polars_core/chunked_array/builder/
null.rsuse arrow::legacy::array::null::MutableNullArray;
use super::*;
use crate::series::implementations::null::NullChunked;
#[derive(Clone)]
pub struct NullChunkedBuilder {
array_builder: MutableNullArray,
pub(crate) field: Field,
}
impl NullChunkedBuilder {
pub fn new(name: PlSmallStr, len: usize) -> Self {
let array_builder = MutableNullArray::new(len);
NullChunkedBuilder {
array_builder,
field: Field::new(name, DataType::Null),
}
}
#[inline]
pub fn append_null(&mut self) {
self.array_builder.push_null()
}
pub fn finish(mut self) -> NullChunked {
let arr = self.array_builder.as_box();
let ca = NullChunked::new(self.field.name().clone(), arr.len());
ca
}
pub fn shrink_to_fit(&mut self) {
self.array_builder.shrink_to_fit()
}
}