ddl: check TTL constraints for temporary tables

[cryo-zd]

What problem does this PR solve?

Issue Number: close #64948
This PR checked TTL constraints and removed them( if set ) when executing statement create temporary table temp like t;

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]

Hi @cryo-zd. 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.

I understand the commands that are listed here.

Details

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.

[tiprow]

Hi @cryo-zd. 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.

I understand the commands that are listed here.

Details

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.

[YangKeao]

IMO, it'd be better to validate after it builds the table. I'd suggest to add the check in (*DDLExec).createSessionTemporaryTable: if tblInfo.TTLInfo != nil {return dbterror.ErrTempTableNotAllowedWithTTL}.

Because for other cases, create table like and create global temporary table like ON COMMIT DELETE ROWS;, they are also validated after BuildTableInfoWithLike.

[YangKeao]

Good job. I've checked the following case (on tidb master branch):

mysql> create table t (id int primary key, created_time datetime) TTL = created_time + interval 24 hour;
Query OK, 0 rows affected (0.04 sec)

mysql> create temporary table t1 like t;
Query OK, 0 rows affected (0.00 sec)

mysql> create temporary table t2 (id int primary key, created_time datetime) TTL = created_time + interval 24 hour;
ERROR 8151 (HY000): Set TTL for temporary table is not allowed
mysql> create global temporary table t2 like t ON COMMIT DELETE ROWS;
ERROR 8151 (HY000): Set TTL for temporary table is not allowed

It seems that the create temporary table like is the only issue.

[YangKeao]

/ok-to-test

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 71.5885%. Comparing base (7dea15e) to head (2cc6edd).
⚠️ Report is 51 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65246        +/-   ##
================================================
+ Coverage   70.7643%   71.5885%   +0.8241%     
================================================
  Files          1901       1906         +5     
  Lines        518640     527459      +8819     
================================================
+ Hits         367012     377600     +10588     
+ Misses       127111     125408      -1703     
+ Partials      24517      24451        -66     

Flag	Coverage Δ
integration	48.2342% <78.5714%> (+0.0674%)	⬆️
unit	66.0548% <50.0000%> (+0.5110%)	⬆️

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

Components	Coverage Δ
dumpling	52.8700% <ø> (ø)
parser	∅ <ø> (∅)
br	59.2026% <ø> (+0.9679%)	⬆️

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[YangKeao]

LGTM

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: GMHDBJD, YangKeao

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Details

Needs approval from an approver in each of these files:

• OWNERS [GMHDBJD,YangKeao]
• pkg/ddl/OWNERS [GMHDBJD]

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:

• 2025-12-30 12:11:45.532042678 +0000 UTC m=+99461.350351100: ☑️ agreed by YangKeao.
• 2025-12-31 06:25:37.263655148 +0000 UTC m=+165093.081963579: ☑️ agreed by GMHDBJD.

[hawkingrei]

/retest

[YangKeao]

/retest

[YangKeao]

/retest

[YangKeao]

/retest

[YangKeao]

/retest

[YangKeao]

/retest