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Posted to github@arrow.apache.org by GitBox <gi...@apache.org> on 2022/10/27 20:57:26 UTC
[GitHub] [arrow-rs] tustvold opened a new pull request, #2957: Add BooleanArray::true_count and BooleanArray::false_count
tustvold opened a new pull request, #2957:
URL: https://github.com/apache/arrow-rs/pull/2957
# Which issue does this PR close?
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# Rationale for this change
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https://github.com/apache/arrow-datafusion/pull/3989#discussion_r1007328633
# What changes are included in this PR?
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[GitHub] [arrow-rs] alamb commented on pull request #2957: Add BooleanArray::true_count and BooleanArray::false_count
Posted by GitBox <gi...@apache.org>.
alamb commented on PR #2957:
URL: https://github.com/apache/arrow-rs/pull/2957#issuecomment-1295031171
I filed https://github.com/apache/arrow-rs/issues/2963 to track this
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[GitHub] [arrow-rs] ursabot commented on pull request #2957: Add BooleanArray::true_count and BooleanArray::false_count
Posted by GitBox <gi...@apache.org>.
ursabot commented on PR #2957:
URL: https://github.com/apache/arrow-rs/pull/2957#issuecomment-1295309740
Benchmark runs are scheduled for baseline = 87ac05bcafd343d3d8ad3b519631d83090afeb1c and contender = 843a2e5699a36537ff962d921d1c9aa0712a8d7c. 843a2e5699a36537ff962d921d1c9aa0712a8d7c is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] [ec2-t3-xlarge-us-east-2](https://conbench.ursa.dev/compare/runs/19b300e68d7c452c830c95a3fbe8d976...826b43bda96343c4b52afbdd6fb869b8/)
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on test-mac-arm] [test-mac-arm](https://conbench.ursa.dev/compare/runs/10eeb583f2ea4b7bbde0afdca7e315fb...549566a35b6d488d8c25d2ef6545218c/)
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] [ursa-i9-9960x](https://conbench.ursa.dev/compare/runs/dc65190ab83248229a0db244f0a0d729...00a375432ddd45deb95a73735c6b0b75/)
[Skipped :warning: Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] [ursa-thinkcentre-m75q](https://conbench.ursa.dev/compare/runs/9c9c82ded968482487c181b6053754af...a9b6e359cdb1402a80dc5734001b9059/)
Buildkite builds:
Supported benchmarks:
ec2-t3-xlarge-us-east-2: Supported benchmark langs: Python, R. Runs only benchmarks with cloud = True
test-mac-arm: Supported benchmark langs: C++, Python, R
ursa-i9-9960x: Supported benchmark langs: Python, R, JavaScript
ursa-thinkcentre-m75q: Supported benchmark langs: C++, Java
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[GitHub] [arrow-rs] tustvold commented on a diff in pull request #2957: Add BooleanArray::true_count and BooleanArray::false_count
Posted by GitBox <gi...@apache.org>.
tustvold commented on code in PR #2957:
URL: https://github.com/apache/arrow-rs/pull/2957#discussion_r1007372959
##########
arrow-array/src/array/boolean_array.rs:
##########
@@ -103,6 +103,53 @@ impl BooleanArray {
&self.data.buffers()[0]
}
+ /// Returns the number of true values within this buffer
+ pub fn true_count(&self) -> usize {
+ match self.data.null_buffer() {
+ Some(nulls) => {
+ let null_chunks = nulls.bit_chunks(self.offset(), self.len());
Review Comment:
The duplication is a bit annoying, but any attempt I made to eliminate it just resulted in more code
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[GitHub] [arrow-rs] tustvold merged pull request #2957: Add BooleanArray::true_count and BooleanArray::false_count
Posted by GitBox <gi...@apache.org>.
tustvold merged PR #2957:
URL: https://github.com/apache/arrow-rs/pull/2957
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[GitHub] [arrow-rs] alamb commented on a diff in pull request #2957: Add BooleanArray::true_count and BooleanArray::false_count
Posted by GitBox <gi...@apache.org>.
alamb commented on code in PR #2957:
URL: https://github.com/apache/arrow-rs/pull/2957#discussion_r1008026886
##########
arrow-array/src/array/boolean_array.rs:
##########
@@ -103,6 +103,53 @@ impl BooleanArray {
&self.data.buffers()[0]
}
+ /// Returns the number of true values within this buffer
Review Comment:
```suggestion
/// Returns the number of non null, true values within this array
```
##########
arrow-array/src/array/boolean_array.rs:
##########
@@ -103,6 +103,53 @@ impl BooleanArray {
&self.data.buffers()[0]
}
+ /// Returns the number of true values within this buffer
+ pub fn true_count(&self) -> usize {
+ match self.data.null_buffer() {
+ Some(nulls) => {
+ let null_chunks = nulls.bit_chunks(self.offset(), self.len());
+ let value_chunks = self.values().bit_chunks(self.offset(), self.len());
+ null_chunks
+ .iter()
+ .zip(value_chunks.iter())
+ .chain(std::iter::once((
+ null_chunks.remainder_bits(),
+ value_chunks.remainder_bits(),
+ )))
+ .map(|(a, b)| (a & b).count_ones() as usize)
+ .sum()
+ }
+ None => self
+ .values()
+ .count_set_bits_offset(self.offset(), self.len()),
+ }
+ }
+
+ /// Returns the number of false values within this buffer
+ pub fn false_count(&self) -> usize {
+ match self.data.null_buffer() {
Review Comment:
maybe this could be simplified into `self.size() - self.null_count() - self.true_count()` ? I think that would be basically as fast?
##########
arrow-array/src/array/boolean_array.rs:
##########
@@ -431,4 +479,29 @@ mod tests {
fn test_from_array_data_validation() {
let _ = BooleanArray::from(ArrayData::new_empty(&DataType::Int32));
}
+
+ #[test]
+ fn test_true_false_count() {
+ let mut rng = thread_rng();
+
+ for _ in 0..10 {
+ let d: Vec<_> = (0..2000).map(|_| rng.gen_bool(0.5)).collect();
Review Comment:
```suggestion
// no nulls
let d: Vec<_> = (0..2000).map(|_| rng.gen_bool(0.5)).collect();
```
##########
arrow-array/src/array/boolean_array.rs:
##########
@@ -431,4 +479,29 @@ mod tests {
fn test_from_array_data_validation() {
let _ = BooleanArray::from(ArrayData::new_empty(&DataType::Int32));
}
+
+ #[test]
+ fn test_true_false_count() {
+ let mut rng = thread_rng();
+
+ for _ in 0..10 {
+ let d: Vec<_> = (0..2000).map(|_| rng.gen_bool(0.5)).collect();
+ let b = BooleanArray::from(d.clone());
+
+ let expected_true = d.iter().filter(|x| **x).count();
+ assert_eq!(b.true_count(), expected_true);
+ assert_eq!(b.false_count(), d.len() - expected_true);
+
+ let d: Vec<_> = (0..2000)
Review Comment:
```suggestion
// with nulls
let d: Vec<_> = (0..2000)
```
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