arrow_array/array/fixed_size_list_array.rs
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// Licensed to the Apache Software Foundation (ASF) under one
// or more contributor license agreements. See the NOTICE file
// distributed with this work for additional information
// regarding copyright ownership. The ASF licenses this file
// to you under the Apache License, Version 2.0 (the
// "License"); you may not use this file except in compliance
// with the License. You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied. See the License for the
// specific language governing permissions and limitations
// under the License.
use crate::array::print_long_array;
use crate::builder::{FixedSizeListBuilder, PrimitiveBuilder};
use crate::iterator::FixedSizeListIter;
use crate::{make_array, Array, ArrayAccessor, ArrayRef, ArrowPrimitiveType};
use arrow_buffer::buffer::NullBuffer;
use arrow_buffer::ArrowNativeType;
use arrow_data::{ArrayData, ArrayDataBuilder};
use arrow_schema::{ArrowError, DataType, FieldRef};
use std::any::Any;
use std::sync::Arc;
/// An array of [fixed length lists], similar to JSON arrays
/// (e.g. `["A", "B"]`).
///
/// Lists are represented using a `values` child
/// array where each list has a fixed size of `value_length`.
///
/// Use [`FixedSizeListBuilder`] to construct a [`FixedSizeListArray`].
///
/// # Representation
///
/// A [`FixedSizeListArray`] can represent a list of values of any other
/// supported Arrow type. Each element of the `FixedSizeListArray` itself is
/// a list which may contain NULL and non-null values,
/// or may itself be NULL.
///
/// For example, this `FixedSizeListArray` stores lists of strings:
///
/// ```text
/// ┌─────────────┐
/// │ [A,B] │
/// ├─────────────┤
/// │ NULL │
/// ├─────────────┤
/// │ [C,NULL] │
/// └─────────────┘
/// ```
///
/// The `values` of this `FixedSizeListArray`s are stored in a child
/// [`StringArray`] where logical null values take up `values_length` slots in the array
/// as shown in the following diagram. The logical values
/// are shown on the left, and the actual `FixedSizeListArray` encoding on the right
///
/// ```text
/// ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┐
/// ┌ ─ ─ ─ ─ ─ ─ ─ ─┐
/// ┌─────────────┐ │ ┌───┐ ┌───┐ ┌──────┐ │
/// │ [A,B] │ │ 1 │ │ │ 1 │ │ A │ │ 0
/// ├─────────────┤ │ ├───┤ ├───┤ ├──────┤ │
/// │ NULL │ │ 0 │ │ │ 1 │ │ B │ │ 1
/// ├─────────────┤ │ ├───┤ ├───┤ ├──────┤ │
/// │ [C,NULL] │ │ 1 │ │ │ 0 │ │ ???? │ │ 2
/// └─────────────┘ │ └───┘ ├───┤ ├──────┤ │
/// | │ 0 │ │ ???? │ │ 3
/// Logical Values │ Validity ├───┤ ├──────┤ │
/// (nulls) │ │ 1 │ │ C │ │ 4
/// │ ├───┤ ├──────┤ │
/// │ │ 0 │ │ ???? │ │ 5
/// │ └───┘ └──────┘ │
/// │ Values │
/// │ FixedSizeListArray (Array) │
/// └ ─ ─ ─ ─ ─ ─ ─ ─┘
/// └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ┘
/// ```
///
/// # Example
///
/// ```
/// # use std::sync::Arc;
/// # use arrow_array::{Array, FixedSizeListArray, Int32Array};
/// # use arrow_data::ArrayData;
/// # use arrow_schema::{DataType, Field};
/// # use arrow_buffer::Buffer;
/// // Construct a value array
/// let value_data = ArrayData::builder(DataType::Int32)
/// .len(9)
/// .add_buffer(Buffer::from_slice_ref(&[0, 1, 2, 3, 4, 5, 6, 7, 8]))
/// .build()
/// .unwrap();
/// let list_data_type = DataType::FixedSizeList(
/// Arc::new(Field::new_list_field(DataType::Int32, false)),
/// 3,
/// );
/// let list_data = ArrayData::builder(list_data_type.clone())
/// .len(3)
/// .add_child_data(value_data.clone())
/// .build()
/// .unwrap();
/// let list_array = FixedSizeListArray::from(list_data);
/// let list0 = list_array.value(0);
/// let list1 = list_array.value(1);
/// let list2 = list_array.value(2);
///
/// assert_eq!( &[0, 1, 2], list0.as_any().downcast_ref::<Int32Array>().unwrap().values());
/// assert_eq!( &[3, 4, 5], list1.as_any().downcast_ref::<Int32Array>().unwrap().values());
/// assert_eq!( &[6, 7, 8], list2.as_any().downcast_ref::<Int32Array>().unwrap().values());
/// ```
///
/// [`StringArray`]: crate::array::StringArray
/// [fixed size arrays](https://arrow.apache.org/docs/format/Columnar.html#fixed-size-list-layout)
#[derive(Clone)]
pub struct FixedSizeListArray {
data_type: DataType, // Must be DataType::FixedSizeList(value_length)
values: ArrayRef,
nulls: Option<NullBuffer>,
value_length: i32,
len: usize,
}
impl FixedSizeListArray {
/// Create a new [`FixedSizeListArray`] with `size` element size, panicking on failure
///
/// # Panics
///
/// Panics if [`Self::try_new`] returns an error
pub fn new(field: FieldRef, size: i32, values: ArrayRef, nulls: Option<NullBuffer>) -> Self {
Self::try_new(field, size, values, nulls).unwrap()
}
/// Create a new [`FixedSizeListArray`] from the provided parts, returning an error on failure
///
/// # Errors
///
/// * `size < 0`
/// * `values.len() / size != nulls.len()`
/// * `values.data_type() != field.data_type()`
/// * `!field.is_nullable() && !nulls.expand(size).contains(values.logical_nulls())`
pub fn try_new(
field: FieldRef,
size: i32,
values: ArrayRef,
nulls: Option<NullBuffer>,
) -> Result<Self, ArrowError> {
let s = size.to_usize().ok_or_else(|| {
ArrowError::InvalidArgumentError(format!("Size cannot be negative, got {}", size))
})?;
let len = match s {
0 => nulls.as_ref().map(|x| x.len()).unwrap_or_default(),
_ => {
let len = values.len() / s.max(1);
if let Some(n) = nulls.as_ref() {
if n.len() != len {
return Err(ArrowError::InvalidArgumentError(format!(
"Incorrect length of null buffer for FixedSizeListArray, expected {} got {}",
len,
n.len(),
)));
}
}
len
}
};
if field.data_type() != values.data_type() {
return Err(ArrowError::InvalidArgumentError(format!(
"FixedSizeListArray expected data type {} got {} for {:?}",
field.data_type(),
values.data_type(),
field.name()
)));
}
if let Some(a) = values.logical_nulls() {
let nulls_valid = field.is_nullable()
|| nulls
.as_ref()
.map(|n| n.expand(size as _).contains(&a))
.unwrap_or_default()
|| (nulls.is_none() && a.null_count() == 0);
if !nulls_valid {
return Err(ArrowError::InvalidArgumentError(format!(
"Found unmasked nulls for non-nullable FixedSizeListArray field {:?}",
field.name()
)));
}
}
let data_type = DataType::FixedSizeList(field, size);
Ok(Self {
data_type,
values,
value_length: size,
nulls,
len,
})
}
/// Create a new [`FixedSizeListArray`] of length `len` where all values are null
///
/// # Panics
///
/// Panics if
///
/// * `size < 0`
/// * `size * len` would overflow `usize`
pub fn new_null(field: FieldRef, size: i32, len: usize) -> Self {
let capacity = size.to_usize().unwrap().checked_mul(len).unwrap();
Self {
values: make_array(ArrayData::new_null(field.data_type(), capacity)),
data_type: DataType::FixedSizeList(field, size),
nulls: Some(NullBuffer::new_null(len)),
value_length: size,
len,
}
}
/// Deconstruct this array into its constituent parts
pub fn into_parts(self) -> (FieldRef, i32, ArrayRef, Option<NullBuffer>) {
let f = match self.data_type {
DataType::FixedSizeList(f, _) => f,
_ => unreachable!(),
};
(f, self.value_length, self.values, self.nulls)
}
/// Returns a reference to the values of this list.
pub fn values(&self) -> &ArrayRef {
&self.values
}
/// Returns a clone of the value type of this list.
pub fn value_type(&self) -> DataType {
self.values.data_type().clone()
}
/// Returns ith value of this list array.
pub fn value(&self, i: usize) -> ArrayRef {
self.values
.slice(self.value_offset_at(i), self.value_length() as usize)
}
/// Returns the offset for value at index `i`.
///
/// Note this doesn't do any bound checking, for performance reason.
#[inline]
pub fn value_offset(&self, i: usize) -> i32 {
self.value_offset_at(i) as i32
}
/// Returns the length for an element.
///
/// All elements have the same length as the array is a fixed size.
#[inline]
pub const fn value_length(&self) -> i32 {
self.value_length
}
#[inline]
const fn value_offset_at(&self, i: usize) -> usize {
i * self.value_length as usize
}
/// Returns a zero-copy slice of this array with the indicated offset and length.
pub fn slice(&self, offset: usize, len: usize) -> Self {
assert!(
offset.saturating_add(len) <= self.len,
"the length + offset of the sliced FixedSizeListArray cannot exceed the existing length"
);
let size = self.value_length as usize;
Self {
data_type: self.data_type.clone(),
values: self.values.slice(offset * size, len * size),
nulls: self.nulls.as_ref().map(|n| n.slice(offset, len)),
value_length: self.value_length,
len,
}
}
/// Creates a [`FixedSizeListArray`] from an iterator of primitive values
/// # Example
/// ```
/// # use arrow_array::FixedSizeListArray;
/// # use arrow_array::types::Int32Type;
///
/// let data = vec![
/// Some(vec![Some(0), Some(1), Some(2)]),
/// None,
/// Some(vec![Some(3), None, Some(5)]),
/// Some(vec![Some(6), Some(7), Some(45)]),
/// ];
/// let list_array = FixedSizeListArray::from_iter_primitive::<Int32Type, _, _>(data, 3);
/// println!("{:?}", list_array);
/// ```
pub fn from_iter_primitive<T, P, I>(iter: I, length: i32) -> Self
where
T: ArrowPrimitiveType,
P: IntoIterator<Item = Option<<T as ArrowPrimitiveType>::Native>>,
I: IntoIterator<Item = Option<P>>,
{
let l = length as usize;
let iter = iter.into_iter();
let size_hint = iter.size_hint().0;
let mut builder = FixedSizeListBuilder::with_capacity(
PrimitiveBuilder::<T>::with_capacity(size_hint * l),
length,
size_hint,
);
for i in iter {
match i {
Some(p) => {
for t in p {
builder.values().append_option(t);
}
builder.append(true);
}
None => {
builder.values().append_nulls(l);
builder.append(false)
}
}
}
builder.finish()
}
/// constructs a new iterator
pub fn iter(&self) -> FixedSizeListIter<'_> {
FixedSizeListIter::new(self)
}
}
impl From<ArrayData> for FixedSizeListArray {
fn from(data: ArrayData) -> Self {
let value_length = match data.data_type() {
DataType::FixedSizeList(_, len) => *len,
_ => {
panic!("FixedSizeListArray data should contain a FixedSizeList data type")
}
};
let size = value_length as usize;
let values =
make_array(data.child_data()[0].slice(data.offset() * size, data.len() * size));
Self {
data_type: data.data_type().clone(),
values,
nulls: data.nulls().cloned(),
value_length,
len: data.len(),
}
}
}
impl From<FixedSizeListArray> for ArrayData {
fn from(array: FixedSizeListArray) -> Self {
let builder = ArrayDataBuilder::new(array.data_type)
.len(array.len)
.nulls(array.nulls)
.child_data(vec![array.values.to_data()]);
unsafe { builder.build_unchecked() }
}
}
impl Array for FixedSizeListArray {
fn as_any(&self) -> &dyn Any {
self
}
fn to_data(&self) -> ArrayData {
self.clone().into()
}
fn into_data(self) -> ArrayData {
self.into()
}
fn data_type(&self) -> &DataType {
&self.data_type
}
fn slice(&self, offset: usize, length: usize) -> ArrayRef {
Arc::new(self.slice(offset, length))
}
fn len(&self) -> usize {
self.len
}
fn is_empty(&self) -> bool {
self.len == 0
}
fn shrink_to_fit(&mut self) {
self.values.shrink_to_fit();
if let Some(nulls) = &mut self.nulls {
nulls.shrink_to_fit();
}
}
fn offset(&self) -> usize {
0
}
fn nulls(&self) -> Option<&NullBuffer> {
self.nulls.as_ref()
}
fn logical_null_count(&self) -> usize {
// More efficient that the default implementation
self.null_count()
}
fn get_buffer_memory_size(&self) -> usize {
let mut size = self.values.get_buffer_memory_size();
if let Some(n) = self.nulls.as_ref() {
size += n.buffer().capacity();
}
size
}
fn get_array_memory_size(&self) -> usize {
let mut size = std::mem::size_of::<Self>() + self.values.get_array_memory_size();
if let Some(n) = self.nulls.as_ref() {
size += n.buffer().capacity();
}
size
}
}
impl ArrayAccessor for FixedSizeListArray {
type Item = ArrayRef;
fn value(&self, index: usize) -> Self::Item {
FixedSizeListArray::value(self, index)
}
unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
FixedSizeListArray::value(self, index)
}
}
impl std::fmt::Debug for FixedSizeListArray {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "FixedSizeListArray<{}>\n[\n", self.value_length())?;
print_long_array(self, f, |array, index, f| {
std::fmt::Debug::fmt(&array.value(index), f)
})?;
write!(f, "]")
}
}
impl ArrayAccessor for &FixedSizeListArray {
type Item = ArrayRef;
fn value(&self, index: usize) -> Self::Item {
FixedSizeListArray::value(self, index)
}
unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
FixedSizeListArray::value(self, index)
}
}
#[cfg(test)]
mod tests {
use arrow_buffer::{bit_util, BooleanBuffer, Buffer};
use arrow_schema::Field;
use crate::cast::AsArray;
use crate::types::Int32Type;
use crate::{new_empty_array, Int32Array};
use super::*;
#[test]
fn test_fixed_size_list_array() {
// Construct a value array
let value_data = ArrayData::builder(DataType::Int32)
.len(9)
.add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7, 8]))
.build()
.unwrap();
// Construct a list array from the above two
let list_data_type =
DataType::FixedSizeList(Arc::new(Field::new_list_field(DataType::Int32, false)), 3);
let list_data = ArrayData::builder(list_data_type.clone())
.len(3)
.add_child_data(value_data.clone())
.build()
.unwrap();
let list_array = FixedSizeListArray::from(list_data);
assert_eq!(value_data, list_array.values().to_data());
assert_eq!(DataType::Int32, list_array.value_type());
assert_eq!(3, list_array.len());
assert_eq!(0, list_array.null_count());
assert_eq!(6, list_array.value_offset(2));
assert_eq!(3, list_array.value_length());
assert_eq!(0, list_array.value(0).as_primitive::<Int32Type>().value(0));
for i in 0..3 {
assert!(list_array.is_valid(i));
assert!(!list_array.is_null(i));
}
// Now test with a non-zero offset
let list_data = ArrayData::builder(list_data_type)
.len(2)
.offset(1)
.add_child_data(value_data.clone())
.build()
.unwrap();
let list_array = FixedSizeListArray::from(list_data);
assert_eq!(value_data.slice(3, 6), list_array.values().to_data());
assert_eq!(DataType::Int32, list_array.value_type());
assert_eq!(2, list_array.len());
assert_eq!(0, list_array.null_count());
assert_eq!(3, list_array.value(0).as_primitive::<Int32Type>().value(0));
assert_eq!(3, list_array.value_offset(1));
assert_eq!(3, list_array.value_length());
}
#[test]
#[should_panic(expected = "assertion failed: (offset + length) <= self.len()")]
// Different error messages, so skip for now
// https://github.com/apache/arrow-rs/issues/1545
#[cfg(not(feature = "force_validate"))]
fn test_fixed_size_list_array_unequal_children() {
// Construct a value array
let value_data = ArrayData::builder(DataType::Int32)
.len(8)
.add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7]))
.build()
.unwrap();
// Construct a list array from the above two
let list_data_type =
DataType::FixedSizeList(Arc::new(Field::new_list_field(DataType::Int32, false)), 3);
let list_data = unsafe {
ArrayData::builder(list_data_type)
.len(3)
.add_child_data(value_data)
.build_unchecked()
};
drop(FixedSizeListArray::from(list_data));
}
#[test]
fn test_fixed_size_list_array_slice() {
// Construct a value array
let value_data = ArrayData::builder(DataType::Int32)
.len(10)
.add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
.build()
.unwrap();
// Set null buts for the nested array:
// [[0, 1], null, null, [6, 7], [8, 9]]
// 01011001 00000001
let mut null_bits: [u8; 1] = [0; 1];
bit_util::set_bit(&mut null_bits, 0);
bit_util::set_bit(&mut null_bits, 3);
bit_util::set_bit(&mut null_bits, 4);
// Construct a fixed size list array from the above two
let list_data_type =
DataType::FixedSizeList(Arc::new(Field::new_list_field(DataType::Int32, false)), 2);
let list_data = ArrayData::builder(list_data_type)
.len(5)
.add_child_data(value_data.clone())
.null_bit_buffer(Some(Buffer::from(null_bits)))
.build()
.unwrap();
let list_array = FixedSizeListArray::from(list_data);
assert_eq!(value_data, list_array.values().to_data());
assert_eq!(DataType::Int32, list_array.value_type());
assert_eq!(5, list_array.len());
assert_eq!(2, list_array.null_count());
assert_eq!(6, list_array.value_offset(3));
assert_eq!(2, list_array.value_length());
let sliced_array = list_array.slice(1, 4);
assert_eq!(4, sliced_array.len());
assert_eq!(2, sliced_array.null_count());
for i in 0..sliced_array.len() {
if bit_util::get_bit(&null_bits, 1 + i) {
assert!(sliced_array.is_valid(i));
} else {
assert!(sliced_array.is_null(i));
}
}
// Check offset and length for each non-null value.
let sliced_list_array = sliced_array
.as_any()
.downcast_ref::<FixedSizeListArray>()
.unwrap();
assert_eq!(2, sliced_list_array.value_length());
assert_eq!(4, sliced_list_array.value_offset(2));
assert_eq!(6, sliced_list_array.value_offset(3));
}
#[test]
#[should_panic(expected = "the offset of the new Buffer cannot exceed the existing length")]
fn test_fixed_size_list_array_index_out_of_bound() {
// Construct a value array
let value_data = ArrayData::builder(DataType::Int32)
.len(10)
.add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
.build()
.unwrap();
// Set null buts for the nested array:
// [[0, 1], null, null, [6, 7], [8, 9]]
// 01011001 00000001
let mut null_bits: [u8; 1] = [0; 1];
bit_util::set_bit(&mut null_bits, 0);
bit_util::set_bit(&mut null_bits, 3);
bit_util::set_bit(&mut null_bits, 4);
// Construct a fixed size list array from the above two
let list_data_type =
DataType::FixedSizeList(Arc::new(Field::new_list_field(DataType::Int32, false)), 2);
let list_data = ArrayData::builder(list_data_type)
.len(5)
.add_child_data(value_data)
.null_bit_buffer(Some(Buffer::from(null_bits)))
.build()
.unwrap();
let list_array = FixedSizeListArray::from(list_data);
list_array.value(10);
}
#[test]
fn test_fixed_size_list_constructors() {
let values = Arc::new(Int32Array::from_iter([
Some(1),
Some(2),
None,
None,
Some(3),
Some(4),
]));
let field = Arc::new(Field::new_list_field(DataType::Int32, true));
let list = FixedSizeListArray::new(field.clone(), 2, values.clone(), None);
assert_eq!(list.len(), 3);
let nulls = NullBuffer::new_null(3);
let list = FixedSizeListArray::new(field.clone(), 2, values.clone(), Some(nulls));
assert_eq!(list.len(), 3);
let list = FixedSizeListArray::new(field.clone(), 4, values.clone(), None);
assert_eq!(list.len(), 1);
let err = FixedSizeListArray::try_new(field.clone(), -1, values.clone(), None).unwrap_err();
assert_eq!(
err.to_string(),
"Invalid argument error: Size cannot be negative, got -1"
);
let list = FixedSizeListArray::new(field.clone(), 0, values.clone(), None);
assert_eq!(list.len(), 0);
let nulls = NullBuffer::new_null(2);
let err = FixedSizeListArray::try_new(field, 2, values.clone(), Some(nulls)).unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: Incorrect length of null buffer for FixedSizeListArray, expected 3 got 2");
let field = Arc::new(Field::new_list_field(DataType::Int32, false));
let err = FixedSizeListArray::try_new(field.clone(), 2, values.clone(), None).unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: Found unmasked nulls for non-nullable FixedSizeListArray field \"item\"");
// Valid as nulls in child masked by parent
let nulls = NullBuffer::new(BooleanBuffer::new(Buffer::from([0b0000101]), 0, 3));
FixedSizeListArray::new(field, 2, values.clone(), Some(nulls));
let field = Arc::new(Field::new_list_field(DataType::Int64, true));
let err = FixedSizeListArray::try_new(field, 2, values, None).unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: FixedSizeListArray expected data type Int64 got Int32 for \"item\"");
}
#[test]
fn empty_fixed_size_list() {
let field = Arc::new(Field::new_list_field(DataType::Int32, true));
let nulls = NullBuffer::new_null(2);
let values = new_empty_array(&DataType::Int32);
let list = FixedSizeListArray::new(field.clone(), 0, values, Some(nulls));
assert_eq!(list.len(), 2);
}
}