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executor,types: Fix truncate function behavior when second param is large negative (#53075) #53124

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This is an automated cherry-pick of #53075

What problem does this PR solve?

Issue Number: close #52978

Problem Summary:
The root cause is tidb's truncate function returns NaN for corner cases. While in topN executor, we compare float64 using go lib function which treats NaN as min:

return cmp.Compare(l.GetFloat64(lCol), r.GetFloat64(rCol))

What changed and how does it work?

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No need to test
    • I checked and no code files have been changed.

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

Please refer to Release Notes Language Style Guide to write a quality release note.

None

@yibin87
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yibin87 commented May 9, 2024

/cc @xzhangxian1008

@ti-chi-bot ti-chi-bot bot requested a review from xzhangxian1008 May 9, 2024 05:45
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@yibin87 yibin87 left a comment

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LGTM

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ti-chi-bot bot commented May 9, 2024

@yibin87: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to this:

LGTM

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codecov bot commented May 9, 2024

Codecov Report

Attention: Patch coverage is 40.00000% with 3 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (release-8.1@c191831). Click here to learn what that means.

Additional details and impacted files
@@               Coverage Diff                @@
##             release-8.1     #53124   +/-   ##
================================================
  Coverage               ?   71.2374%           
================================================
  Files                  ?       1463           
  Lines                  ?     421131           
  Branches               ?          0           
================================================
  Hits                   ?     300003           
  Misses                 ?     100684           
  Partials               ?      20444           
Flag Coverage Δ
unit 71.2374% <40.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components Coverage Δ
dumpling 53.9957% <0.0000%> (?)
parser ∅ <0.0000%> (?)
br 40.9887% <0.0000%> (?)

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LGTM

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@xzhangxian1008 xzhangxian1008 left a comment

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LGTM

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ti-chi-bot bot commented May 9, 2024

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windtalker, xzhangxian1008, yibin87

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ti-chi-bot bot commented May 9, 2024

[LGTM Timeline notifier]

Timeline:

  • 2024-05-09 08:07:56.651235619 +0000 UTC m=+1122230.408371189: ☑️ agreed by windtalker.
  • 2024-05-09 08:23:03.337245093 +0000 UTC m=+1123137.094380667: ☑️ agreed by xzhangxian1008.

@yibin87
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yibin87 commented May 9, 2024

/test mysql-test

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tiprow bot commented May 9, 2024

@yibin87: No presubmit jobs available for pingcap/tidb@release-8.1

In response to this:

/test mysql-test

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@ti-chi-bot ti-chi-bot bot merged commit f8d7b96 into pingcap:release-8.1 May 9, 2024
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4 participants