = ctx.read_csv(raw_covid_path,
                                   CsvReadOptions::new()).await?;
       let batches = covid_df.collect().await?;
       for batch in &batches {
           println!("{}", batch.num_rows());
       }
       Ok(())
   }
   ```
   
   fails with:
   
   ```
   Error: ArrowError(InvalidArgumentError("Column 'population' is declared as non-nullable but contains null values"))
   ```
   
   so it appears we have 2 separate issues:
   
   - schema inference on partial scan says field is non-null but there are nulls .. maybe that is fine
   - errors seem to be consumed and ignored when reading csv and writing to another format


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