executor: optimize load data assignment expressions

[gengliqi]

What problem does this PR solve?

Issue Number: close #46081

Problem Summary:
See #46081.

What is changed and how it works?

Calling rewriteAstExpr only once for each expression. Then evaluating these expressions for each row.

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.

Optimize load data assignment expressions

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5@361fe40). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-6.5     #46082   +/-   ##
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  Coverage               ?   73.6677%           
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  Files                  ?       1083           
  Lines                  ?     347543           
  Branches               ?          0           
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  Hits                   ?     256027           
  Misses                 ?      75070           
  Partials               ?      16446           

[D3Hunter]

can we have a test on cpu perf before/after this pr?

rest lgtm

[windtalker]

And should add some tests

[windtalker]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: D3Hunter, windtalker

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-15 03:22:23.074150689 +0000 UTC m=+601307.623166661: ☑️ agreed by D3Hunter.
• 2023-08-15 08:38:07.915748909 +0000 UTC m=+620252.464764881: ☑️ agreed by windtalker.

[gengliqi]

/cherrypick release-6.5-20230425-v6.5.2

[ti-chi-bot]

@gengliqi: new pull request created to branch release-6.5-20230425-v6.5.2: #46110.

In response to this:

/cherrypick release-6.5-20230425-v6.5.2

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