executor: fix data race in the buildMemTableReader (#43431)

[ti-chi-bot]

This is an automated cherry-pick of #43431

What problem does this PR solve?

Issue Number: close #43118

Problem Summary:

What is changed and how it works?

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

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

None

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Please upload report for BASE (release-6.5@6610dd4). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #55674   +/-   ##
================================================
  Coverage               ?   73.6194%           
================================================
  Files                  ?       1096           
  Lines                  ?     352438           
  Branches               ?          0           
================================================
  Hits                   ?     259463           
  Misses                 ?      76290           
  Partials               ?      16685           

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: Defined2014, tiancaiamao

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 [Defined2014,tiancaiamao]

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:

• 2024-08-28 02:57:46.625953228 +0000 UTC m=+925461.760403350: ☑️ agreed by Defined2014.
• 2024-08-28 03:31:21.999964568 +0000 UTC m=+927477.134414688: ☑️ agreed by tiancaiamao.