executor: optimize load data assignment expressions (#46082) | tidb-test=pr/2145

[ti-chi-bot]

This is an automated cherry-pick of #46082

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

[windtalker]

LGTM

[gengliqi]

/test mysql-test tidb-test=pr/2145

[tiprow]

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In response to this:

/test mysql-test tidb-test=pr/2145

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

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

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-08-15 09:11:40.096191719 +0000 UTC m=+622264.645207691: ☑️ agreed by windtalker.
• 2023-08-15 09:30:58.181670015 +0000 UTC m=+623422.730686002: ☑️ agreed by SeaRise.

[gengliqi]

/retest

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (release-6.5-20230425-v6.5.2@6e593be). Click here to learn what that means.
The diff coverage is n/a.

Additional details and impacted files

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