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Fix ilike_utf8_scalar kernals #2545

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merged 3 commits into from Aug 23, 2022
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psvri
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@psvri psvri commented Aug 21, 2022

Which issue does this PR close?

Closes #2544 .

Rationale for this change

Incorrect logic in equals path of ilike_utf8_scalar kernals

What changes are included in this PR?

Bug fix

Are there any user-facing changes?

@github-actions github-actions bot added the arrow Changes to the arrow crate label Aug 21, 2022
@@ -468,7 +468,7 @@ pub fn ilike_utf8_scalar<OffsetSize: OffsetSizeTrait>(
if !right.contains(is_like_pattern) {
// fast path, can use equals
for i in 0..left.len() {
result.append(left.value(i) == right);
result.append(left.value(i).to_uppercase() == right.to_uppercase());
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This needs to be done once only for the right scalar?

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Sorry, A bit confused.

Did you mean that the right.to_uppercase() and be extracted to outside the if block rather than doing it every time in the if else blocks ?

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Yes, and also outside the inner loop. The compiler often won't find out that it's possible to do this.

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Fixed in the latest commit

@@ -551,7 +551,7 @@ pub fn nilike_utf8_scalar<OffsetSize: OffsetSizeTrait>(
if !right.contains(is_like_pattern) {
// fast path, can use equals
for i in 0..left.len() {
result.append(left.value(i) != right);
result.append(left.value(i).to_uppercase() != right.to_uppercase());
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Can be done once only

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Very nice 👍

@tustvold tustvold merged commit b2f0c65 into apache:master Aug 23, 2022
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ursabot commented Aug 23, 2022

Benchmark runs are scheduled for baseline = 89f2e45 and contender = b2f0c65. b2f0c65 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

@psvri psvri deleted the ilike_kernel_fix branch September 6, 2022 12:38
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Ilike_ut8_scalar kernals have incorrect logic
4 participants