arrow_array/array/
boolean_array.rs

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4// regarding copyright ownership.  The ASF licenses this file
5// to you under the Apache License, Version 2.0 (the
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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 Array for BooleanArray {
290    fn as_any(&self) -> &dyn Any {
291        self
292    }
293
294    fn to_data(&self) -> ArrayData {
295        self.clone().into()
296    }
297
298    fn into_data(self) -> ArrayData {
299        self.into()
300    }
301
302    fn data_type(&self) -> &DataType {
303        &DataType::Boolean
304    }
305
306    fn slice(&self, offset: usize, length: usize) -> ArrayRef {
307        Arc::new(self.slice(offset, length))
308    }
309
310    fn len(&self) -> usize {
311        self.values.len()
312    }
313
314    fn is_empty(&self) -> bool {
315        self.values.is_empty()
316    }
317
318    fn shrink_to_fit(&mut self) {
319        self.values.shrink_to_fit();
320        if let Some(nulls) = &mut self.nulls {
321            nulls.shrink_to_fit();
322        }
323    }
324
325    fn offset(&self) -> usize {
326        self.values.offset()
327    }
328
329    fn nulls(&self) -> Option<&NullBuffer> {
330        self.nulls.as_ref()
331    }
332
333    fn logical_null_count(&self) -> usize {
334        self.null_count()
335    }
336
337    fn get_buffer_memory_size(&self) -> usize {
338        let mut sum = self.values.inner().capacity();
339        if let Some(x) = &self.nulls {
340            sum += x.buffer().capacity()
341        }
342        sum
343    }
344
345    fn get_array_memory_size(&self) -> usize {
346        std::mem::size_of::<Self>() + self.get_buffer_memory_size()
347    }
348}
349
350impl ArrayAccessor for &BooleanArray {
351    type Item = bool;
352
353    fn value(&self, index: usize) -> Self::Item {
354        BooleanArray::value(self, index)
355    }
356
357    unsafe fn value_unchecked(&self, index: usize) -> Self::Item {
358        unsafe { BooleanArray::value_unchecked(self, index) }
359    }
360}
361
362impl From<Vec<bool>> for BooleanArray {
363    fn from(data: Vec<bool>) -> Self {
364        let mut mut_buf = MutableBuffer::new_null(data.len());
365        {
366            let mut_slice = mut_buf.as_slice_mut();
367            for (i, b) in data.iter().enumerate() {
368                if *b {
369                    bit_util::set_bit(mut_slice, i);
370                }
371            }
372        }
373        let array_data = ArrayData::builder(DataType::Boolean)
374            .len(data.len())
375            .add_buffer(mut_buf.into());
376
377        let array_data = unsafe { array_data.build_unchecked() };
378        BooleanArray::from(array_data)
379    }
380}
381
382impl From<Vec<Option<bool>>> for BooleanArray {
383    fn from(data: Vec<Option<bool>>) -> Self {
384        data.iter().collect()
385    }
386}
387
388impl From<ArrayData> for BooleanArray {
389    fn from(data: ArrayData) -> Self {
390        assert_eq!(
391            data.data_type(),
392            &DataType::Boolean,
393            "BooleanArray expected ArrayData with type {} got {}",
394            DataType::Boolean,
395            data.data_type()
396        );
397        assert_eq!(
398            data.buffers().len(),
399            1,
400            "BooleanArray data should contain a single buffer only (values buffer)"
401        );
402        let values = BooleanBuffer::new(data.buffers()[0].clone(), data.offset(), data.len());
403
404        Self {
405            values,
406            nulls: data.nulls().cloned(),
407        }
408    }
409}
410
411impl From<BooleanArray> for ArrayData {
412    fn from(array: BooleanArray) -> Self {
413        let builder = ArrayDataBuilder::new(DataType::Boolean)
414            .len(array.values.len())
415            .offset(array.values.offset())
416            .nulls(array.nulls)
417            .buffers(vec![array.values.into_inner()]);
418
419        unsafe { builder.build_unchecked() }
420    }
421}
422
423impl<'a> IntoIterator for &'a BooleanArray {
424    type Item = Option<bool>;
425    type IntoIter = BooleanIter<'a>;
426
427    fn into_iter(self) -> Self::IntoIter {
428        BooleanIter::<'a>::new(self)
429    }
430}
431
432impl<'a> BooleanArray {
433    /// constructs a new iterator
434    pub fn iter(&'a self) -> BooleanIter<'a> {
435        BooleanIter::<'a>::new(self)
436    }
437}
438
439/// An optional boolean value
440///
441/// This struct is used as an adapter when creating `BooleanArray` from an iterator.
442/// `FromIterator` for `BooleanArray` takes an iterator where the elements can be `into`
443/// this struct. So once implementing `From` or `Into` trait for a type, an iterator of
444/// the type can be collected to `BooleanArray`.
445///
446/// See also [NativeAdapter](crate::array::NativeAdapter).
447#[derive(Debug)]
448struct BooleanAdapter {
449    /// Corresponding Rust native type if available
450    pub native: Option<bool>,
451}
452
453impl From<bool> for BooleanAdapter {
454    fn from(value: bool) -> Self {
455        BooleanAdapter {
456            native: Some(value),
457        }
458    }
459}
460
461impl From<&bool> for BooleanAdapter {
462    fn from(value: &bool) -> Self {
463        BooleanAdapter {
464            native: Some(*value),
465        }
466    }
467}
468
469impl From<Option<bool>> for BooleanAdapter {
470    fn from(value: Option<bool>) -> Self {
471        BooleanAdapter { native: value }
472    }
473}
474
475impl From<&Option<bool>> for BooleanAdapter {
476    fn from(value: &Option<bool>) -> Self {
477        BooleanAdapter { native: *value }
478    }
479}
480
481impl<Ptr: Into<BooleanAdapter>> FromIterator<Ptr> for BooleanArray {
482    fn from_iter<I: IntoIterator<Item = Ptr>>(iter: I) -> Self {
483        let iter = iter.into_iter();
484        let capacity = match iter.size_hint() {
485            (lower, Some(upper)) if lower == upper => lower,
486            _ => 0,
487        };
488        let mut builder = BooleanBuilder::with_capacity(capacity);
489        builder.extend(iter.map(|item| item.into().native));
490        builder.finish()
491    }
492}
493
494impl BooleanArray {
495    /// Creates a [`BooleanArray`] from an iterator of trusted length.
496    ///
497    /// # Safety
498    ///
499    /// The iterator must be [`TrustedLen`](https://doc.rust-lang.org/std/iter/trait.TrustedLen.html).
500    /// I.e. that `size_hint().1` correctly reports its length. Note that this is a stronger
501    /// guarantee that `ExactSizeIterator` provides which could still report a wrong length.
502    ///
503    /// # Panics
504    ///
505    /// Panics if the iterator does not report an upper bound on `size_hint()`.
506    #[inline]
507    #[allow(
508        private_bounds,
509        reason = "We will expose BooleanAdapter if there is a need"
510    )]
511    pub unsafe fn from_trusted_len_iter<I, P>(iter: I) -> Self
512    where
513        P: Into<BooleanAdapter>,
514        I: ExactSizeIterator<Item = P>,
515    {
516        let data_len = iter.len();
517
518        let num_bytes = bit_util::ceil(data_len, 8);
519        let mut null_builder = MutableBuffer::from_len_zeroed(num_bytes);
520        let mut val_builder = MutableBuffer::from_len_zeroed(num_bytes);
521
522        let data = val_builder.as_slice_mut();
523
524        let null_slice = null_builder.as_slice_mut();
525        iter.enumerate().for_each(|(i, item)| {
526            if let Some(a) = item.into().native {
527                unsafe {
528                    // SAFETY: There will be enough space in the buffers due to the trusted len size
529                    // hint
530                    bit_util::set_bit_raw(null_slice.as_mut_ptr(), i);
531                    if a {
532                        bit_util::set_bit_raw(data.as_mut_ptr(), i);
533                    }
534                }
535            }
536        });
537
538        let data = unsafe {
539            ArrayData::new_unchecked(
540                DataType::Boolean,
541                data_len,
542                None,
543                Some(null_builder.into()),
544                0,
545                vec![val_builder.into()],
546                vec![],
547            )
548        };
549        BooleanArray::from(data)
550    }
551}
552
553impl From<BooleanBuffer> for BooleanArray {
554    fn from(values: BooleanBuffer) -> Self {
555        Self {
556            values,
557            nulls: None,
558        }
559    }
560}
561
562#[cfg(test)]
563mod tests {
564    use super::*;
565    use arrow_buffer::Buffer;
566    use rand::{Rng, rng};
567
568    #[test]
569    fn test_boolean_fmt_debug() {
570        let arr = BooleanArray::from(vec![true, false, false]);
571        assert_eq!(
572            "BooleanArray\n[\n  true,\n  false,\n  false,\n]",
573            format!("{arr:?}")
574        );
575    }
576
577    #[test]
578    fn test_boolean_with_null_fmt_debug() {
579        let mut builder = BooleanArray::builder(3);
580        builder.append_value(true);
581        builder.append_null();
582        builder.append_value(false);
583        let arr = builder.finish();
584        assert_eq!(
585            "BooleanArray\n[\n  true,\n  null,\n  false,\n]",
586            format!("{arr:?}")
587        );
588    }
589
590    #[test]
591    fn test_boolean_array_from_vec() {
592        let buf = Buffer::from([10_u8]);
593        let arr = BooleanArray::from(vec![false, true, false, true]);
594        assert_eq!(&buf, arr.values().inner());
595        assert_eq!(4, arr.len());
596        assert_eq!(0, arr.offset());
597        assert_eq!(0, arr.null_count());
598        for i in 0..4 {
599            assert!(!arr.is_null(i));
600            assert!(arr.is_valid(i));
601            assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
602        }
603    }
604
605    #[test]
606    fn test_boolean_array_from_vec_option() {
607        let buf = Buffer::from([10_u8]);
608        let arr = BooleanArray::from(vec![Some(false), Some(true), None, Some(true)]);
609        assert_eq!(&buf, arr.values().inner());
610        assert_eq!(4, arr.len());
611        assert_eq!(0, arr.offset());
612        assert_eq!(1, arr.null_count());
613        for i in 0..4 {
614            if i == 2 {
615                assert!(arr.is_null(i));
616                assert!(!arr.is_valid(i));
617            } else {
618                assert!(!arr.is_null(i));
619                assert!(arr.is_valid(i));
620                assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
621            }
622        }
623    }
624
625    #[test]
626    fn test_boolean_array_from_packed() {
627        let v = [1_u8, 2_u8, 3_u8];
628        let arr = BooleanArray::new_from_packed(v, 0, 24);
629        assert_eq!(24, arr.len());
630        assert_eq!(0, arr.offset());
631        assert_eq!(0, arr.null_count());
632        assert!(arr.nulls.is_none());
633        for i in 0..24 {
634            assert!(!arr.is_null(i));
635            assert!(arr.is_valid(i));
636            assert_eq!(
637                i == 0 || i == 9 || i == 16 || i == 17,
638                arr.value(i),
639                "failed t {i}"
640            )
641        }
642    }
643
644    #[test]
645    fn test_boolean_array_from_slice_u8() {
646        let v: Vec<u8> = vec![1, 2, 3];
647        let slice = &v[..];
648        let arr = BooleanArray::new_from_u8(slice);
649        assert_eq!(24, arr.len());
650        assert_eq!(0, arr.offset());
651        assert_eq!(0, arr.null_count());
652        assert!(arr.nulls().is_none());
653        for i in 0..24 {
654            assert!(!arr.is_null(i));
655            assert!(arr.is_valid(i));
656            assert_eq!(
657                i == 0 || i == 9 || i == 16 || i == 17,
658                arr.value(i),
659                "failed t {i}"
660            )
661        }
662    }
663
664    #[test]
665    fn test_boolean_array_from_iter() {
666        let v = vec![Some(false), Some(true), Some(false), Some(true)];
667        let arr = v.into_iter().collect::<BooleanArray>();
668        assert_eq!(4, arr.len());
669        assert_eq!(0, arr.offset());
670        assert_eq!(0, arr.null_count());
671        assert!(arr.nulls().is_none());
672        for i in 0..3 {
673            assert!(!arr.is_null(i));
674            assert!(arr.is_valid(i));
675            assert_eq!(i == 1 || i == 3, arr.value(i), "failed at {i}")
676        }
677    }
678
679    #[test]
680    fn test_boolean_array_from_non_nullable_iter() {
681        let v = vec![true, false, true];
682        let arr = v.into_iter().collect::<BooleanArray>();
683        assert_eq!(3, arr.len());
684        assert_eq!(0, arr.offset());
685        assert_eq!(0, arr.null_count());
686        assert!(arr.nulls().is_none());
687
688        assert!(arr.value(0));
689        assert!(!arr.value(1));
690        assert!(arr.value(2));
691    }
692
693    #[test]
694    fn test_boolean_array_from_nullable_iter() {
695        let v = vec![Some(true), None, Some(false), None];
696        let arr = v.into_iter().collect::<BooleanArray>();
697        assert_eq!(4, arr.len());
698        assert_eq!(0, arr.offset());
699        assert_eq!(2, arr.null_count());
700        assert!(arr.nulls().is_some());
701
702        assert!(arr.is_valid(0));
703        assert!(arr.is_null(1));
704        assert!(arr.is_valid(2));
705        assert!(arr.is_null(3));
706
707        assert!(arr.value(0));
708        assert!(!arr.value(2));
709    }
710
711    #[test]
712    fn test_boolean_array_from_nullable_trusted_len_iter() {
713        // Should exhibit the same behavior as `from_iter`, which is tested above.
714        let v = vec![Some(true), None, Some(false), None];
715        let expected = v.clone().into_iter().collect::<BooleanArray>();
716        let actual = unsafe {
717            // SAFETY: `v` has trusted length
718            BooleanArray::from_trusted_len_iter(v.into_iter())
719        };
720        assert_eq!(expected, actual);
721    }
722
723    #[test]
724    fn test_boolean_array_from_iter_with_larger_upper_bound() {
725        // See https://github.com/apache/arrow-rs/issues/8505
726        // This returns an upper size hint of 4
727        let iterator = vec![Some(true), None, Some(false), None]
728            .into_iter()
729            .filter(Option::is_some);
730        let arr = iterator.collect::<BooleanArray>();
731        assert_eq!(2, arr.len());
732    }
733
734    #[test]
735    fn test_boolean_array_builder() {
736        // Test building a boolean array with ArrayData builder and offset
737        // 000011011
738        let buf = Buffer::from([27_u8]);
739        let buf2 = buf.clone();
740        let data = ArrayData::builder(DataType::Boolean)
741            .len(5)
742            .offset(2)
743            .add_buffer(buf)
744            .build()
745            .unwrap();
746        let arr = BooleanArray::from(data);
747        assert_eq!(&buf2, arr.values().inner());
748        assert_eq!(5, arr.len());
749        assert_eq!(2, arr.offset());
750        assert_eq!(0, arr.null_count());
751        for i in 0..3 {
752            assert_eq!(i != 0, arr.value(i), "failed at {i}");
753        }
754    }
755
756    #[test]
757    #[should_panic(
758        expected = "Trying to access an element at index 4 from a BooleanArray of length 3"
759    )]
760    fn test_fixed_size_binary_array_get_value_index_out_of_bound() {
761        let v = vec![Some(true), None, Some(false)];
762        let array = v.into_iter().collect::<BooleanArray>();
763
764        array.value(4);
765    }
766
767    #[test]
768    #[should_panic(expected = "BooleanArray data should contain a single buffer only \
769                               (values buffer)")]
770    // Different error messages, so skip for now
771    // https://github.com/apache/arrow-rs/issues/1545
772    #[cfg(not(feature = "force_validate"))]
773    fn test_boolean_array_invalid_buffer_len() {
774        let data = unsafe {
775            ArrayData::builder(DataType::Boolean)
776                .len(5)
777                .build_unchecked()
778        };
779        drop(BooleanArray::from(data));
780    }
781
782    #[test]
783    #[should_panic(expected = "BooleanArray expected ArrayData with type Boolean got Int32")]
784    fn test_from_array_data_validation() {
785        let _ = BooleanArray::from(ArrayData::new_empty(&DataType::Int32));
786    }
787
788    #[test]
789    #[cfg_attr(miri, ignore)] // Takes too long
790    fn test_true_false_count() {
791        let mut rng = rng();
792
793        for _ in 0..10 {
794            // No nulls
795            let d: Vec<_> = (0..2000).map(|_| rng.random_bool(0.5)).collect();
796            let b = BooleanArray::from(d.clone());
797
798            let expected_true = d.iter().filter(|x| **x).count();
799            assert_eq!(b.true_count(), expected_true);
800            assert_eq!(b.false_count(), d.len() - expected_true);
801
802            // With nulls
803            let d: Vec<_> = (0..2000)
804                .map(|_| rng.random_bool(0.5).then(|| rng.random_bool(0.5)))
805                .collect();
806            let b = BooleanArray::from(d.clone());
807
808            let expected_true = d.iter().filter(|x| matches!(x, Some(true))).count();
809            assert_eq!(b.true_count(), expected_true);
810
811            let expected_false = d.iter().filter(|x| matches!(x, Some(false))).count();
812            assert_eq!(b.false_count(), expected_false);
813        }
814    }
815
816    #[test]
817    fn test_into_parts() {
818        let boolean_array = [Some(true), None, Some(false)]
819            .into_iter()
820            .collect::<BooleanArray>();
821        let (values, nulls) = boolean_array.into_parts();
822        assert_eq!(values.values(), &[0b0000_0001]);
823        assert!(nulls.is_some());
824        assert_eq!(nulls.unwrap().buffer().as_slice(), &[0b0000_0101]);
825
826        let boolean_array =
827            BooleanArray::from(vec![false, false, false, false, false, false, false, true]);
828        let (values, nulls) = boolean_array.into_parts();
829        assert_eq!(values.values(), &[0b1000_0000]);
830        assert!(nulls.is_none());
831    }
832}
arrow_array/array/boolean_array.rs

arrow_array/array/
boolean_array.rs
