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Fix accessing name from ffi schema #131

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Fix accessing name from ffi schema #131

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9875740
Fix accessing name from ffi schema
kylebarron Aug 19, 2024
ad3ba8e
Add test
kylebarron Aug 19, 2024
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28 changes: 21 additions & 7 deletions arrow-schema/src/ffi.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -261,12 +261,17 @@ impl FFI_ArrowSchema {
}

/// returns the name of this schema.
pub fn name(&self) -> &str {
assert!(!self.name.is_null());
// safe because the lifetime of `self.name` equals `self`
unsafe { CStr::from_ptr(self.name) }
.to_str()
.expect("The external API has a non-utf8 as name")
pub fn name(&self) -> Option<&str> {
if self.name.is_null() {
None
} else {
// safe because the lifetime of `self.name` equals `self`
Some(
unsafe { CStr::from_ptr(self.name) }
.to_str()
.expect("The external API has a non-utf8 as name"),
)
}
}

pub fn flags(&self) -> Option<Flags> {
Expand Down Expand Up @@ -582,7 +587,7 @@ impl TryFrom<&FFI_ArrowSchema> for Field {

fn try_from(c_schema: &FFI_ArrowSchema) -> Result<Self, ArrowError> {
let dtype = DataType::try_from(c_schema)?;
let mut field = Field::new(c_schema.name(), dtype, c_schema.nullable());
let mut field = Field::new(c_schema.name().unwrap_or(""), dtype, c_schema.nullable());
field.set_metadata(c_schema.metadata()?);
Ok(field)
}
Expand Down Expand Up @@ -918,4 +923,13 @@ mod tests {
assert_eq!(field.metadata(), &metadata);
}
}

#[test]
fn test_import_field_with_null_name() {
let dtype = DataType::Int16;
let c_schema = FFI_ArrowSchema::try_from(&dtype).unwrap();
assert!(c_schema.name().is_none());
let field = Field::try_from(&c_schema).unwrap();
assert_eq!(field.name(), "");
}
}