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#[cfg(feature = "object")]
use crate::chunked_array::object::builder::ObjectChunkedBuilder;
use crate::prelude::*;
use crate::utils::slice_offsets;
#[cfg(feature = "object")]
use arrow::array::Array;
use arrow::compute::concatenate;
#[inline]
fn slice(
chunks: &[ArrayRef],
offset: i64,
slice_length: usize,
own_length: usize,
) -> Vec<ArrayRef> {
let mut new_chunks = Vec::with_capacity(1);
let (raw_offset, slice_len) = slice_offsets(offset, slice_length, own_length);
let mut remaining_length = slice_len;
let mut remaining_offset = raw_offset;
for chunk in chunks {
let chunk_len = chunk.len();
if remaining_offset > 0 && remaining_offset >= chunk_len {
remaining_offset -= chunk_len;
continue;
}
let take_len = if remaining_length + remaining_offset > chunk_len {
chunk_len - remaining_offset
} else {
remaining_length
};
debug_assert!(remaining_offset + take_len <= chunk.len());
unsafe {
new_chunks.push(chunk.slice_unchecked(remaining_offset, take_len).into());
}
remaining_length -= take_len;
remaining_offset = 0;
if remaining_length == 0 {
break;
}
}
new_chunks
}
impl<T> ChunkOps for ChunkedArray<T>
where
T: PolarsNumericType,
{
fn rechunk(&self) -> Self {
if self.chunks().len() == 1 {
self.clone()
} else {
let chunks = vec![concatenate::concatenate(
self.chunks
.iter()
.map(|a| &**a)
.collect::<Vec<_>>()
.as_slice(),
)
.unwrap()
.into()];
ChunkedArray::from_chunks(self.name(), chunks)
}
}
#[inline]
fn slice(&self, offset: i64, length: usize) -> Self {
self.copy_with_chunks(slice(&self.chunks, offset, length, self.len()))
}
}
impl ChunkOps for BooleanChunked {
fn rechunk(&self) -> Self {
if self.chunks().len() == 1 {
self.clone()
} else {
let chunks = vec![concatenate::concatenate(
self.chunks
.iter()
.map(|a| &**a)
.collect::<Vec<_>>()
.as_slice(),
)
.unwrap()
.into()];
ChunkedArray::from_chunks(self.name(), chunks)
}
}
#[inline]
fn slice(&self, offset: i64, length: usize) -> Self {
self.copy_with_chunks(slice(&self.chunks, offset, length, self.len()))
}
}
impl ChunkOps for Utf8Chunked {
fn rechunk(&self) -> Self {
if self.chunks().len() == 1 {
self.clone()
} else {
let chunks = vec![concatenate::concatenate(
self.chunks
.iter()
.map(|a| &**a)
.collect::<Vec<_>>()
.as_slice(),
)
.unwrap()
.into()];
ChunkedArray::from_chunks(self.name(), chunks)
}
}
#[inline]
fn slice(&self, offset: i64, length: usize) -> Self {
self.copy_with_chunks(slice(&self.chunks, offset, length, self.len()))
}
}
impl ChunkOps for ListChunked {
fn rechunk(&self) -> Self {
if self.chunks.len() == 1 {
self.clone()
} else {
let chunks = vec![concatenate::concatenate(
self.chunks
.iter()
.map(|a| &**a)
.collect::<Vec<_>>()
.as_slice(),
)
.unwrap()
.into()];
let mut ca = ListChunked::from_chunks(self.name(), chunks);
if self.can_fast_explode() {
ca.set_fast_explode()
}
ca
}
}
#[inline]
fn slice(&self, offset: i64, length: usize) -> Self {
self.copy_with_chunks(slice(&self.chunks, offset, length, self.len()))
}
}
#[cfg(feature = "object")]
impl<T> ChunkOps for ObjectChunked<T>
where
T: PolarsObject,
{
fn rechunk(&self) -> Self
where
Self: std::marker::Sized,
{
if self.chunks.len() == 1 {
self.clone()
} else {
let mut builder = ObjectChunkedBuilder::new(self.name(), self.len());
let chunks = self.downcast_iter();
if !self.has_validity() {
for arr in chunks {
for idx in 0..arr.len() {
builder.append_value(arr.value(idx).clone())
}
}
} else {
for arr in chunks {
for idx in 0..arr.len() {
if arr.is_valid(idx) {
builder.append_value(arr.value(idx).clone())
} else {
builder.append_null()
}
}
}
}
builder.finish()
}
}
#[inline]
fn slice(&self, offset: i64, length: usize) -> Self {
self.copy_with_chunks(slice(&self.chunks, offset, length, self.len()))
}
}
#[cfg(test)]
mod test {
use crate::prelude::*;
#[test]
#[cfg(feature = "dtype-categorical")]
fn test_categorical_map_after_rechunk() {
let s = Series::new("", &["foo", "bar", "spam"]);
let mut a = s.cast(&DataType::Categorical(None)).unwrap();
a.append(&a.slice(0, 2)).unwrap();
let a = a.rechunk();
assert!(a.categorical().unwrap().get_rev_map().len() > 0);
}
}
