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use rayon::prelude::*;
use crate::prelude::*;
unsafe fn idx_to_array(idx: usize, arr: &ListArray<i64>, dtype: &DataType) -> Option<Series> {
if arr.is_valid(idx) {
Some(arr.value_unchecked(idx))
.map(|arr: ArrayRef| Series::from_chunks_and_dtype_unchecked("", vec![arr], dtype))
} else {
None
}
}
impl ListChunked {
pub fn par_iter(&self) -> impl ParallelIterator<Item = Option<Series>> + '_ {
self.chunks
.par_iter()
.map(move |arr| {
let dtype = self.inner_dtype();
let arr = &**arr;
let arr = unsafe { &*(arr as *const dyn Array as *const ListArray<i64>) };
(0..arr.len())
.into_par_iter()
.map(move |idx| unsafe { idx_to_array(idx, arr, &dtype) })
})
.flatten()
}
pub fn par_iter_indexed(&mut self) -> impl IndexedParallelIterator<Item = Option<Series>> + '_ {
*self = self.rechunk();
let arr = self.downcast_iter().next().unwrap();
let dtype = self.inner_dtype();
(0..arr.len())
.into_par_iter()
.map(move |idx| unsafe { idx_to_array(idx, arr, &dtype) })
}
}