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Improve the performance of length and ascii functions (#9345) #9400

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This is an automated cherry-pick of #9345

What problem does this PR solve?

Issue Number: close #9344

Problem Summary:

What is changed and how it works?

Benchmark from bench_function_string.cpp

           origin         optimized
length    19794917 ns    1824123 ns 985.2%
ascii     20572895 ns    2592171 ns 693.7%

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No code

Side effects

  • Performance regression: Consumes more CPU
  • Performance regression: Consumes more Memory
  • Breaking backward compatibility

Documentation

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

Release note

None

@ti-chi-bot ti-chi-bot added release-note-none Denotes a PR that doesn't merit a release note. size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. type/cherry-pick-for-release-6.5 This PR is cherry-picked to release-6.5 from a source PR. labels Sep 3, 2024
@ti-chi-bot ti-chi-bot bot added size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. and removed size/XL Denotes a PR that changes 500-999 lines, ignoring generated files. labels Sep 3, 2024
@xzhangxian1008
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/retest

@xzhangxian1008
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/run-all-tests

@JaySon-Huang
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/run-all-tests

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@yibin87 yibin87 left a comment

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LGTM

@ti-chi-bot ti-chi-bot bot added needs-1-more-lgtm Indicates a PR needs 1 more LGTM. approved labels Sep 6, 2024
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@windtalker windtalker left a comment

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lgtm

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ti-chi-bot bot commented Sep 6, 2024

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windtalker, yibin87

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@ti-chi-bot ti-chi-bot bot added lgtm and removed needs-1-more-lgtm Indicates a PR needs 1 more LGTM. labels Sep 6, 2024
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ti-chi-bot bot commented Sep 6, 2024

[LGTM Timeline notifier]

Timeline:

  • 2024-09-06 06:52:49.128828779 +0000 UTC m=+600093.646881703: ☑️ agreed by yibin87.
  • 2024-09-06 06:55:14.469438502 +0000 UTC m=+600238.987491428: ☑️ agreed by windtalker.

@ti-chi-bot ti-chi-bot bot merged commit 50bd2b0 into pingcap:release-6.5 Sep 6, 2024
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approved cherry-pick-approved Cherry pick PR approved by release team. lgtm release-note-none Denotes a PR that doesn't merit a release note. size/XXL Denotes a PR that changes 1000+ lines, ignoring generated files. type/cherry-pick-for-release-6.5 This PR is cherry-picked to release-6.5 from a source PR.
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5 participants