arrow_array/array/
boolean_array.rs

1// Licensed to the Apache Software Foundation (ASF) under one
2// or more contributor license agreements.  See the NOTICE file
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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
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8//
9//   http://www.apache.org/licenses/LICENSE-2.0
10//
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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::print_long_array;
19use crate::builder::BooleanBuilder;
20use crate::iterator::BooleanIter;
21use crate::{Array, ArrayAccessor, ArrayRef, Scalar};
22use arrow_buffer::{BooleanBuffer, Buffer, MutableBuffer, NullBuffer, bit_util};
23use arrow_data::{ArrayData, ArrayDataBuilder};
24use arrow_schema::DataType;
25use std::any::Any;
26use std::sync::Arc;
27
28/// An array of [boolean values](https://arrow.apache.org/docs/format/Columnar.html#fixed-size-primitive-layout)
29///
30/// # Example: From a Vec
31///
32/// ```
33/// # use arrow_array::{Array, BooleanArray};
34/// let arr: BooleanArray = vec![true, true, false].into();
35/// ```
36///
37/// # Example: From an optional Vec
38///
39/// ```
40/// # use arrow_array::{Array, BooleanArray};
41/// let arr: BooleanArray = vec![Some(true), None, Some(false)].into();
42/// ```
43///
44/// # Example: From an iterator
45///
46/// ```
47/// # use arrow_array::{Array, BooleanArray};
48/// let arr: BooleanArray = (0..5).map(|x| (x % 2 == 0).then(|| x % 3 == 0)).collect();
49/// let values: Vec<_> = arr.iter().collect();
50/// assert_eq!(&values, &[Some(true), None, Some(false), None, Some(false)])
51/// ```
52///
53/// # Example: Using Builder
54///
55/// ```
56/// # use arrow_array::Array;
57/// # use arrow_array::builder::BooleanBuilder;
58/// let mut builder = BooleanBuilder::new();
59/// builder.append_value(true);
60/// builder.append_null();
61/// builder.append_value(false);
62/// let array = builder.finish();
63/// let values: Vec<_> = array.iter().collect();
64/// assert_eq!(&values, &[Some(true), None, Some(false)])
65/// ```
66///
67#[derive(Clone)]
68pub struct BooleanArray {
69    values: BooleanBuffer,
70    nulls: Option<NullBuffer>,
71}
72
73impl std::fmt::Debug for BooleanArray {
74    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
75        write!(f, "BooleanArray\n[\n")?;
76        print_long_array(self, f, |array, index, f| {
77            std::fmt::Debug::fmt(&array.value(index), f)
78        })?;
79        write!(f, "]")
80    }
81}
82
83impl BooleanArray {
84    /// Create a new [`BooleanArray`] from the provided values and nulls
85    ///
86    /// # Panics
87    ///
88    /// Panics if `values.len() != nulls.len()`
89    pub fn new(values: BooleanBuffer, nulls: Option<NullBuffer>) -> Self {
90        if let Some(n) = nulls.as_ref() {
91            assert_eq!(values.len(), n.len());
92        }
93        Self { values, nulls }
94    }
95
96    /// Create a new [`BooleanArray`] with length `len` consisting only of nulls
97    pub fn new_null(len: usize) -> Self {
98        Self {
99            values: BooleanBuffer::new_unset(len),
100            nulls: Some(NullBuffer::new_null(len)),
101        }
102    }
103
104    /// Create a new [`Scalar`] from `value`
105    pub fn new_scalar(value: bool) -> Scalar<Self> {
106        let values = match value {
107            true => BooleanBuffer::new_set(1),
108            false => BooleanBuffer::new_unset(1),
109        };
110        Scalar::new(Self::new(values, None))
111    }
112
113    /// Create a new [`BooleanArray`] from a [`Buffer`] specified by `offset` and `len`, the `offset` and `len` in bits
114    /// Logically convert each bit in [`Buffer`] to boolean and use it to build [`BooleanArray`].
115    /// using this method will make the following points self-evident:
116    /// * there is no `null` in the constructed [`BooleanArray`];
117    /// * without considering `buffer.into()`, this method is efficient because there is no need to perform pack and unpack operations on boolean;
118    pub fn new_from_packed(buffer: impl Into<Buffer>, offset: usize, len: usize) -> Self {
119        BooleanBuffer::new(buffer.into(), offset, len).into()
120    }
121
122    /// Create a new [`BooleanArray`] from `&[u8]`
123    /// This method uses `new_from_packed` and constructs a [`Buffer`] using `value`, and offset is set to 0 and len is set to `value.len() * 8`
124    /// using this method will make the following points self-evident:
125    /// * there is no `null` in the constructed [`BooleanArray`];
126    /// * the length of the constructed [`BooleanArray`] is always a multiple of 8;
127    pub fn new_from_u8(value: &[u8]) -> Self {
128        BooleanBuffer::new(Buffer::from(value), 0, value.len() * 8).into()
129    }
130
131    /// Returns the length of this array.
132    pub fn len(&self) -> usize {
133        self.values.len()
134    }
135
136    /// Returns whether this array is empty.
137    pub fn is_empty(&self) -> bool {
138        self.values.is_empty()
139    }
140
141    /// Returns a zero-copy slice of this array with the indicated offset and length.
142    pub fn slice(&self, offset: usize, length: usize) -> Self {
143        Self {
144            values: self.values.slice(offset, length),
145            nulls: self.nulls.as_ref().map(|n| n.slice(offset, length)),
146        }
147    }
148
149    /// Returns a new boolean array builder
150    pub fn builder(capacity: usize) -> BooleanBuilder {
151        BooleanBuilder::with_capacity(capacity)
152    }
153
154    /// Returns the underlying [`BooleanBuffer`] holding all the values of this array
155    pub fn values(&self) -> &BooleanBuffer {
156        &self.values
157    }
158
159    /// Returns the number of non null, true values within this array
160    pub fn true_count(&self) -> usize {
161        match self.nulls() {
162            Some(nulls) => {
163                let null_chunks = nulls.inner().bit_chunks().iter_padded();
164                let value_chunks = self.values().bit_chunks().iter_padded();
165                null_chunks
166                    .zip(value_chunks)
167                    .map(|(a, b)| (a & b).count_ones() as usize)
168                    .sum()
169            }
170            None => self.values().count_set_bits(),
171        }
172    }
173
174    /// Returns the number of non null, false values within this array
175    pub fn false_count(&self) -> usize {
176        self.len() - self.null_count() - self.true_count()
177    }
178
179    /// Returns the boolean value at index `i`.
180    ///
181    /// Note: This method does not check for nulls and the value is arbitrary
182    /// if [`is_null`](Self::is_null) returns true for the index.
183    ///
184    /// # Safety
185    /// This doesn't check bounds, the caller must ensure that index < self.len()
186    pub unsafe fn value_unchecked(&self, i: usize) -> bool {
187        unsafe { self.values.value_unchecked(i) }
188    }
189
190    /// Returns the boolean value at index `i`.
191    ///
192    /// Note: This method does not check for nulls and the value is arbitrary
193    /// if [`is_null`](Self::is_null) returns true for the index.
194    ///
195    /// # Panics
196    /// Panics if index `i` is out of bounds
197    pub fn value(&self, i: usize) -> bool {
198        assert!(
199            i < self.len(),
200            "Trying to access an element at index {} from a BooleanArray of length {}",
201            i,
202            self.len()
203        );
204        // Safety:
205        // `i < self.len()
206        unsafe { self.value_unchecked(i) }
207    }
208
209    /// Returns an iterator that returns the values of `array.value(i)` for an iterator with each element `i`
210    pub fn take_iter<'a>(
211        &'a self,
212        indexes: impl Iterator<Item = Option<usize>> + 'a,
213    ) -> impl Iterator<Item = Option<bool>> + 'a {
214        indexes.map(|opt_index| opt_index.map(|index| self.value(index)))
215    }
216
217    /// Returns an iterator that returns the values of `array.value(i)` for an iterator with each element `i`
218    /// # Safety
219    ///
220    /// caller must ensure that the offsets in the iterator are less than the array len()
221    pub unsafe fn take_iter_unchecked<'a>(
222        &'a self,
223        indexes: impl Iterator<Item = Option<usize>> + 'a,
224    ) -> impl Iterator<Item = Option<bool>> + 'a {
225        indexes.map(|opt_index| opt_index.map(|index| unsafe { self.value_unchecked(index) }))
226    }
227
228    /// Create a [`BooleanArray`] by evaluating the operation for
229    /// each element of the provided array
230    ///
231    /// ```
232    /// # use arrow_array::{BooleanArray, Int32Array};
233    ///
234    /// let array = Int32Array::from(vec![1, 2, 3, 4, 5]);
235    /// let r = BooleanArray::from_unary(&array, |x| x > 2);
236    /// assert_eq!(&r, &BooleanArray::from(vec![false, false, true, true, true]));
237    /// ```
238    pub fn from_unary<T: ArrayAccessor, F>(left: T, mut op: F) -> Self
239    where
240        F: FnMut(T::Item) -> bool,
241    {
242        let nulls = left.logical_nulls();
243        let values = BooleanBuffer::collect_bool(left.len(), |i| unsafe {
244            // SAFETY: i in range 0..len
245            op(left.value_unchecked(i))
246        });
247        Self::new(values, nulls)
248    }
249
250    /// Create a [`BooleanArray`] by evaluating the binary operation for
251    /// each element of the provided arrays
252    ///
253    /// ```
254    /// # use arrow_array::{BooleanArray, Int32Array};
255    ///
256    /// let a = Int32Array::from(vec![1, 2, 3, 4, 5]);
257    /// let b = Int32Array::from(vec![1, 2, 0, 2, 5]);
258    /// let r = BooleanArray::from_binary(&a, &b, |a, b| a == b);
259    /// assert_eq!(&r, &BooleanArray::from(vec![true, true, false, false, true]));
260    /// ```
261    ///
262    /// # Panics
263    ///
264    /// This function panics if left and right are not the same length
265    ///
266    pub fn from_binary<T: ArrayAccessor, S: ArrayAccessor, F>(left: T, right: S, mut op: F) -> Self
267    where
268        F: FnMut(T::Item, S::Item) -> bool,
269    {
270        assert_eq!(left.len(), right.len());
271
272        let nulls = NullBuffer::union(
273            left.logical_nulls().as_ref(),
274            right.logical_nulls().as_ref(),
275        );
276        let values = BooleanBuffer::collect_bool(left.len(), |i| unsafe {
277            // SAFETY: i in range 0..len
278            op(left.value_unchecked(i), right.value_unchecked(i))
279        });
280        Self::new(values, nulls)
281    }
282
283    /// Deconstruct this array into its constituent parts
284    pub fn into_parts(self) -> (BooleanBuffer, Option<NullBuffer>) {
285        (self.values, self.nulls)
286    }
287}
288
289impl super::private::Sealed for BooleanArray {}
290
291impl Array for BooleanArray {
292    fn as_any(&self) -> &dyn Any {
293        self
294    }
295
296    fn to_data(&self) -> ArrayData {
297        self.clone().into()
298    }
299
300    fn into_data(self) -> ArrayData {
301        self.into()
302    }
303
304    fn data_type(&self) -> &DataType {
305        &DataType::Boolean
306    }
307
308    fn slice(&self, offset: usize, length: usize) -> ArrayRef {
309        Arc::new(self.slice(offset, length))
310    }
311
312    fn len(&self) -> usize {
313        self.values.len()
314    }
315
316    fn is_empty(&self) -> bool {
317        self.values.is_empty()
318    }
319
320    fn shrink_to_fit(&mut self) {
321        self.values.shrink_to_fit();
322        if let Some(nulls) = &mut self.nulls {
323            nulls.shrink_to_fit();
324        }
325    }
326
327    fn offset(&self) -> usize {
328        self.values.offset()
329    }
330
331    fn nulls(&self) -> Option<&NullBuffer> {
332        self.nulls.as_ref()
333    }
334
335    fn logical_null_count(&self) -> usize {
336        self.null_count()
337    }
338
339    fn get_buffer_memory_size(&self) -> usize {
340        let mut sum = self.values.inner().capacity();
341        if let Some(x) = &self.nulls {
342            sum += x.buffer().capacity()
343        }
344        sum
345    }
346
347    fn get_array_memory_size(&self) -> usize {
348        std::mem::size_of::<Self>() + self.get_buffer_memory_size()
349    }
350}
351
352impl ArrayAccessor for &BooleanArray {
353    type Item = bool;
354
355    fn value(&self, index: usize) -> Self::Item {
356        BooleanArray::value(self, index)
357    }
358
359    unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
360        unsafe { BooleanArray::value_unchecked(self, index) }
361    }
362}
363
364impl From<Vec<bool>> for BooleanArray {
365    fn from(data: Vec<bool>) -> Self {
366        let mut mut_buf = MutableBuffer::new_null(data.len());
367        {
368            let mut_slice = mut_buf.as_slice_mut();
369            for (i, b) in data.iter().enumerate() {
370                if *b {
371                    bit_util::set_bit(mut_slice, i);
372                }
373            }
374        }
375        let array_data = ArrayData::builder(DataType::Boolean)
376            .len(data.len())
377            .add_buffer(mut_buf.into());
378
379        let array_data = unsafe { array_data.build_unchecked() };
380        BooleanArray::from(array_data)
381    }
382}
383
384impl From<Vec<Option<bool>>> for BooleanArray {
385    fn from(data: Vec<Option<bool>>) -> Self {
386        data.iter().collect()
387    }
388}
389
390impl From<ArrayData> for BooleanArray {
391    fn from(data: ArrayData) -> Self {
392        let (data_type, len, nulls, offset, mut buffers, _child_data) = data.into_parts();
393        assert_eq!(
394            data_type,
395            DataType::Boolean,
396            "BooleanArray expected ArrayData with type Boolean got {data_type:?}",
397        );
398        assert_eq!(
399            buffers.len(),
400            1,
401            "BooleanArray data should contain a single buffer only (values buffer)"
402        );
403        let buffer = buffers.pop().expect("checked above");
404        let values = BooleanBuffer::new(buffer, offset, len);
405
406        Self { values, nulls }
407    }
408}
409
410impl From<BooleanArray> for ArrayData {
411    fn from(array: BooleanArray) -> Self {
412        let builder = ArrayDataBuilder::new(DataType::Boolean)
413            .len(array.values.len())
414            .offset(array.values.offset())
415            .nulls(array.nulls)
416            .buffers(vec![array.values.into_inner()]);
417
418        unsafe { builder.build_unchecked() }
419    }
420}
421
422impl<'a> IntoIterator for &'a BooleanArray {
423    type Item = Option<bool>;
424    type IntoIter = BooleanIter<'a>;
425
426    fn into_iter(self) -> Self::IntoIter {
427        BooleanIter::<'a>::new(self)
428    }
429}
430
431impl<'a> BooleanArray {
432    /// constructs a new iterator
433    pub fn iter(&'a self) -> BooleanIter<'a> {
434        BooleanIter::<'a>::new(self)
435    }
436}
437
438/// An optional boolean value
439///
440/// This struct is used as an adapter when creating `BooleanArray` from an iterator.
441/// `FromIterator` for `BooleanArray` takes an iterator where the elements can be `into`
442/// this struct. So once implementing `From` or `Into` trait for a type, an iterator of
443/// the type can be collected to `BooleanArray`.
444///
445/// See also [NativeAdapter](crate::array::NativeAdapter).
446#[derive(Debug)]
447struct BooleanAdapter {
448    /// Corresponding Rust native type if available
449    pub native: Option<bool>,
450}
451
452impl From<bool> for BooleanAdapter {
453    fn from(value: bool) -> Self {
454        BooleanAdapter {
455            native: Some(value),
456        }
457    }
458}
459
460impl From<&bool> for BooleanAdapter {
461    fn from(value: &bool) -> Self {
462        BooleanAdapter {
463            native: Some(*value),
464        }
465    }
466}
467
468impl From<Option<bool>> for BooleanAdapter {
469    fn from(value: Option<bool>) -> Self {
470        BooleanAdapter { native: value }
471    }
472}
473
474impl From<&Option<bool>> for BooleanAdapter {
475    fn from(value: &Option<bool>) -> Self {
476        BooleanAdapter { native: *value }
477    }
478}
479
480impl<Ptr: Into<BooleanAdapter>> FromIterator<Ptr> for BooleanArray {
481    fn from_iter<I: IntoIterator<Item = Ptr>>(iter: I) -> Self {
482        let iter = iter.into_iter();
483        let capacity = match iter.size_hint() {
484            (lower, Some(upper)) if lower == upper => lower,
485            _ => 0,
486        };
487        let mut builder = BooleanBuilder::with_capacity(capacity);
488        builder.extend(iter.map(|item| item.into().native));
489        builder.finish()
490    }
491}
492
493impl BooleanArray {
494    /// Creates a [`BooleanArray`] from an iterator of trusted length.
495    ///
496    /// # Safety
497    ///
498    /// The iterator must be [`TrustedLen`](https://doc.rust-lang.org/std/iter/trait.TrustedLen.html).
499    /// I.e. that `size_hint().1` correctly reports its length. Note that this is a stronger
500    /// guarantee that `ExactSizeIterator` provides which could still report a wrong length.
501    ///
502    /// # Panics
503    ///
504    /// Panics if the iterator does not report an upper bound on `size_hint()`.
505    #[inline]
506    #[allow(
507        private_bounds,
508        reason = "We will expose BooleanAdapter if there is a need"
509    )]
510    pub unsafe fn from_trusted_len_iter<I, P>(iter: I) -> Self
511    where
512        P: Into<BooleanAdapter>,
513        I: ExactSizeIterator<Item = P>,
514    {
515        let data_len = iter.len();
516
517        let num_bytes = bit_util::ceil(data_len, 8);
518        let mut null_builder = MutableBuffer::from_len_zeroed(num_bytes);
519        let mut val_builder = MutableBuffer::from_len_zeroed(num_bytes);
520
521        let data = val_builder.as_slice_mut();
522
523        let null_slice = null_builder.as_slice_mut();
524        iter.enumerate().for_each(|(i, item)| {
525            if let Some(a) = item.into().native {
526                unsafe {
527                    // SAFETY: There will be enough space in the buffers due to the trusted len size
528                    // hint
529                    bit_util::set_bit_raw(null_slice.as_mut_ptr(), i);
530                    if a {
531                        bit_util::set_bit_raw(data.as_mut_ptr(), i);
532                    }
533                }
534            }
535        });
536
537        let data = unsafe {
538            ArrayData::new_unchecked(
539                DataType::Boolean,
540                data_len,
541                None,
542                Some(null_builder.into()),
543                0,
544                vec![val_builder.into()],
545                vec![],
546            )
547        };
548        BooleanArray::from(data)
549    }
550}
551
552impl From<BooleanBuffer> for BooleanArray {
553    fn from(values: BooleanBuffer) -> Self {
554        Self {
555            values,
556            nulls: None,
557        }
558    }
559}
560
561#[cfg(test)]
562mod tests {
563    use super::*;
564    use arrow_buffer::Buffer;
565    use rand::{Rng, rng};
566
567    #[test]
568    fn test_boolean_fmt_debug() {
569        let arr = BooleanArray::from(vec![true, false, false]);
570        assert_eq!(
571            "BooleanArray\n[\n  true,\n  false,\n  false,\n]",
572            format!("{arr:?}")
573        );
574    }
575
576    #[test]
577    fn test_boolean_with_null_fmt_debug() {
578        let mut builder = BooleanArray::builder(3);
579        builder.append_value(true);
580        builder.append_null();
581        builder.append_value(false);
582        let arr = builder.finish();
583        assert_eq!(
584            "BooleanArray\n[\n  true,\n  null,\n  false,\n]",
585            format!("{arr:?}")
586        );
587    }
588
589    #[test]
590    fn test_boolean_array_from_vec() {
591        let buf = Buffer::from([10_u8]);
592        let arr = BooleanArray::from(vec![false, true, false, true]);
593        assert_eq!(&buf, arr.values().inner());
594        assert_eq!(4, arr.len());
595        assert_eq!(0, arr.offset());
596        assert_eq!(0, arr.null_count());
597        for i in 0..4 {
598            assert!(!arr.is_null(i));
599            assert!(arr.is_valid(i));
600            assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
601        }
602    }
603
604    #[test]
605    fn test_boolean_array_from_vec_option() {
606        let buf = Buffer::from([10_u8]);
607        let arr = BooleanArray::from(vec![Some(false), Some(true), None, Some(true)]);
608        assert_eq!(&buf, arr.values().inner());
609        assert_eq!(4, arr.len());
610        assert_eq!(0, arr.offset());
611        assert_eq!(1, arr.null_count());
612        for i in 0..4 {
613            if i == 2 {
614                assert!(arr.is_null(i));
615                assert!(!arr.is_valid(i));
616            } else {
617                assert!(!arr.is_null(i));
618                assert!(arr.is_valid(i));
619                assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
620            }
621        }
622    }
623
624    #[test]
625    fn test_boolean_array_from_packed() {
626        let v = [1_u8, 2_u8, 3_u8];
627        let arr = BooleanArray::new_from_packed(v, 0, 24);
628        assert_eq!(24, arr.len());
629        assert_eq!(0, arr.offset());
630        assert_eq!(0, arr.null_count());
631        assert!(arr.nulls.is_none());
632        for i in 0..24 {
633            assert!(!arr.is_null(i));
634            assert!(arr.is_valid(i));
635            assert_eq!(
636                i == 0 || i == 9 || i == 16 || i == 17,
637                arr.value(i),
638                "failed t {i}"
639            )
640        }
641    }
642
643    #[test]
644    fn test_boolean_array_from_slice_u8() {
645        let v: Vec<u8> = vec![1, 2, 3];
646        let slice = &v[..];
647        let arr = BooleanArray::new_from_u8(slice);
648        assert_eq!(24, arr.len());
649        assert_eq!(0, arr.offset());
650        assert_eq!(0, arr.null_count());
651        assert!(arr.nulls().is_none());
652        for i in 0..24 {
653            assert!(!arr.is_null(i));
654            assert!(arr.is_valid(i));
655            assert_eq!(
656                i == 0 || i == 9 || i == 16 || i == 17,
657                arr.value(i),
658                "failed t {i}"
659            )
660        }
661    }
662
663    #[test]
664    fn test_boolean_array_from_iter() {
665        let v = vec![Some(false), Some(true), Some(false), Some(true)];
666        let arr = v.into_iter().collect::<BooleanArray>();
667        assert_eq!(4, arr.len());
668        assert_eq!(0, arr.offset());
669        assert_eq!(0, arr.null_count());
670        assert!(arr.nulls().is_none());
671        for i in 0..3 {
672            assert!(!arr.is_null(i));
673            assert!(arr.is_valid(i));
674            assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
675        }
676    }
677
678    #[test]
679    fn test_boolean_array_from_non_nullable_iter() {
680        let v = vec![true, false, true];
681        let arr = v.into_iter().collect::<BooleanArray>();
682        assert_eq!(3, arr.len());
683        assert_eq!(0, arr.offset());
684        assert_eq!(0, arr.null_count());
685        assert!(arr.nulls().is_none());
686
687        assert!(arr.value(0));
688        assert!(!arr.value(1));
689        assert!(arr.value(2));
690    }
691
692    #[test]
693    fn test_boolean_array_from_nullable_iter() {
694        let v = vec![Some(true), None, Some(false), None];
695        let arr = v.into_iter().collect::<BooleanArray>();
696        assert_eq!(4, arr.len());
697        assert_eq!(0, arr.offset());
698        assert_eq!(2, arr.null_count());
699        assert!(arr.nulls().is_some());
700
701        assert!(arr.is_valid(0));
702        assert!(arr.is_null(1));
703        assert!(arr.is_valid(2));
704        assert!(arr.is_null(3));
705
706        assert!(arr.value(0));
707        assert!(!arr.value(2));
708    }
709
710    #[test]
711    fn test_boolean_array_from_nullable_trusted_len_iter() {
712        // Should exhibit the same behavior as `from_iter`, which is tested above.
713        let v = vec![Some(true), None, Some(false), None];
714        let expected = v.clone().into_iter().collect::<BooleanArray>();
715        let actual = unsafe {
716            // SAFETY: `v` has trusted length
717            BooleanArray::from_trusted_len_iter(v.into_iter())
718        };
719        assert_eq!(expected, actual);
720    }
721
722    #[test]
723    fn test_boolean_array_from_iter_with_larger_upper_bound() {
724        // See https://github.com/apache/arrow-rs/issues/8505
725        // This returns an upper size hint of 4
726        let iterator = vec![Some(true), None, Some(false), None]
727            .into_iter()
728            .filter(Option::is_some);
729        let arr = iterator.collect::<BooleanArray>();
730        assert_eq!(2, arr.len());
731    }
732
733    #[test]
734    fn test_boolean_array_builder() {
735        // Test building a boolean array with ArrayData builder and offset
736        // 000011011
737        let buf = Buffer::from([27_u8]);
738        let buf2 = buf.clone();
739        let data = ArrayData::builder(DataType::Boolean)
740            .len(5)
741            .offset(2)
742            .add_buffer(buf)
743            .build()
744            .unwrap();
745        let arr = BooleanArray::from(data);
746        assert_eq!(&buf2, arr.values().inner());
747        assert_eq!(5, arr.len());
748        assert_eq!(2, arr.offset());
749        assert_eq!(0, arr.null_count());
750        for i in 0..3 {
751            assert_eq!(i != 0, arr.value(i), "failed at {i}");
752        }
753    }
754
755    #[test]
756    #[should_panic(
757        expected = "Trying to access an element at index 4 from a BooleanArray of length 3"
758    )]
759    fn test_fixed_size_binary_array_get_value_index_out_of_bound() {
760        let v = vec![Some(true), None, Some(false)];
761        let array = v.into_iter().collect::<BooleanArray>();
762
763        array.value(4);
764    }
765
766    #[test]
767    #[should_panic(expected = "BooleanArray data should contain a single buffer only \
768                               (values buffer)")]
769    // Different error messages, so skip for now
770    // https://github.com/apache/arrow-rs/issues/1545
771    #[cfg(not(feature = "force_validate"))]
772    fn test_boolean_array_invalid_buffer_len() {
773        let data = unsafe {
774            ArrayData::builder(DataType::Boolean)
775                .len(5)
776                .build_unchecked()
777        };
778        drop(BooleanArray::from(data));
779    }
780
781    #[test]
782    #[should_panic(expected = "BooleanArray expected ArrayData with type Boolean got Int32")]
783    fn test_from_array_data_validation() {
784        let _ = BooleanArray::from(ArrayData::new_empty(&DataType::Int32));
785    }
786
787    #[test]
788    #[cfg_attr(miri, ignore)] // Takes too long
789    fn test_true_false_count() {
790        let mut rng = rng();
791
792        for _ in 0..10 {
793            // No nulls
794            let d: Vec<_> = (0..2000).map(|_| rng.random_bool(0.5)).collect();
795            let b = BooleanArray::from(d.clone());
796
797            let expected_true = d.iter().filter(|x| **x).count();
798            assert_eq!(b.true_count(), expected_true);
799            assert_eq!(b.false_count(), d.len() - expected_true);
800
801            // With nulls
802            let d: Vec<_> = (0..2000)
803                .map(|_| rng.random_bool(0.5).then(|| rng.random_bool(0.5)))
804                .collect();
805            let b = BooleanArray::from(d.clone());
806
807            let expected_true = d.iter().filter(|x| matches!(x, Some(true))).count();
808            assert_eq!(b.true_count(), expected_true);
809
810            let expected_false = d.iter().filter(|x| matches!(x, Some(false))).count();
811            assert_eq!(b.false_count(), expected_false);
812        }
813    }
814
815    #[test]
816    fn test_into_parts() {
817        let boolean_array = [Some(true), None, Some(false)]
818            .into_iter()
819            .collect::<BooleanArray>();
820        let (values, nulls) = boolean_array.into_parts();
821        assert_eq!(values.values(), &[0b0000_0001]);
822        assert!(nulls.is_some());
823        assert_eq!(nulls.unwrap().buffer().as_slice(), &[0b0000_0101]);
824
825        let boolean_array =
826            BooleanArray::from(vec![false, false, false, false, false, false, false, true]);
827        let (values, nulls) = boolean_array.into_parts();
828        assert_eq!(values.values(), &[0b1000_0000]);
829        assert!(nulls.is_none());
830    }
831
832    #[test]
833    fn test_new_null_array() {
834        let arr = BooleanArray::new_null(5);
835
836        assert_eq!(arr.len(), 5);
837        assert_eq!(arr.null_count(), 5);
838        assert_eq!(arr.true_count(), 0);
839        assert_eq!(arr.false_count(), 0);
840
841        for i in 0..5 {
842            assert!(arr.is_null(i));
843            assert!(!arr.is_valid(i));
844        }
845    }
846
847    #[test]
848    fn test_slice_with_nulls() {
849        let arr = BooleanArray::from(vec![Some(true), None, Some(false)]);
850        let sliced = arr.slice(1, 2);
851
852        assert_eq!(sliced.len(), 2);
853        assert_eq!(sliced.null_count(), 1);
854
855        assert!(sliced.is_null(0));
856        assert!(sliced.is_valid(1));
857        assert!(!sliced.value(1));
858    }
859}
arrow_array/array/boolean_array.rs

arrow_array/array/
boolean_array.rs
