expression: truncate decimal instead of return err when PreparedStatement

[ChangRui-Ryan]

What problem does this PR solve?

Issue Number: close #62602

Problem Summary:

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.

None

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by triage owners.
Adding the do-not-merge/cherry-pick-not-approved label.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign xuhuaiyu for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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[ti-chi-bot]

Welcome @ChangRui-Ryan!

It looks like this is your first PR to pingcap/tidb 🎉.

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Thank you, and welcome to pingcap/tidb. 😃

[ti-chi-bot]

Hi @ChangRui-Ryan. Thanks for your PR.

I'm waiting for a pingcap member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[pingcap-cla-assistant]

All committers have signed the CLA.

[tiprow]

Hi @ChangRui-Ryan. Thanks for your PR.

PRs from untrusted users cannot be marked as trusted with /ok-to-test in this repo meaning untrusted PR authors can never trigger tests themselves. Collaborators can still trigger tests on the PR using /test all.

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[lance6716]

Hi, can you open an issue to explain what problem this PR will solve?

[ChangRui-Ryan]

Hi, can you open an issue to explain what problem this PR will solve?

Thanks for reminding me. It try to close #62602. updated in pr desc too.

[lance6716]

/ok-to-test

And please follow bot's comment to sign CLA

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (release-8.5@6622eb0). Learn more about missing BASE report.

Additional details and impacted files

@@               Coverage Diff                @@
##             release-8.5     #62757   +/-   ##
================================================
  Coverage               ?   37.0100%           
================================================
  Files                  ?       1685           
  Lines                  ?     615497           
  Branches               ?          0           
================================================
  Hits                   ?     227796           
  Misses                 ?     365358           
  Partials               ?      22343           

Flag	Coverage Δ
integration	37.0100% <0.0000%> (?)

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

Components	Coverage Δ
dumpling	∅ <0.0000%> (?)
parser	∅ <0.0000%> (?)
br	23.1812% <0.0000%> (?)

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[ti-chi-bot]

@ChangRui-Ryan: 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
idc-jenkins-ci-tidb/check_dev_2	9e82a90	link	true	/test check-dev2
idc-jenkins-ci-tidb/unit-test	9e82a90	link	true	/test unit-test

Full PR test history. Your PR dashboard.

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. I understand the commands that are listed here.