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Fix nullif null count (#3579) #3590

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merged 2 commits into from
Jan 24, 2023
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tustvold
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Which issue does this PR close?

Closes #3579

Rationale for this change

What changes are included in this PR?

Are there any user-facing changes?

@github-actions github-actions bot added the arrow Changes to the arrow crate label Jan 23, 2023
let t = !b;
valid_count += t.count_ones() as usize;
null_count += t.count_zeros() as usize;
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Don't need to compensate remainder bits?

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@tustvold tustvold Jan 23, 2023

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Nope, we instead exploit the property that the remainder bits will always be 0 (and therefore the corresponding bits in t will be 1)

@tustvold tustvold merged commit b35e179 into apache:master Jan 24, 2023
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ursabot commented Jan 24, 2023

Benchmark runs are scheduled for baseline = b826657 and contender = b35e179. b35e179 is a master commit associated with this PR. Results will be available as each benchmark for each run completes.
Conbench compare runs links:
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ec2-t3-xlarge-us-east-2] ec2-t3-xlarge-us-east-2
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on test-mac-arm] test-mac-arm
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-i9-9960x] ursa-i9-9960x
[Skipped ⚠️ Benchmarking of arrow-rs-commits is not supported on ursa-thinkcentre-m75q] ursa-thinkcentre-m75q
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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nullif incorrectly calculates null_count, sometimes panics with substraction overflow error
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