realonbebeto opened a new issue, #9380:
URL: https://github.com/apache/arrow-rs/issues/9380
**Describe the bug**
<!--
The Format infer_schema does not update the null flag (by default it's true).
-->
**To Reproduce**
<!--
Run the following on any csv file and the Fields will be always null even
when they are not supposed to.
```
use std::fs::File;
use arrow::csv::Format;
let mut file = File::open(path)?;
let (schema, _) = Format::default()
.with_header(source.metadata.has_header)
.infer_schema(&mut file, Some(source.metadata.num_rows))?;
```
The line of code in infer_schema defaulting to true
```
// build schema from inference results
let fields: Fields = column_types
.iter()
.zip(&headers)
.map(|(inferred, field_name)| Field::new(field_name,
inferred.get(), true))
.collect();
```
-->
**Expected behaviour**
<!--
On running on a csv, the null flag should be updated accordingly if the
field inferred is actually null or not. Besides, there is a disconnect to use
the null regex and the null flag always being true.
-->
**Additional context**
<!--
Add any other context about the problem here.
-->
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