arrow_array/array/
list_array.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
3// distributed with this work for additional information
4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
6// "License"); you may not use this file except in compliance
7// with the License.  You may obtain a copy of the License at
8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
11// Unless required by applicable law or agreed to in writing,
12// software distributed under the License is distributed on an
13// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
14// KIND, either express or implied.  See the License for the
15// specific language governing permissions and limitations
16// under the License.
17
18use crate::array::{get_offsets, make_array, print_long_array};
19use crate::builder::{GenericListBuilder, PrimitiveBuilder};
20use crate::{
21    Array, ArrayAccessor, ArrayRef, ArrowPrimitiveType, FixedSizeListArray,
22    iterator::GenericListArrayIter, new_empty_array,
23};
24use arrow_buffer::{ArrowNativeType, NullBuffer, OffsetBuffer};
25use arrow_data::{ArrayData, ArrayDataBuilder};
26use arrow_schema::{ArrowError, DataType, FieldRef};
27use num_integer::Integer;
28use std::any::Any;
29use std::sync::Arc;
30
31/// A type that can be used within a variable-size array to encode offset information
32///
33/// See [`ListArray`], [`LargeListArray`], [`BinaryArray`], [`LargeBinaryArray`],
34/// [`StringArray`] and [`LargeStringArray`]
35///
36/// [`BinaryArray`]: crate::array::BinaryArray
37/// [`LargeBinaryArray`]: crate::array::LargeBinaryArray
38/// [`StringArray`]: crate::array::StringArray
39/// [`LargeStringArray`]: crate::array::LargeStringArray
40pub trait OffsetSizeTrait:
41    ArrowNativeType + std::ops::AddAssign + Integer + num_traits::CheckedAdd
42{
43    /// True for 64 bit offset size and false for 32 bit offset size
44    const IS_LARGE: bool;
45    /// Prefix for the offset size
46    const PREFIX: &'static str;
47    /// The max `usize` offset
48    const MAX_OFFSET: usize;
49}
50
51impl OffsetSizeTrait for i32 {
52    const IS_LARGE: bool = false;
53    const PREFIX: &'static str = "";
54    const MAX_OFFSET: usize = i32::MAX as usize;
55}
56
57impl OffsetSizeTrait for i64 {
58    const IS_LARGE: bool = true;
59    const PREFIX: &'static str = "Large";
60    const MAX_OFFSET: usize = i64::MAX as usize;
61}
62
63/// An array of [variable length lists], similar to JSON arrays
64/// (e.g. `["A", "B", "C"]`). This struct specifically represents
65/// the [list layout]. Refer to [`GenericListViewArray`] for the
66/// [list-view layout].
67///
68/// Lists are represented using `offsets` into a `values` child
69/// array. Offsets are stored in two adjacent entries of an
70/// [`OffsetBuffer`].
71///
72/// Arrow defines [`ListArray`] with `i32` offsets and
73/// [`LargeListArray`] with `i64` offsets.
74///
75/// Use [`GenericListBuilder`] to construct a [`GenericListArray`].
76///
77/// # Representation
78///
79/// A [`ListArray`] can represent a list of values of any other
80/// supported Arrow type. Each element of the `ListArray` itself is
81/// a list which may be empty, may contain NULL and non-null values,
82/// or may itself be NULL.
83///
84/// For example, the `ListArray` shown in the following diagram stores
85/// lists of strings. Note that `[]` represents an empty (length
86/// 0), but non NULL list.
87///
88/// ```text
89/// ┌─────────────┐
90/// │   [A,B,C]   │
91/// ├─────────────┤
92/// │     []      │
93/// ├─────────────┤
94/// │    NULL     │
95/// ├─────────────┤
96/// │     [D]     │
97/// ├─────────────┤
98/// │  [NULL, F]  │
99/// └─────────────┘
100/// ```
101///
102/// The `values` are stored in a child [`StringArray`] and the offsets
103/// are stored in an [`OffsetBuffer`] as shown in the following
104/// diagram. The logical values and offsets are shown on the left, and
105/// the actual `ListArray` encoding on the right.
106///
107/// ```text
108///                                         ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─
109///                                                                 ┌ ─ ─ ─ ─ ─ ─ ┐    │
110///  ┌─────────────┐  ┌───────┐             │     ┌───┐   ┌───┐       ┌───┐ ┌───┐
111///  │   [A,B,C]   │  │ (0,3) │                   │ 1 │   │ 0 │     │ │ 1 │ │ A │ │ 0  │
112///  ├─────────────┤  ├───────┤             │     ├───┤   ├───┤       ├───┤ ├───┤
113///  │      []     │  │ (3,3) │                   │ 1 │   │ 3 │     │ │ 1 │ │ B │ │ 1  │
114///  ├─────────────┤  ├───────┤             │     ├───┤   ├───┤       ├───┤ ├───┤
115///  │    NULL     │  │ (3,4) │                   │ 0 │   │ 3 │     │ │ 1 │ │ C │ │ 2  │
116///  ├─────────────┤  ├───────┤             │     ├───┤   ├───┤       ├───┤ ├───┤
117///  │     [D]     │  │ (4,5) │                   │ 1 │   │ 4 │     │ │ ? │ │ ? │ │ 3  │
118///  ├─────────────┤  ├───────┤             │     ├───┤   ├───┤       ├───┤ ├───┤
119///  │  [NULL, F]  │  │ (5,7) │                   │ 1 │   │ 5 │     │ │ 1 │ │ D │ │ 4  │
120///  └─────────────┘  └───────┘             │     └───┘   ├───┤       ├───┤ ├───┤
121///                                                       │ 7 │     │ │ 0 │ │ ? │ │ 5  │
122///                                         │  Validity   └───┘       ├───┤ ├───┤
123///     Logical       Logical                  (nulls)   Offsets    │ │ 1 │ │ F │ │ 6  │
124///      Values       Offsets               │                         └───┘ └───┘
125///                                                                 │    Values   │    │
126///                 (offsets[i],            │   ListArray               (Array)
127///                offsets[i+1])                                    └ ─ ─ ─ ─ ─ ─ ┘    │
128///                                         └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─
129/// ```
130///
131/// # Slicing
132///
133/// Slicing a `ListArray` creates a new `ListArray` without copying any data,
134/// but this means the [`Self::values`] and [`Self::offsets`] may have "unused" data
135///
136/// For example, calling `slice(1, 3)` on the `ListArray` in the above example
137/// would result in the following. Note
138///
139/// 1. `Values` array is unchanged
140/// 2. `Offsets` do not start at `0`, nor cover all values in the Values array.
141///
142/// ```text
143///                                 ┌ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─
144///                                                         ┌ ─ ─ ─ ─ ─ ─ ┐    │  ╔═══╗
145///                                 │                         ╔═══╗ ╔═══╗         ║   ║  Not used
146///                                                         │ ║ 1 ║ ║ A ║ │ 0  │  ╚═══╝
147///  ┌─────────────┐  ┌───────┐     │     ┌───┐   ┌───┐       ╠═══╣ ╠═══╣
148///  │ [] (empty)  │  │ (3,3) │           │ 1 │   │ 3 │     │ ║ 1 ║ ║ B ║ │ 1  │
149///  ├─────────────┤  ├───────┤     │     ├───┤   ├───┤       ╠═══╣ ╠═══╣
150///  │    NULL     │  │ (3,4) │           │ 0 │   │ 3 │     │ ║ 1 ║ ║ C ║ │ 2  │
151///  ├─────────────┤  ├───────┤     │     ├───┤   ├───┤       ╠───╣ ╠───╣
152///  │     [D]     │  │ (4,5) │           │ 1 │   │ 4 │     │ │ 0 │ │ ? │ │ 3  │
153///  └─────────────┘  └───────┘     │     └───┘   ├───┤       ├───┤ ├───┤
154///                                               │ 5 │     │ │ 1 │ │ D │ │ 4  │
155///                                 │             └───┘       ├───┤ ├───┤
156///                                                         │ │ 0 │ │ ? │ │ 5  │
157///                                 │  Validity               ╠═══╣ ╠═══╣
158///     Logical       Logical          (nulls)   Offsets    │ ║ 1 ║ ║ F ║ │ 6  │
159///      Values       Offsets       │                         ╚═══╝ ╚═══╝
160///                                                         │    Values   │    │
161///                 (offsets[i],    │   ListArray               (Array)
162///                offsets[i+1])                            └ ─ ─ ─ ─ ─ ─ ┘    │
163///                                 └ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─ ─
164/// ```
165///
166/// [`StringArray`]: crate::array::StringArray
167/// [`GenericListViewArray`]: crate::array::GenericListViewArray
168/// [variable length lists]: https://arrow.apache.org/docs/format/Columnar.html#variable-size-list-layout
169/// [list layout]: https://arrow.apache.org/docs/format/Columnar.html#list-layout
170/// [list-view layout]: https://arrow.apache.org/docs/format/Columnar.html#listview-layout
171pub struct GenericListArray<OffsetSize: OffsetSizeTrait> {
172    data_type: DataType,
173    nulls: Option<NullBuffer>,
174    values: ArrayRef,
175    value_offsets: OffsetBuffer<OffsetSize>,
176}
177
178impl<OffsetSize: OffsetSizeTrait> Clone for GenericListArray<OffsetSize> {
179    fn clone(&self) -> Self {
180        Self {
181            data_type: self.data_type.clone(),
182            nulls: self.nulls.clone(),
183            values: self.values.clone(),
184            value_offsets: self.value_offsets.clone(),
185        }
186    }
187}
188
189impl<OffsetSize: OffsetSizeTrait> GenericListArray<OffsetSize> {
190    /// The data type constructor of list array.
191    /// The input is the schema of the child array and
192    /// the output is the [`DataType`], List or LargeList.
193    pub const DATA_TYPE_CONSTRUCTOR: fn(FieldRef) -> DataType = if OffsetSize::IS_LARGE {
194        DataType::LargeList
195    } else {
196        DataType::List
197    };
198
199    /// Create a new [`GenericListArray`] from the provided parts
200    ///
201    /// # Errors
202    ///
203    /// Errors if
204    ///
205    /// * `offsets.len() - 1 != nulls.len()`
206    /// * `offsets.last() > values.len()`
207    /// * `!field.is_nullable() && values.is_nullable()`
208    /// * `field.data_type() != values.data_type()`
209    pub fn try_new(
210        field: FieldRef,
211        offsets: OffsetBuffer<OffsetSize>,
212        values: ArrayRef,
213        nulls: Option<NullBuffer>,
214    ) -> Result<Self, ArrowError> {
215        let len = offsets.len() - 1; // Offsets guaranteed to not be empty
216        let end_offset = offsets.last().unwrap().as_usize();
217        // don't need to check other values of `offsets` because they are checked
218        // during construction of `OffsetBuffer`
219        if end_offset > values.len() {
220            return Err(ArrowError::InvalidArgumentError(format!(
221                "Max offset of {end_offset} exceeds length of values {}",
222                values.len()
223            )));
224        }
225
226        if let Some(n) = nulls.as_ref() {
227            if n.len() != len {
228                return Err(ArrowError::InvalidArgumentError(format!(
229                    "Incorrect length of null buffer for {}ListArray, expected {len} got {}",
230                    OffsetSize::PREFIX,
231                    n.len(),
232                )));
233            }
234        }
235        if !field.is_nullable() && values.is_nullable() {
236            return Err(ArrowError::InvalidArgumentError(format!(
237                "Non-nullable field of {}ListArray {:?} cannot contain nulls",
238                OffsetSize::PREFIX,
239                field.name()
240            )));
241        }
242
243        if field.data_type() != values.data_type() {
244            return Err(ArrowError::InvalidArgumentError(format!(
245                "{}ListArray expected data type {} got {} for {:?}",
246                OffsetSize::PREFIX,
247                field.data_type(),
248                values.data_type(),
249                field.name()
250            )));
251        }
252
253        Ok(Self {
254            data_type: Self::DATA_TYPE_CONSTRUCTOR(field),
255            nulls,
256            values,
257            value_offsets: offsets,
258        })
259    }
260
261    /// Create a new [`GenericListArray`] from the provided parts
262    ///
263    /// # Panics
264    ///
265    /// Panics if [`Self::try_new`] returns an error
266    pub fn new(
267        field: FieldRef,
268        offsets: OffsetBuffer<OffsetSize>,
269        values: ArrayRef,
270        nulls: Option<NullBuffer>,
271    ) -> Self {
272        Self::try_new(field, offsets, values, nulls).unwrap()
273    }
274
275    /// Create a new [`GenericListArray`] of length `len` where all values are null
276    pub fn new_null(field: FieldRef, len: usize) -> Self {
277        let values = new_empty_array(field.data_type());
278        Self {
279            data_type: Self::DATA_TYPE_CONSTRUCTOR(field),
280            nulls: Some(NullBuffer::new_null(len)),
281            value_offsets: OffsetBuffer::new_zeroed(len),
282            values,
283        }
284    }
285
286    /// Deconstruct this array into its constituent parts
287    pub fn into_parts(
288        self,
289    ) -> (
290        FieldRef,
291        OffsetBuffer<OffsetSize>,
292        ArrayRef,
293        Option<NullBuffer>,
294    ) {
295        let f = match self.data_type {
296            DataType::List(f) | DataType::LargeList(f) => f,
297            _ => unreachable!(),
298        };
299        (f, self.value_offsets, self.values, self.nulls)
300    }
301
302    /// Returns a reference to the offsets of this list
303    ///
304    /// Unlike [`Self::value_offsets`] this returns the [`OffsetBuffer`]
305    /// allowing for zero-copy cloning.
306    ///
307    /// Notes: The `offsets` may not start at 0 and may not cover all values in
308    /// [`Self::values`]. This can happen when the list array was sliced via
309    /// [`Self::slice`]. See documentation for [`Self`] for more details.
310    #[inline]
311    pub fn offsets(&self) -> &OffsetBuffer<OffsetSize> {
312        &self.value_offsets
313    }
314
315    /// Returns a reference to the values of this list
316    ///
317    /// Note: The list array may not refer to all values in the `values` array.
318    /// For example if the list array was sliced via [`Self::slice`] values will
319    /// still contain values both before and after the slice. See documentation
320    /// for [`Self`] for more details.
321    #[inline]
322    pub fn values(&self) -> &ArrayRef {
323        &self.values
324    }
325
326    /// Returns a clone of the value type of this list.
327    pub fn value_type(&self) -> DataType {
328        self.values.data_type().clone()
329    }
330
331    /// Returns ith value of this list array.
332    ///
333    /// Note: This method does not check for nulls and the value is arbitrary
334    /// if [`is_null`](Self::is_null) returns true for the index.
335    ///
336    /// # Safety
337    /// Caller must ensure that the index is within the array bounds
338    pub unsafe fn value_unchecked(&self, i: usize) -> ArrayRef {
339        let end = unsafe { self.value_offsets().get_unchecked(i + 1).as_usize() };
340        let start = unsafe { self.value_offsets().get_unchecked(i).as_usize() };
341        self.values.slice(start, end - start)
342    }
343
344    /// Returns ith value of this list array.
345    ///
346    /// Note: This method does not check for nulls and the value is arbitrary
347    /// (but still well-defined) if [`is_null`](Self::is_null) returns true for the index.
348    ///
349    /// # Panics
350    /// Panics if index `i` is out of bounds
351    pub fn value(&self, i: usize) -> ArrayRef {
352        let end = self.value_offsets()[i + 1].as_usize();
353        let start = self.value_offsets()[i].as_usize();
354        self.values.slice(start, end - start)
355    }
356
357    /// Returns the offset values in the offsets buffer.
358    ///
359    /// See [`Self::offsets`] for more details.
360    #[inline]
361    pub fn value_offsets(&self) -> &[OffsetSize] {
362        &self.value_offsets
363    }
364
365    /// Returns the length for value at index `i`.
366    #[inline]
367    pub fn value_length(&self, i: usize) -> OffsetSize {
368        let offsets = self.value_offsets();
369        offsets[i + 1] - offsets[i]
370    }
371
372    /// constructs a new iterator
373    pub fn iter<'a>(&'a self) -> GenericListArrayIter<'a, OffsetSize> {
374        GenericListArrayIter::<'a, OffsetSize>::new(self)
375    }
376
377    #[inline]
378    fn get_type(data_type: &DataType) -> Option<&DataType> {
379        match (OffsetSize::IS_LARGE, data_type) {
380            (true, DataType::LargeList(child)) | (false, DataType::List(child)) => {
381                Some(child.data_type())
382            }
383            _ => None,
384        }
385    }
386
387    /// Returns a zero-copy slice of this array with the indicated offset and length.
388    ///
389    /// Notes: this method does *NOT* slice the underlying values array or modify
390    /// the values in the offsets buffer. See [`Self::values`] and
391    /// [`Self::offsets`] for more information.
392    pub fn slice(&self, offset: usize, length: usize) -> Self {
393        Self {
394            data_type: self.data_type.clone(),
395            nulls: self.nulls.as_ref().map(|n| n.slice(offset, length)),
396            values: self.values.clone(),
397            value_offsets: self.value_offsets.slice(offset, length),
398        }
399    }
400
401    /// Creates a [`GenericListArray`] from an iterator of primitive values
402    /// # Example
403    /// ```
404    /// # use arrow_array::ListArray;
405    /// # use arrow_array::types::Int32Type;
406    ///
407    /// let data = vec![
408    ///    Some(vec![Some(0), Some(1), Some(2)]),
409    ///    None,
410    ///    Some(vec![Some(3), None, Some(5)]),
411    ///    Some(vec![Some(6), Some(7)]),
412    /// ];
413    /// let list_array = ListArray::from_iter_primitive::<Int32Type, _, _>(data);
414    /// println!("{:?}", list_array);
415    /// ```
416    pub fn from_iter_primitive<T, P, I>(iter: I) -> Self
417    where
418        T: ArrowPrimitiveType,
419        P: IntoIterator<Item = Option<<T as ArrowPrimitiveType>::Native>>,
420        I: IntoIterator<Item = Option<P>>,
421    {
422        let iter = iter.into_iter();
423        let size_hint = iter.size_hint().0;
424        let mut builder =
425            GenericListBuilder::with_capacity(PrimitiveBuilder::<T>::new(), size_hint);
426
427        for i in iter {
428            match i {
429                Some(p) => {
430                    for t in p {
431                        builder.values().append_option(t);
432                    }
433                    builder.append(true);
434                }
435                None => builder.append(false),
436            }
437        }
438        builder.finish()
439    }
440}
441
442impl<OffsetSize: OffsetSizeTrait> From<ArrayData> for GenericListArray<OffsetSize> {
443    fn from(data: ArrayData) -> Self {
444        Self::try_new_from_array_data(data)
445            .expect("Expected infallible creation of GenericListArray from ArrayDataRef failed")
446    }
447}
448
449impl<OffsetSize: OffsetSizeTrait> From<GenericListArray<OffsetSize>> for ArrayData {
450    fn from(array: GenericListArray<OffsetSize>) -> Self {
451        let len = array.len();
452        let builder = ArrayDataBuilder::new(array.data_type)
453            .len(len)
454            .nulls(array.nulls)
455            .buffers(vec![array.value_offsets.into_inner().into_inner()])
456            .child_data(vec![array.values.to_data()]);
457
458        unsafe { builder.build_unchecked() }
459    }
460}
461
462impl<OffsetSize: OffsetSizeTrait> From<FixedSizeListArray> for GenericListArray<OffsetSize> {
463    fn from(value: FixedSizeListArray) -> Self {
464        let (field, size) = match value.data_type() {
465            DataType::FixedSizeList(f, size) => (f, *size as usize),
466            _ => unreachable!(),
467        };
468
469        let offsets = OffsetBuffer::from_lengths(std::iter::repeat_n(size, value.len()));
470
471        Self {
472            data_type: Self::DATA_TYPE_CONSTRUCTOR(field.clone()),
473            nulls: value.nulls().cloned(),
474            values: value.values().clone(),
475            value_offsets: offsets,
476        }
477    }
478}
479
480impl<OffsetSize: OffsetSizeTrait> GenericListArray<OffsetSize> {
481    fn try_new_from_array_data(data: ArrayData) -> Result<Self, ArrowError> {
482        if data.buffers().len() != 1 {
483            return Err(ArrowError::InvalidArgumentError(format!(
484                "ListArray data should contain a single buffer only (value offsets), had {}",
485                data.buffers().len()
486            )));
487        }
488
489        if data.child_data().len() != 1 {
490            return Err(ArrowError::InvalidArgumentError(format!(
491                "ListArray should contain a single child array (values array), had {}",
492                data.child_data().len()
493            )));
494        }
495
496        let values = data.child_data()[0].clone();
497
498        if let Some(child_data_type) = Self::get_type(data.data_type()) {
499            if values.data_type() != child_data_type {
500                return Err(ArrowError::InvalidArgumentError(format!(
501                    "[Large]ListArray's child datatype {:?} does not \
502                             correspond to the List's datatype {:?}",
503                    values.data_type(),
504                    child_data_type
505                )));
506            }
507        } else {
508            return Err(ArrowError::InvalidArgumentError(format!(
509                "[Large]ListArray's datatype must be [Large]ListArray(). It is {:?}",
510                data.data_type()
511            )));
512        }
513
514        let values = make_array(values);
515        // SAFETY:
516        // ArrayData is valid, and verified type above
517        let value_offsets = unsafe { get_offsets(&data) };
518
519        Ok(Self {
520            data_type: data.data_type().clone(),
521            nulls: data.nulls().cloned(),
522            values,
523            value_offsets,
524        })
525    }
526}
527
528impl<OffsetSize: OffsetSizeTrait> Array for GenericListArray<OffsetSize> {
529    fn as_any(&self) -> &dyn Any {
530        self
531    }
532
533    fn to_data(&self) -> ArrayData {
534        self.clone().into()
535    }
536
537    fn into_data(self) -> ArrayData {
538        self.into()
539    }
540
541    fn data_type(&self) -> &DataType {
542        &self.data_type
543    }
544
545    fn slice(&self, offset: usize, length: usize) -> ArrayRef {
546        Arc::new(self.slice(offset, length))
547    }
548
549    fn len(&self) -> usize {
550        self.value_offsets.len() - 1
551    }
552
553    fn is_empty(&self) -> bool {
554        self.value_offsets.len() <= 1
555    }
556
557    fn shrink_to_fit(&mut self) {
558        if let Some(nulls) = &mut self.nulls {
559            nulls.shrink_to_fit();
560        }
561        self.values.shrink_to_fit();
562        self.value_offsets.shrink_to_fit();
563    }
564
565    fn offset(&self) -> usize {
566        0
567    }
568
569    fn nulls(&self) -> Option<&NullBuffer> {
570        self.nulls.as_ref()
571    }
572
573    fn logical_null_count(&self) -> usize {
574        // More efficient that the default implementation
575        self.null_count()
576    }
577
578    fn get_buffer_memory_size(&self) -> usize {
579        let mut size = self.values.get_buffer_memory_size();
580        size += self.value_offsets.inner().inner().capacity();
581        if let Some(n) = self.nulls.as_ref() {
582            size += n.buffer().capacity();
583        }
584        size
585    }
586
587    fn get_array_memory_size(&self) -> usize {
588        let mut size = std::mem::size_of::<Self>() + self.values.get_array_memory_size();
589        size += self.value_offsets.inner().inner().capacity();
590        if let Some(n) = self.nulls.as_ref() {
591            size += n.buffer().capacity();
592        }
593        size
594    }
595}
596
597impl<OffsetSize: OffsetSizeTrait> ArrayAccessor for &GenericListArray<OffsetSize> {
598    type Item = ArrayRef;
599
600    fn value(&self, index: usize) -> Self::Item {
601        GenericListArray::value(self, index)
602    }
603
604    unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
605        GenericListArray::value(self, index)
606    }
607}
608
609impl<OffsetSize: OffsetSizeTrait> std::fmt::Debug for GenericListArray<OffsetSize> {
610    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
611        let prefix = OffsetSize::PREFIX;
612
613        write!(f, "{prefix}ListArray\n[\n")?;
614        print_long_array(self, f, |array, index, f| {
615            std::fmt::Debug::fmt(&array.value(index), f)
616        })?;
617        write!(f, "]")
618    }
619}
620
621/// A [`GenericListArray`] of variable size lists, storing offsets as `i32`.
622///
623/// See [`ListBuilder`](crate::builder::ListBuilder) for how to construct a [`ListArray`]
624pub type ListArray = GenericListArray<i32>;
625
626/// A [`GenericListArray`] of variable size lists, storing offsets as `i64`.
627///
628/// See [`LargeListBuilder`](crate::builder::LargeListBuilder) for how to construct a [`LargeListArray`]
629pub type LargeListArray = GenericListArray<i64>;
630
631#[cfg(test)]
632mod tests {
633    use super::*;
634    use crate::builder::{FixedSizeListBuilder, Int32Builder, ListBuilder, UnionBuilder};
635    use crate::cast::AsArray;
636    use crate::types::Int32Type;
637    use crate::{Int32Array, Int64Array};
638    use arrow_buffer::{Buffer, ScalarBuffer, bit_util};
639    use arrow_schema::Field;
640
641    fn create_from_buffers() -> ListArray {
642        //  [[0, 1, 2], [3, 4, 5], [6, 7]]
643        let values = Int32Array::from(vec![0, 1, 2, 3, 4, 5, 6, 7]);
644        let offsets = OffsetBuffer::new(ScalarBuffer::from(vec![0, 3, 6, 8]));
645        let field = Arc::new(Field::new_list_field(DataType::Int32, true));
646        ListArray::new(field, offsets, Arc::new(values), None)
647    }
648
649    #[test]
650    fn test_from_iter_primitive() {
651        let data = vec![
652            Some(vec![Some(0), Some(1), Some(2)]),
653            Some(vec![Some(3), Some(4), Some(5)]),
654            Some(vec![Some(6), Some(7)]),
655        ];
656        let list_array = ListArray::from_iter_primitive::<Int32Type, _, _>(data);
657
658        let another = create_from_buffers();
659        assert_eq!(list_array, another)
660    }
661
662    #[test]
663    fn test_empty_list_array() {
664        // Construct an empty value array
665        let value_data = ArrayData::builder(DataType::Int32)
666            .len(0)
667            .add_buffer(Buffer::from([]))
668            .build()
669            .unwrap();
670
671        // Construct an empty offset buffer
672        let value_offsets = Buffer::from([]);
673
674        // Construct a list array from the above two
675        let list_data_type =
676            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
677        let list_data = ArrayData::builder(list_data_type)
678            .len(0)
679            .add_buffer(value_offsets)
680            .add_child_data(value_data)
681            .build()
682            .unwrap();
683
684        let list_array = ListArray::from(list_data);
685        assert_eq!(list_array.len(), 0)
686    }
687
688    #[test]
689    fn test_list_array() {
690        // Construct a value array
691        let value_data = ArrayData::builder(DataType::Int32)
692            .len(8)
693            .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7]))
694            .build()
695            .unwrap();
696
697        // Construct a buffer for value offsets, for the nested array:
698        //  [[0, 1, 2], [3, 4, 5], [6, 7]]
699        let value_offsets = Buffer::from_slice_ref([0, 3, 6, 8]);
700
701        // Construct a list array from the above two
702        let list_data_type =
703            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
704        let list_data = ArrayData::builder(list_data_type.clone())
705            .len(3)
706            .add_buffer(value_offsets.clone())
707            .add_child_data(value_data.clone())
708            .build()
709            .unwrap();
710        let list_array = ListArray::from(list_data);
711
712        let values = list_array.values();
713        assert_eq!(value_data, values.to_data());
714        assert_eq!(DataType::Int32, list_array.value_type());
715        assert_eq!(3, list_array.len());
716        assert_eq!(0, list_array.null_count());
717        assert_eq!(6, list_array.value_offsets()[2]);
718        assert_eq!(2, list_array.value_length(2));
719        assert_eq!(0, list_array.value(0).as_primitive::<Int32Type>().value(0));
720        assert_eq!(
721            0,
722            unsafe { list_array.value_unchecked(0) }
723                .as_primitive::<Int32Type>()
724                .value(0)
725        );
726        for i in 0..3 {
727            assert!(list_array.is_valid(i));
728            assert!(!list_array.is_null(i));
729        }
730
731        // Now test with a non-zero offset (skip first element)
732        //  [[3, 4, 5], [6, 7]]
733        let list_data = ArrayData::builder(list_data_type)
734            .len(2)
735            .offset(1)
736            .add_buffer(value_offsets)
737            .add_child_data(value_data.clone())
738            .build()
739            .unwrap();
740        let list_array = ListArray::from(list_data);
741
742        let values = list_array.values();
743        assert_eq!(value_data, values.to_data());
744        assert_eq!(DataType::Int32, list_array.value_type());
745        assert_eq!(2, list_array.len());
746        assert_eq!(0, list_array.null_count());
747        assert_eq!(6, list_array.value_offsets()[1]);
748        assert_eq!(2, list_array.value_length(1));
749        assert_eq!(3, list_array.value(0).as_primitive::<Int32Type>().value(0));
750        assert_eq!(
751            3,
752            unsafe { list_array.value_unchecked(0) }
753                .as_primitive::<Int32Type>()
754                .value(0)
755        );
756    }
757
758    #[test]
759    fn test_large_list_array() {
760        // Construct a value array
761        let value_data = ArrayData::builder(DataType::Int32)
762            .len(8)
763            .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7]))
764            .build()
765            .unwrap();
766
767        // Construct a buffer for value offsets, for the nested array:
768        //  [[0, 1, 2], [3, 4, 5], [6, 7]]
769        let value_offsets = Buffer::from_slice_ref([0i64, 3, 6, 8]);
770
771        // Construct a list array from the above two
772        let list_data_type = DataType::new_large_list(DataType::Int32, false);
773        let list_data = ArrayData::builder(list_data_type.clone())
774            .len(3)
775            .add_buffer(value_offsets.clone())
776            .add_child_data(value_data.clone())
777            .build()
778            .unwrap();
779        let list_array = LargeListArray::from(list_data);
780
781        let values = list_array.values();
782        assert_eq!(value_data, values.to_data());
783        assert_eq!(DataType::Int32, list_array.value_type());
784        assert_eq!(3, list_array.len());
785        assert_eq!(0, list_array.null_count());
786        assert_eq!(6, list_array.value_offsets()[2]);
787        assert_eq!(2, list_array.value_length(2));
788        assert_eq!(0, list_array.value(0).as_primitive::<Int32Type>().value(0));
789        assert_eq!(
790            0,
791            unsafe { list_array.value_unchecked(0) }
792                .as_primitive::<Int32Type>()
793                .value(0)
794        );
795        for i in 0..3 {
796            assert!(list_array.is_valid(i));
797            assert!(!list_array.is_null(i));
798        }
799
800        // Now test with a non-zero offset
801        //  [[3, 4, 5], [6, 7]]
802        let list_data = ArrayData::builder(list_data_type)
803            .len(2)
804            .offset(1)
805            .add_buffer(value_offsets)
806            .add_child_data(value_data.clone())
807            .build()
808            .unwrap();
809        let list_array = LargeListArray::from(list_data);
810
811        let values = list_array.values();
812        assert_eq!(value_data, values.to_data());
813        assert_eq!(DataType::Int32, list_array.value_type());
814        assert_eq!(2, list_array.len());
815        assert_eq!(0, list_array.null_count());
816        assert_eq!(6, list_array.value_offsets()[1]);
817        assert_eq!(2, list_array.value_length(1));
818        assert_eq!(3, list_array.value(0).as_primitive::<Int32Type>().value(0));
819        assert_eq!(
820            3,
821            unsafe { list_array.value_unchecked(0) }
822                .as_primitive::<Int32Type>()
823                .value(0)
824        );
825    }
826
827    #[test]
828    fn test_list_array_slice() {
829        // Construct a value array
830        let value_data = ArrayData::builder(DataType::Int32)
831            .len(10)
832            .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
833            .build()
834            .unwrap();
835
836        // Construct a buffer for value offsets, for the nested array:
837        //  [[0, 1], null, null, [2, 3], [4, 5], null, [6, 7, 8], null, [9]]
838        let value_offsets = Buffer::from_slice_ref([0, 2, 2, 2, 4, 6, 6, 9, 9, 10]);
839        // 01011001 00000001
840        let mut null_bits: [u8; 2] = [0; 2];
841        bit_util::set_bit(&mut null_bits, 0);
842        bit_util::set_bit(&mut null_bits, 3);
843        bit_util::set_bit(&mut null_bits, 4);
844        bit_util::set_bit(&mut null_bits, 6);
845        bit_util::set_bit(&mut null_bits, 8);
846
847        // Construct a list array from the above two
848        let list_data_type =
849            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
850        let list_data = ArrayData::builder(list_data_type)
851            .len(9)
852            .add_buffer(value_offsets)
853            .add_child_data(value_data.clone())
854            .null_bit_buffer(Some(Buffer::from(null_bits)))
855            .build()
856            .unwrap();
857        let list_array = ListArray::from(list_data);
858
859        let values = list_array.values();
860        assert_eq!(value_data, values.to_data());
861        assert_eq!(DataType::Int32, list_array.value_type());
862        assert_eq!(9, list_array.len());
863        assert_eq!(4, list_array.null_count());
864        assert_eq!(2, list_array.value_offsets()[3]);
865        assert_eq!(2, list_array.value_length(3));
866
867        let sliced_array = list_array.slice(1, 6);
868        assert_eq!(6, sliced_array.len());
869        assert_eq!(3, sliced_array.null_count());
870
871        for i in 0..sliced_array.len() {
872            if bit_util::get_bit(&null_bits, 1 + i) {
873                assert!(sliced_array.is_valid(i));
874            } else {
875                assert!(sliced_array.is_null(i));
876            }
877        }
878
879        // Check offset and length for each non-null value.
880        let sliced_list_array = sliced_array.as_any().downcast_ref::<ListArray>().unwrap();
881        assert_eq!(2, sliced_list_array.value_offsets()[2]);
882        assert_eq!(2, sliced_list_array.value_length(2));
883        assert_eq!(4, sliced_list_array.value_offsets()[3]);
884        assert_eq!(2, sliced_list_array.value_length(3));
885        assert_eq!(6, sliced_list_array.value_offsets()[5]);
886        assert_eq!(3, sliced_list_array.value_length(5));
887    }
888
889    #[test]
890    fn test_large_list_array_slice() {
891        // Construct a value array
892        let value_data = ArrayData::builder(DataType::Int32)
893            .len(10)
894            .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
895            .build()
896            .unwrap();
897
898        // Construct a buffer for value offsets, for the nested array:
899        //  [[0, 1], null, null, [2, 3], [4, 5], null, [6, 7, 8], null, [9]]
900        let value_offsets = Buffer::from_slice_ref([0i64, 2, 2, 2, 4, 6, 6, 9, 9, 10]);
901        // 01011001 00000001
902        let mut null_bits: [u8; 2] = [0; 2];
903        bit_util::set_bit(&mut null_bits, 0);
904        bit_util::set_bit(&mut null_bits, 3);
905        bit_util::set_bit(&mut null_bits, 4);
906        bit_util::set_bit(&mut null_bits, 6);
907        bit_util::set_bit(&mut null_bits, 8);
908
909        // Construct a list array from the above two
910        let list_data_type = DataType::new_large_list(DataType::Int32, false);
911        let list_data = ArrayData::builder(list_data_type)
912            .len(9)
913            .add_buffer(value_offsets)
914            .add_child_data(value_data.clone())
915            .null_bit_buffer(Some(Buffer::from(null_bits)))
916            .build()
917            .unwrap();
918        let list_array = LargeListArray::from(list_data);
919
920        let values = list_array.values();
921        assert_eq!(value_data, values.to_data());
922        assert_eq!(DataType::Int32, list_array.value_type());
923        assert_eq!(9, list_array.len());
924        assert_eq!(4, list_array.null_count());
925        assert_eq!(2, list_array.value_offsets()[3]);
926        assert_eq!(2, list_array.value_length(3));
927
928        let sliced_array = list_array.slice(1, 6);
929        assert_eq!(6, sliced_array.len());
930        assert_eq!(3, sliced_array.null_count());
931
932        for i in 0..sliced_array.len() {
933            if bit_util::get_bit(&null_bits, 1 + i) {
934                assert!(sliced_array.is_valid(i));
935            } else {
936                assert!(sliced_array.is_null(i));
937            }
938        }
939
940        // Check offset and length for each non-null value.
941        let sliced_list_array = sliced_array
942            .as_any()
943            .downcast_ref::<LargeListArray>()
944            .unwrap();
945        assert_eq!(2, sliced_list_array.value_offsets()[2]);
946        assert_eq!(2, sliced_list_array.value_length(2));
947        assert_eq!(4, sliced_list_array.value_offsets()[3]);
948        assert_eq!(2, sliced_list_array.value_length(3));
949        assert_eq!(6, sliced_list_array.value_offsets()[5]);
950        assert_eq!(3, sliced_list_array.value_length(5));
951    }
952
953    #[test]
954    #[should_panic(expected = "index out of bounds: the len is 10 but the index is 11")]
955    fn test_list_array_index_out_of_bound() {
956        // Construct a value array
957        let value_data = ArrayData::builder(DataType::Int32)
958            .len(10)
959            .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]))
960            .build()
961            .unwrap();
962
963        // Construct a buffer for value offsets, for the nested array:
964        //  [[0, 1], null, null, [2, 3], [4, 5], null, [6, 7, 8], null, [9]]
965        let value_offsets = Buffer::from_slice_ref([0i64, 2, 2, 2, 4, 6, 6, 9, 9, 10]);
966        // 01011001 00000001
967        let mut null_bits: [u8; 2] = [0; 2];
968        bit_util::set_bit(&mut null_bits, 0);
969        bit_util::set_bit(&mut null_bits, 3);
970        bit_util::set_bit(&mut null_bits, 4);
971        bit_util::set_bit(&mut null_bits, 6);
972        bit_util::set_bit(&mut null_bits, 8);
973
974        // Construct a list array from the above two
975        let list_data_type = DataType::new_large_list(DataType::Int32, false);
976        let list_data = ArrayData::builder(list_data_type)
977            .len(9)
978            .add_buffer(value_offsets)
979            .add_child_data(value_data)
980            .null_bit_buffer(Some(Buffer::from(null_bits)))
981            .build()
982            .unwrap();
983        let list_array = LargeListArray::from(list_data);
984        assert_eq!(9, list_array.len());
985
986        list_array.value(10);
987    }
988    #[test]
989    #[should_panic(expected = "ListArray data should contain a single buffer only (value offsets)")]
990    // Different error messages, so skip for now
991    // https://github.com/apache/arrow-rs/issues/1545
992    #[cfg(not(feature = "force_validate"))]
993    fn test_list_array_invalid_buffer_len() {
994        let value_data = unsafe {
995            ArrayData::builder(DataType::Int32)
996                .len(8)
997                .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7]))
998                .build_unchecked()
999        };
1000        let list_data_type =
1001            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
1002        let list_data = unsafe {
1003            ArrayData::builder(list_data_type)
1004                .len(3)
1005                .add_child_data(value_data)
1006                .build_unchecked()
1007        };
1008        drop(ListArray::from(list_data));
1009    }
1010
1011    #[test]
1012    #[should_panic(expected = "ListArray should contain a single child array (values array)")]
1013    // Different error messages, so skip for now
1014    // https://github.com/apache/arrow-rs/issues/1545
1015    #[cfg(not(feature = "force_validate"))]
1016    fn test_list_array_invalid_child_array_len() {
1017        let value_offsets = Buffer::from_slice_ref([0, 2, 5, 7]);
1018        let list_data_type =
1019            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
1020        let list_data = unsafe {
1021            ArrayData::builder(list_data_type)
1022                .len(3)
1023                .add_buffer(value_offsets)
1024                .build_unchecked()
1025        };
1026        drop(ListArray::from(list_data));
1027    }
1028
1029    #[test]
1030    #[should_panic(expected = "[Large]ListArray's datatype must be [Large]ListArray(). It is List")]
1031    fn test_from_array_data_validation() {
1032        let mut builder = ListBuilder::new(Int32Builder::new());
1033        builder.values().append_value(1);
1034        builder.append(true);
1035        let array = builder.finish();
1036        let _ = LargeListArray::from(array.into_data());
1037    }
1038
1039    #[test]
1040    fn test_list_array_offsets_need_not_start_at_zero() {
1041        let value_data = ArrayData::builder(DataType::Int32)
1042            .len(8)
1043            .add_buffer(Buffer::from_slice_ref([0, 1, 2, 3, 4, 5, 6, 7]))
1044            .build()
1045            .unwrap();
1046
1047        let value_offsets = Buffer::from_slice_ref([2, 2, 5, 7]);
1048
1049        let list_data_type =
1050            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
1051        let list_data = ArrayData::builder(list_data_type)
1052            .len(3)
1053            .add_buffer(value_offsets)
1054            .add_child_data(value_data)
1055            .build()
1056            .unwrap();
1057
1058        let list_array = ListArray::from(list_data);
1059        assert_eq!(list_array.value_length(0), 0);
1060        assert_eq!(list_array.value_length(1), 3);
1061        assert_eq!(list_array.value_length(2), 2);
1062    }
1063
1064    #[test]
1065    #[should_panic(expected = "Memory pointer is not aligned with the specified scalar type")]
1066    // Different error messages, so skip for now
1067    // https://github.com/apache/arrow-rs/issues/1545
1068    #[cfg(not(feature = "force_validate"))]
1069    fn test_primitive_array_alignment() {
1070        let buf = Buffer::from_slice_ref([0_u64]);
1071        let buf2 = buf.slice(1);
1072        let array_data = unsafe {
1073            ArrayData::builder(DataType::Int32)
1074                .add_buffer(buf2)
1075                .build_unchecked()
1076        };
1077        drop(Int32Array::from(array_data));
1078    }
1079
1080    #[test]
1081    #[should_panic(expected = "Memory pointer is not aligned with the specified scalar type")]
1082    // Different error messages, so skip for now
1083    // https://github.com/apache/arrow-rs/issues/1545
1084    #[cfg(not(feature = "force_validate"))]
1085    fn test_list_array_alignment() {
1086        let buf = Buffer::from_slice_ref([0_u64]);
1087        let buf2 = buf.slice(1);
1088
1089        let values: [i32; 8] = [0; 8];
1090        let value_data = unsafe {
1091            ArrayData::builder(DataType::Int32)
1092                .add_buffer(Buffer::from_slice_ref(values))
1093                .build_unchecked()
1094        };
1095
1096        let list_data_type =
1097            DataType::List(Arc::new(Field::new_list_field(DataType::Int32, false)));
1098        let list_data = unsafe {
1099            ArrayData::builder(list_data_type)
1100                .add_buffer(buf2)
1101                .add_child_data(value_data)
1102                .build_unchecked()
1103        };
1104        drop(ListArray::from(list_data));
1105    }
1106
1107    #[test]
1108    fn list_array_equality() {
1109        // test scaffold
1110        fn do_comparison(
1111            lhs_data: Vec<Option<Vec<Option<i32>>>>,
1112            rhs_data: Vec<Option<Vec<Option<i32>>>>,
1113            should_equal: bool,
1114        ) {
1115            let lhs = ListArray::from_iter_primitive::<Int32Type, _, _>(lhs_data.clone());
1116            let rhs = ListArray::from_iter_primitive::<Int32Type, _, _>(rhs_data.clone());
1117            assert_eq!(lhs == rhs, should_equal);
1118
1119            let lhs = LargeListArray::from_iter_primitive::<Int32Type, _, _>(lhs_data);
1120            let rhs = LargeListArray::from_iter_primitive::<Int32Type, _, _>(rhs_data);
1121            assert_eq!(lhs == rhs, should_equal);
1122        }
1123
1124        do_comparison(
1125            vec![
1126                Some(vec![Some(0), Some(1), Some(2)]),
1127                None,
1128                Some(vec![Some(3), None, Some(5)]),
1129                Some(vec![Some(6), Some(7)]),
1130            ],
1131            vec![
1132                Some(vec![Some(0), Some(1), Some(2)]),
1133                None,
1134                Some(vec![Some(3), None, Some(5)]),
1135                Some(vec![Some(6), Some(7)]),
1136            ],
1137            true,
1138        );
1139
1140        do_comparison(
1141            vec![
1142                None,
1143                None,
1144                Some(vec![Some(3), None, Some(5)]),
1145                Some(vec![Some(6), Some(7)]),
1146            ],
1147            vec![
1148                Some(vec![Some(0), Some(1), Some(2)]),
1149                None,
1150                Some(vec![Some(3), None, Some(5)]),
1151                Some(vec![Some(6), Some(7)]),
1152            ],
1153            false,
1154        );
1155
1156        do_comparison(
1157            vec![
1158                None,
1159                None,
1160                Some(vec![Some(3), None, Some(5)]),
1161                Some(vec![Some(6), Some(7)]),
1162            ],
1163            vec![
1164                None,
1165                None,
1166                Some(vec![Some(3), None, Some(5)]),
1167                Some(vec![Some(0), Some(0)]),
1168            ],
1169            false,
1170        );
1171
1172        do_comparison(
1173            vec![None, None, Some(vec![Some(1)])],
1174            vec![None, None, Some(vec![Some(2)])],
1175            false,
1176        );
1177    }
1178
1179    #[test]
1180    fn test_empty_offsets() {
1181        let f = Arc::new(Field::new("element", DataType::Int32, true));
1182        let string = ListArray::from(
1183            ArrayData::builder(DataType::List(f.clone()))
1184                .buffers(vec![Buffer::from(&[])])
1185                .add_child_data(ArrayData::new_empty(&DataType::Int32))
1186                .build()
1187                .unwrap(),
1188        );
1189        assert_eq!(string.value_offsets(), &[0]);
1190        let string = LargeListArray::from(
1191            ArrayData::builder(DataType::LargeList(f))
1192                .buffers(vec![Buffer::from(&[])])
1193                .add_child_data(ArrayData::new_empty(&DataType::Int32))
1194                .build()
1195                .unwrap(),
1196        );
1197        assert_eq!(string.len(), 0);
1198        assert_eq!(string.value_offsets(), &[0]);
1199    }
1200
1201    #[test]
1202    fn test_try_new() {
1203        let offsets = OffsetBuffer::new(vec![0, 1, 4, 5].into());
1204        let values = Int32Array::new(vec![1, 2, 3, 4, 5].into(), None);
1205        let values = Arc::new(values) as ArrayRef;
1206
1207        let field = Arc::new(Field::new("element", DataType::Int32, false));
1208        ListArray::new(field.clone(), offsets.clone(), values.clone(), None);
1209
1210        let nulls = NullBuffer::new_null(3);
1211        ListArray::new(field.clone(), offsets, values.clone(), Some(nulls));
1212
1213        let nulls = NullBuffer::new_null(3);
1214        let offsets = OffsetBuffer::new(vec![0, 1, 2, 4, 5].into());
1215        let err = LargeListArray::try_new(field, offsets.clone(), values.clone(), Some(nulls))
1216            .unwrap_err();
1217
1218        assert_eq!(
1219            err.to_string(),
1220            "Invalid argument error: Incorrect length of null buffer for LargeListArray, expected 4 got 3"
1221        );
1222
1223        let field = Arc::new(Field::new("element", DataType::Int64, false));
1224        let err = LargeListArray::try_new(field.clone(), offsets.clone(), values.clone(), None)
1225            .unwrap_err();
1226
1227        assert_eq!(
1228            err.to_string(),
1229            "Invalid argument error: LargeListArray expected data type Int64 got Int32 for \"element\""
1230        );
1231
1232        let nulls = NullBuffer::new_null(7);
1233        let values = Int64Array::new(vec![0; 7].into(), Some(nulls));
1234        let values = Arc::new(values);
1235
1236        let err =
1237            LargeListArray::try_new(field, offsets.clone(), values.clone(), None).unwrap_err();
1238
1239        assert_eq!(
1240            err.to_string(),
1241            "Invalid argument error: Non-nullable field of LargeListArray \"element\" cannot contain nulls"
1242        );
1243
1244        let field = Arc::new(Field::new("element", DataType::Int64, true));
1245        LargeListArray::new(field.clone(), offsets.clone(), values, None);
1246
1247        let values = Int64Array::new(vec![0; 2].into(), None);
1248        let err = LargeListArray::try_new(field, offsets, Arc::new(values), None).unwrap_err();
1249
1250        assert_eq!(
1251            err.to_string(),
1252            "Invalid argument error: Max offset of 5 exceeds length of values 2"
1253        );
1254    }
1255
1256    #[test]
1257    fn test_from_fixed_size_list() {
1258        let mut builder = FixedSizeListBuilder::new(Int32Builder::new(), 3);
1259        builder.values().append_slice(&[1, 2, 3]);
1260        builder.append(true);
1261        builder.values().append_slice(&[0, 0, 0]);
1262        builder.append(false);
1263        builder.values().append_slice(&[4, 5, 6]);
1264        builder.append(true);
1265        let list: ListArray = builder.finish().into();
1266
1267        let values: Vec<_> = list
1268            .iter()
1269            .map(|x| x.map(|x| x.as_primitive::<Int32Type>().values().to_vec()))
1270            .collect();
1271        assert_eq!(values, vec![Some(vec![1, 2, 3]), None, Some(vec![4, 5, 6])])
1272    }
1273
1274    #[test]
1275    fn test_nullable_union() {
1276        let offsets = OffsetBuffer::new(vec![0, 1, 4, 5].into());
1277        let mut builder = UnionBuilder::new_dense();
1278        builder.append::<Int32Type>("a", 1).unwrap();
1279        builder.append::<Int32Type>("b", 2).unwrap();
1280        builder.append::<Int32Type>("b", 3).unwrap();
1281        builder.append::<Int32Type>("a", 4).unwrap();
1282        builder.append::<Int32Type>("a", 5).unwrap();
1283        let values = builder.build().unwrap();
1284        let field = Arc::new(Field::new("element", values.data_type().clone(), false));
1285        ListArray::new(field.clone(), offsets, Arc::new(values), None);
1286    }
1287}
arrow_array/array/list_array.rs

arrow_array/array/
list_array.rs
