arrow_array/array/byte_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::{get_offsets, print_long_array};
use crate::builder::GenericByteBuilder;
use crate::iterator::ArrayIter;
use crate::types::bytes::ByteArrayNativeType;
use crate::types::ByteArrayType;
use crate::{Array, ArrayAccessor, ArrayRef, OffsetSizeTrait, Scalar};
use arrow_buffer::{ArrowNativeType, Buffer, MutableBuffer};
use arrow_buffer::{NullBuffer, OffsetBuffer};
use arrow_data::{ArrayData, ArrayDataBuilder};
use arrow_schema::{ArrowError, DataType};
use std::any::Any;
use std::sync::Arc;
/// An array of [variable length byte arrays](https://arrow.apache.org/docs/format/Columnar.html#variable-size-binary-layout)
///
/// See [`StringArray`] and [`LargeStringArray`] for storing utf8 encoded string data
///
/// See [`BinaryArray`] and [`LargeBinaryArray`] for storing arbitrary bytes
///
/// # Example: From a Vec
///
/// ```
/// # use arrow_array::{Array, GenericByteArray, types::Utf8Type};
/// let arr: GenericByteArray<Utf8Type> = vec!["hello", "world", ""].into();
/// assert_eq!(arr.value_data(), b"helloworld");
/// assert_eq!(arr.value_offsets(), &[0, 5, 10, 10]);
/// let values: Vec<_> = arr.iter().collect();
/// assert_eq!(values, &[Some("hello"), Some("world"), Some("")]);
/// ```
///
/// # Example: From an optional Vec
///
/// ```
/// # use arrow_array::{Array, GenericByteArray, types::Utf8Type};
/// let arr: GenericByteArray<Utf8Type> = vec![Some("hello"), Some("world"), Some(""), None].into();
/// assert_eq!(arr.value_data(), b"helloworld");
/// assert_eq!(arr.value_offsets(), &[0, 5, 10, 10, 10]);
/// let values: Vec<_> = arr.iter().collect();
/// assert_eq!(values, &[Some("hello"), Some("world"), Some(""), None]);
/// ```
///
/// # Example: From an iterator of option
///
/// ```
/// # use arrow_array::{Array, GenericByteArray, types::Utf8Type};
/// let arr: GenericByteArray<Utf8Type> = (0..5).map(|x| (x % 2 == 0).then(|| x.to_string())).collect();
/// let values: Vec<_> = arr.iter().collect();
/// assert_eq!(values, &[Some("0"), None, Some("2"), None, Some("4")]);
/// ```
///
/// # Example: Using Builder
///
/// ```
/// # use arrow_array::Array;
/// # use arrow_array::builder::GenericByteBuilder;
/// # use arrow_array::types::Utf8Type;
/// let mut builder = GenericByteBuilder::<Utf8Type>::new();
/// builder.append_value("hello");
/// builder.append_null();
/// builder.append_value("world");
/// let array = builder.finish();
/// let values: Vec<_> = array.iter().collect();
/// assert_eq!(values, &[Some("hello"), None, Some("world")]);
/// ```
///
/// [`StringArray`]: crate::StringArray
/// [`LargeStringArray`]: crate::LargeStringArray
/// [`BinaryArray`]: crate::BinaryArray
/// [`LargeBinaryArray`]: crate::LargeBinaryArray
pub struct GenericByteArray<T: ByteArrayType> {
data_type: DataType,
value_offsets: OffsetBuffer<T::Offset>,
value_data: Buffer,
nulls: Option<NullBuffer>,
}
impl<T: ByteArrayType> Clone for GenericByteArray<T> {
fn clone(&self) -> Self {
Self {
data_type: T::DATA_TYPE,
value_offsets: self.value_offsets.clone(),
value_data: self.value_data.clone(),
nulls: self.nulls.clone(),
}
}
}
impl<T: ByteArrayType> GenericByteArray<T> {
/// Data type of the array.
pub const DATA_TYPE: DataType = T::DATA_TYPE;
/// Create a new [`GenericByteArray`] from the provided parts, panicking on failure
///
/// # Panics
///
/// Panics if [`GenericByteArray::try_new`] returns an error
pub fn new(
offsets: OffsetBuffer<T::Offset>,
values: Buffer,
nulls: Option<NullBuffer>,
) -> Self {
Self::try_new(offsets, values, nulls).unwrap()
}
/// Create a new [`GenericByteArray`] from the provided parts, returning an error on failure
///
/// # Errors
///
/// * `offsets.len() - 1 != nulls.len()`
/// * Any consecutive pair of `offsets` does not denote a valid slice of `values`
pub fn try_new(
offsets: OffsetBuffer<T::Offset>,
values: Buffer,
nulls: Option<NullBuffer>,
) -> Result<Self, ArrowError> {
let len = offsets.len() - 1;
// Verify that each pair of offsets is a valid slices of values
T::validate(&offsets, &values)?;
if let Some(n) = nulls.as_ref() {
if n.len() != len {
return Err(ArrowError::InvalidArgumentError(format!(
"Incorrect length of null buffer for {}{}Array, expected {len} got {}",
T::Offset::PREFIX,
T::PREFIX,
n.len(),
)));
}
}
Ok(Self {
data_type: T::DATA_TYPE,
value_offsets: offsets,
value_data: values,
nulls,
})
}
/// Create a new [`GenericByteArray`] from the provided parts, without validation
///
/// # Safety
///
/// Safe if [`Self::try_new`] would not error
pub unsafe fn new_unchecked(
offsets: OffsetBuffer<T::Offset>,
values: Buffer,
nulls: Option<NullBuffer>,
) -> Self {
Self {
data_type: T::DATA_TYPE,
value_offsets: offsets,
value_data: values,
nulls,
}
}
/// Create a new [`GenericByteArray`] of length `len` where all values are null
pub fn new_null(len: usize) -> Self {
Self {
data_type: T::DATA_TYPE,
value_offsets: OffsetBuffer::new_zeroed(len),
value_data: MutableBuffer::new(0).into(),
nulls: Some(NullBuffer::new_null(len)),
}
}
/// Create a new [`Scalar`] from `v`
pub fn new_scalar(value: impl AsRef<T::Native>) -> Scalar<Self> {
Scalar::new(Self::from_iter_values(std::iter::once(value)))
}
/// Creates a [`GenericByteArray`] based on an iterator of values without nulls
pub fn from_iter_values<Ptr, I>(iter: I) -> Self
where
Ptr: AsRef<T::Native>,
I: IntoIterator<Item = Ptr>,
{
let iter = iter.into_iter();
let (_, data_len) = iter.size_hint();
let data_len = data_len.expect("Iterator must be sized"); // panic if no upper bound.
let mut offsets = MutableBuffer::new((data_len + 1) * std::mem::size_of::<T::Offset>());
offsets.push(T::Offset::usize_as(0));
let mut values = MutableBuffer::new(0);
for s in iter {
let s: &[u8] = s.as_ref().as_ref();
values.extend_from_slice(s);
offsets.push(T::Offset::usize_as(values.len()));
}
T::Offset::from_usize(values.len()).expect("offset overflow");
let offsets = Buffer::from(offsets);
// Safety: valid by construction
let value_offsets = unsafe { OffsetBuffer::new_unchecked(offsets.into()) };
Self {
data_type: T::DATA_TYPE,
value_data: values.into(),
value_offsets,
nulls: None,
}
}
/// Deconstruct this array into its constituent parts
pub fn into_parts(self) -> (OffsetBuffer<T::Offset>, Buffer, Option<NullBuffer>) {
(self.value_offsets, self.value_data, self.nulls)
}
/// Returns the length for value at index `i`.
/// # Panics
/// Panics if index `i` is out of bounds.
#[inline]
pub fn value_length(&self, i: usize) -> T::Offset {
let offsets = self.value_offsets();
offsets[i + 1] - offsets[i]
}
/// Returns a reference to the offsets of this array
///
/// Unlike [`Self::value_offsets`] this returns the [`OffsetBuffer`]
/// allowing for zero-copy cloning
#[inline]
pub fn offsets(&self) -> &OffsetBuffer<T::Offset> {
&self.value_offsets
}
/// Returns the values of this array
///
/// Unlike [`Self::value_data`] this returns the [`Buffer`]
/// allowing for zero-copy cloning
#[inline]
pub fn values(&self) -> &Buffer {
&self.value_data
}
/// Returns the raw value data
pub fn value_data(&self) -> &[u8] {
self.value_data.as_slice()
}
/// Returns true if all data within this array is ASCII
pub fn is_ascii(&self) -> bool {
let offsets = self.value_offsets();
let start = offsets.first().unwrap();
let end = offsets.last().unwrap();
self.value_data()[start.as_usize()..end.as_usize()].is_ascii()
}
/// Returns the offset values in the offsets buffer
#[inline]
pub fn value_offsets(&self) -> &[T::Offset] {
&self.value_offsets
}
/// Returns the element at index `i`
/// # Safety
/// Caller is responsible for ensuring that the index is within the bounds of the array
pub unsafe fn value_unchecked(&self, i: usize) -> &T::Native {
let end = *self.value_offsets().get_unchecked(i + 1);
let start = *self.value_offsets().get_unchecked(i);
// Soundness
// pointer alignment & location is ensured by RawPtrBox
// buffer bounds/offset is ensured by the value_offset invariants
// Safety of `to_isize().unwrap()`
// `start` and `end` are &OffsetSize, which is a generic type that implements the
// OffsetSizeTrait. Currently, only i32 and i64 implement OffsetSizeTrait,
// both of which should cleanly cast to isize on an architecture that supports
// 32/64-bit offsets
let b = std::slice::from_raw_parts(
self.value_data.as_ptr().offset(start.to_isize().unwrap()),
(end - start).to_usize().unwrap(),
);
// SAFETY:
// ArrayData is valid
T::Native::from_bytes_unchecked(b)
}
/// Returns the element at index `i`
/// # Panics
/// Panics if index `i` is out of bounds.
pub fn value(&self, i: usize) -> &T::Native {
assert!(
i < self.len(),
"Trying to access an element at index {} from a {}{}Array of length {}",
i,
T::Offset::PREFIX,
T::PREFIX,
self.len()
);
// SAFETY:
// Verified length above
unsafe { self.value_unchecked(i) }
}
/// constructs a new iterator
pub fn iter(&self) -> ArrayIter<&Self> {
ArrayIter::new(self)
}
/// Returns a zero-copy slice of this array with the indicated offset and length.
pub fn slice(&self, offset: usize, length: usize) -> Self {
Self {
data_type: T::DATA_TYPE,
value_offsets: self.value_offsets.slice(offset, length),
value_data: self.value_data.clone(),
nulls: self.nulls.as_ref().map(|n| n.slice(offset, length)),
}
}
/// Returns `GenericByteBuilder` of this byte array for mutating its values if the underlying
/// offset and data buffers are not shared by others.
pub fn into_builder(self) -> Result<GenericByteBuilder<T>, Self> {
let len = self.len();
let value_len = T::Offset::as_usize(self.value_offsets()[len] - self.value_offsets()[0]);
let data = self.into_data();
let null_bit_buffer = data.nulls().map(|b| b.inner().sliced());
let element_len = std::mem::size_of::<T::Offset>();
let offset_buffer = data.buffers()[0]
.slice_with_length(data.offset() * element_len, (len + 1) * element_len);
let element_len = std::mem::size_of::<u8>();
let value_buffer = data.buffers()[1]
.slice_with_length(data.offset() * element_len, value_len * element_len);
drop(data);
let try_mutable_null_buffer = match null_bit_buffer {
None => Ok(None),
Some(null_buffer) => {
// Null buffer exists, tries to make it mutable
null_buffer.into_mutable().map(Some)
}
};
let try_mutable_buffers = match try_mutable_null_buffer {
Ok(mutable_null_buffer) => {
// Got mutable null buffer, tries to get mutable value buffer
let try_mutable_offset_buffer = offset_buffer.into_mutable();
let try_mutable_value_buffer = value_buffer.into_mutable();
// try_mutable_offset_buffer.map(...).map_err(...) doesn't work as the compiler complains
// mutable_null_buffer is moved into map closure.
match (try_mutable_offset_buffer, try_mutable_value_buffer) {
(Ok(mutable_offset_buffer), Ok(mutable_value_buffer)) => unsafe {
Ok(GenericByteBuilder::<T>::new_from_buffer(
mutable_offset_buffer,
mutable_value_buffer,
mutable_null_buffer,
))
},
(Ok(mutable_offset_buffer), Err(value_buffer)) => Err((
mutable_offset_buffer.into(),
value_buffer,
mutable_null_buffer.map(|b| b.into()),
)),
(Err(offset_buffer), Ok(mutable_value_buffer)) => Err((
offset_buffer,
mutable_value_buffer.into(),
mutable_null_buffer.map(|b| b.into()),
)),
(Err(offset_buffer), Err(value_buffer)) => Err((
offset_buffer,
value_buffer,
mutable_null_buffer.map(|b| b.into()),
)),
}
}
Err(mutable_null_buffer) => {
// Unable to get mutable null buffer
Err((offset_buffer, value_buffer, Some(mutable_null_buffer)))
}
};
match try_mutable_buffers {
Ok(builder) => Ok(builder),
Err((offset_buffer, value_buffer, null_bit_buffer)) => {
let builder = ArrayData::builder(T::DATA_TYPE)
.len(len)
.add_buffer(offset_buffer)
.add_buffer(value_buffer)
.null_bit_buffer(null_bit_buffer);
let array_data = unsafe { builder.build_unchecked() };
let array = GenericByteArray::<T>::from(array_data);
Err(array)
}
}
}
}
impl<T: ByteArrayType> std::fmt::Debug for GenericByteArray<T> {
fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(f, "{}{}Array\n[\n", T::Offset::PREFIX, T::PREFIX)?;
print_long_array(self, f, |array, index, f| {
std::fmt::Debug::fmt(&array.value(index), f)
})?;
write!(f, "]")
}
}
impl<T: ByteArrayType> Array for GenericByteArray<T> {
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.value_offsets.len() - 1
}
fn is_empty(&self) -> bool {
self.value_offsets.len() <= 1
}
fn offset(&self) -> usize {
0
}
fn nulls(&self) -> Option<&NullBuffer> {
self.nulls.as_ref()
}
fn get_buffer_memory_size(&self) -> usize {
let mut sum = self.value_offsets.inner().inner().capacity();
sum += self.value_data.capacity();
if let Some(x) = &self.nulls {
sum += x.buffer().capacity()
}
sum
}
fn get_array_memory_size(&self) -> usize {
std::mem::size_of::<Self>() + self.get_buffer_memory_size()
}
}
impl<'a, T: ByteArrayType> ArrayAccessor for &'a GenericByteArray<T> {
type Item = &'a T::Native;
fn value(&self, index: usize) -> Self::Item {
GenericByteArray::value(self, index)
}
unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
GenericByteArray::value_unchecked(self, index)
}
}
impl<T: ByteArrayType> From<ArrayData> for GenericByteArray<T> {
fn from(data: ArrayData) -> Self {
assert_eq!(
data.data_type(),
&Self::DATA_TYPE,
"{}{}Array expects DataType::{}",
T::Offset::PREFIX,
T::PREFIX,
Self::DATA_TYPE
);
assert_eq!(
data.buffers().len(),
2,
"{}{}Array data should contain 2 buffers only (offsets and values)",
T::Offset::PREFIX,
T::PREFIX,
);
// SAFETY:
// ArrayData is valid, and verified type above
let value_offsets = unsafe { get_offsets(&data) };
let value_data = data.buffers()[1].clone();
Self {
value_offsets,
value_data,
data_type: T::DATA_TYPE,
nulls: data.nulls().cloned(),
}
}
}
impl<T: ByteArrayType> From<GenericByteArray<T>> for ArrayData {
fn from(array: GenericByteArray<T>) -> Self {
let len = array.len();
let offsets = array.value_offsets.into_inner().into_inner();
let builder = ArrayDataBuilder::new(array.data_type)
.len(len)
.buffers(vec![offsets, array.value_data])
.nulls(array.nulls);
unsafe { builder.build_unchecked() }
}
}
impl<'a, T: ByteArrayType> IntoIterator for &'a GenericByteArray<T> {
type Item = Option<&'a T::Native>;
type IntoIter = ArrayIter<Self>;
fn into_iter(self) -> Self::IntoIter {
ArrayIter::new(self)
}
}
impl<'a, Ptr, T: ByteArrayType> FromIterator<&'a Option<Ptr>> for GenericByteArray<T>
where
Ptr: AsRef<T::Native> + 'a,
{
fn from_iter<I: IntoIterator<Item = &'a Option<Ptr>>>(iter: I) -> Self {
iter.into_iter()
.map(|o| o.as_ref().map(|p| p.as_ref()))
.collect()
}
}
impl<Ptr, T: ByteArrayType> FromIterator<Option<Ptr>> for GenericByteArray<T>
where
Ptr: AsRef<T::Native>,
{
fn from_iter<I: IntoIterator<Item = Option<Ptr>>>(iter: I) -> Self {
let iter = iter.into_iter();
let mut builder = GenericByteBuilder::with_capacity(iter.size_hint().0, 1024);
builder.extend(iter);
builder.finish()
}
}
#[cfg(test)]
mod tests {
use crate::{BinaryArray, StringArray};
use arrow_buffer::{Buffer, NullBuffer, OffsetBuffer};
#[test]
fn try_new() {
let data = Buffer::from_slice_ref("helloworld");
let offsets = OffsetBuffer::new(vec![0, 5, 10].into());
StringArray::new(offsets.clone(), data.clone(), None);
let nulls = NullBuffer::new_null(3);
let err =
StringArray::try_new(offsets.clone(), data.clone(), Some(nulls.clone())).unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: Incorrect length of null buffer for StringArray, expected 2 got 3");
let err = BinaryArray::try_new(offsets.clone(), data.clone(), Some(nulls)).unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: Incorrect length of null buffer for BinaryArray, expected 2 got 3");
let non_utf8_data = Buffer::from_slice_ref(b"he\xFFloworld");
let err = StringArray::try_new(offsets.clone(), non_utf8_data.clone(), None).unwrap_err();
assert_eq!(err.to_string(), "Invalid argument error: Encountered non UTF-8 data: invalid utf-8 sequence of 1 bytes from index 2");
BinaryArray::new(offsets, non_utf8_data, None);
let offsets = OffsetBuffer::new(vec![0, 5, 11].into());
let err = StringArray::try_new(offsets.clone(), data.clone(), None).unwrap_err();
assert_eq!(
err.to_string(),
"Invalid argument error: Offset of 11 exceeds length of values 10"
);
let err = BinaryArray::try_new(offsets.clone(), data, None).unwrap_err();
assert_eq!(
err.to_string(),
"Invalid argument error: Maximum offset of 11 is larger than values of length 10"
);
let non_ascii_data = Buffer::from_slice_ref("heìloworld");
StringArray::new(offsets.clone(), non_ascii_data.clone(), None);
BinaryArray::new(offsets, non_ascii_data.clone(), None);
let offsets = OffsetBuffer::new(vec![0, 3, 10].into());
let err = StringArray::try_new(offsets.clone(), non_ascii_data.clone(), None).unwrap_err();
assert_eq!(
err.to_string(),
"Invalid argument error: Split UTF-8 codepoint at offset 3"
);
BinaryArray::new(offsets, non_ascii_data, None);
}
}