executor: Fix the parse problematic slow log panic issue due to empty value string

[yibin87]

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. 

[tiprow]

Hi @yibin87. Thanks for your PR.

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[yibin87]

/cc @xzhangxian1008 @windtalker

[codecov]

Codecov Report

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

Project coverage is 73.4771%. Comparing base (14e99ea) to head (5ce2371).
Report is 216 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #58258        +/-   ##
================================================
+ Coverage   72.8115%   73.4771%   +0.6655%     
================================================
  Files          1676       1694        +18     
  Lines        463414     489551     +26137     
================================================
+ Hits         337419     359708     +22289     
- Misses       105180     108618      +3438     
- Partials      20815      21225       +410     

Flag	Coverage Δ
integration	43.3026% <0.0000%> (?)
unit	72.5082% <69.2307%> (+0.3046%)	⬆️

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

Components	Coverage Δ
dumpling	52.6910% <ø> (-0.0764%)	⬇️
parser	∅ <ø> (∅)
br	43.4603% <ø> (-1.7956%)	⬇️

[windtalker]

lgtm

[xzhangxian1008]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2024-12-16 02:19:49.921108405 +0000 UTC m=+836980.009910935: ☑️ agreed by windtalker.
• 2024-12-16 02:29:12.467097592 +0000 UTC m=+837542.555900134: ☑️ agreed by xzhangxian1008.

[tiprow]

@yibin87: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	5ce2371	link	true	/test fast_test_tiprow
tidb_parser_test	5ce2371	link	true	/test tidb_parser_test

Full PR test history. Your PR dashboard.

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.1: #58270.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.5: #58271.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-6.1: #58272.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-7.5: #58273.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #58274.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #58275.