use std::sync::Arc;
use arrow::array::ArrayFromIter;
use arrow::bitmap::Bitmap;
use crate::chunked_array::object::{ObjectArray, PolarsObject};
impl<'a, T: PolarsObject> ArrayFromIter<&'a T> for ObjectArray<T> {
fn arr_from_iter<I: IntoIterator<Item = &'a T>>(iter: I) -> Self {
Self::try_arr_from_iter(iter.into_iter().map(|o| -> Result<_, ()> { Ok(Some(o)) })).unwrap()
}
fn try_arr_from_iter<E, I: IntoIterator<Item = Result<&'a T, E>>>(iter: I) -> Result<Self, E> {
Self::try_arr_from_iter(iter.into_iter().map(|o| Ok(Some(o?))))
}
}
impl<'a, T: PolarsObject> ArrayFromIter<Option<&'a T>> for ObjectArray<T> {
fn arr_from_iter<I: IntoIterator<Item = Option<&'a T>>>(iter: I) -> Self {
Self::try_arr_from_iter(iter.into_iter().map(|o| -> Result<_, ()> { Ok(o) })).unwrap()
}
fn try_arr_from_iter<E, I: IntoIterator<Item = Result<Option<&'a T>, E>>>(
iter: I,
) -> Result<Self, E> {
let iter = iter.into_iter();
let size = iter.size_hint().0;
let mut null_mask_builder = arrow::bitmap::MutableBitmap::with_capacity(size);
let values: Vec<T> = iter
.map(|value| match value? {
Some(value) => {
null_mask_builder.push(true);
Ok(value.clone())
},
None => {
null_mask_builder.push(false);
Ok(T::default())
},
})
.collect::<Result<Vec<T>, E>>()?;
let null_bit_buffer: Option<Bitmap> = null_mask_builder.into();
let null_bitmap = null_bit_buffer;
let len = values.len();
Ok(ObjectArray {
values: Arc::new(values),
null_bitmap,
offset: 0,
len,
})
}
}