executor: Fix the parse problematic slow log panic issue due to empty value string (#58258)

[ti-chi-bot]

This is an automated cherry-pick of #58258

What problem does this PR solve?

Issue Number: close #58147

Problem Summary:
Handle uncommon empty value string case in slow log. Checked that queries for system tables, like stats_meta, will generate empty copr address.

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.

Fix the issue that queries for slow log may fail when some item's value is empty. 

[windtalker]

lgtm

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [hawkingrei,windtalker]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-16 04:03:13.593310864 +0000 UTC m=+843183.682113406: ☑️ agreed by windtalker.
• 2024-12-16 04:03:48.456449719 +0000 UTC m=+843218.545252263: ☑️ agreed by hawkingrei.

[yibin87]

/hold

[yibin87]

/unhold

[codecov]

Codecov Report

Attention: Patch coverage is 69.23077% with 4 lines in your changes missing coverage. Please review.

Please upload report for BASE (release-8.5@a4f58fe). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #58275   +/-   ##
================================================
  Coverage               ?   56.9079%           
================================================
  Files                  ?       1773           
  Lines                  ?     627123           
  Branches               ?          0           
================================================
  Hits                   ?     356883           
  Misses                 ?     246057           
  Partials               ?      24183           

Flag	Coverage Δ
integration	36.8712% <0.0000%> (?)
unit	72.5262% <69.2307%> (?)

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

Components	Coverage Δ
dumpling	52.8711% <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	52.2857% <0.0000%> (?)

[yibin87]

/test unit-test

[tiprow]

@yibin87: No presubmit jobs available for pingcap/tidb@release-8.5

In response to this:

/test unit-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.

[yibin87]

/test unit-test

[tiprow]

@yibin87: No presubmit jobs available for pingcap/tidb@release-8.5

In response to this:

/test unit-test

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.