Method with_keys_field

arrow-array/src/builder/map_builder.rs:122–127

Override the field passed to [`MapBuilder::new`] By default, a non-nullable field is created with the name `keys` Note: [`Self::finish`] and [`Self::finish_cloned`] will panic if the field's data type does not match that of `K` or the field is nullable

(self, field: impl Into<FieldRef>)

    /// Note: [`Self::finish`] and [`Self::finish_cloned`] will panic if the
    /// field's data type does not match that of `K` or the field is nullable
    pub fn with_keys_field(self, field: impl Into<FieldRef>) -> Self {
        Self {
            key_field: Some(field.into()),
            ..self
        }
    }

    /// Override the field passed to [`MapBuilder::new`]
    ///