Trait DataTypeExt

Source

pub trait DataTypeExt {
    // Required methods
    fn into_nullable_field(self) -> Field;
    fn into_nullable_field_ref(self) -> FieldRef;
}

Expand description

DataFusion extension methods for Arrow DataType

Required Methods§

Source

fn into_nullable_field(self) -> Field

Convert the type to field with nullable type and “” name

This is used to track the places where we convert a DataType into a nameless field to interact with an API that is capable of representing an extension type and/or nullability.

For example, it will convert a DataType::Int32 into Field::new("", DataType::Int32, true).

let dt = DataType::Utf8;
let field = dt.into_nullable_field();
// result is a nullable Utf8 field with "" name
assert_eq!(field.name(), "");
assert_eq!(field.data_type(), &DataType::Utf8);
assert!(field.is_nullable());

Source