pkg/ddl: loose the pre-check for temporary table.

[bb7133]

What problem does this PR solve?

Issue Number: close #65430

Problem Summary: The current behavior(reporting errors with those attributes) is actually by-design, but now we think it's meaningful to create a temporary table for tables with SHARD_ROW_ID_BITS and PRE_SPLIT_REGIONS, as long as we ignore those 2 attributes for the temporary table.

What changed and how does it work?

Allow CREATE TEMPORARY TABLE ... LIKE to ignore SHARD_ROW_ID_BITS and PRE_SPLIT_REGIONS inherited from the source table. The preprocessor no longer rejects temp table creation when the referenced table uses sharding bits, and the table-info clone clears shard/pre-split settings for temporary tables.

Updated serial DDL tests to expect success and verify SHOW CREATE TABLE for the temporary table omits these options.

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

• NA

Documentation

• We need to update our user manual doc by removing the limitations for those 2 attributes(sql: update temp table limitation doc to align with tidb #65598 docs#22334).

Release note

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

DDL: `CREATE TEMPORARY TABLE ... LIKE` now ignores `SHARD_ROW_ID_BITS` and `PRE_SPLIT_REGIONS` from the source table, allowing temporary tables to be created successfully.

[tiprow]

@bb7133: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
fast_test_tiprow	ab34e81	link	true	/test fast_test_tiprow

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.3403%. Comparing base (8333420) to head (ab34e81).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@               Coverage Diff                @@
##             master     #65598        +/-   ##
================================================
+ Coverage   77.8487%   79.3403%   +1.4915%     
================================================
  Files          1978       1901        -77     
  Lines        542181     529853     -12328     
================================================
- Hits         422081     420387      -1694     
+ Misses       118441     108011     -10430     
+ Partials       1659       1455       -204     

Flag	Coverage Δ
integration	47.6786% <100.0000%> (-0.5113%)	⬇️

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

Components	Coverage Δ
dumpling	56.7974% <ø> (ø)
parser	∅ <ø> (∅)
br	66.3181% <ø> (+5.1755%)	⬆️

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[ti-chi-bot]

@bb7133: 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
pull-unit-test-next-gen	ab34e81	link	true	/test pull-unit-test-next-gen
idc-jenkins-ci-tidb/unit-test	ab34e81	link	true	/test unit-test
pull-unit-test-ddlv1	ab34e81	link	true	/test pull-unit-test-ddlv1

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: AilinKid, tiancaiamao
Once this PR has been reviewed and has the lgtm label, please assign benjamin2037 for approval. For more information see the Code Review Process.
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Details

Needs approval from an approver in each of these files:

• pkg/ddl/OWNERS
• pkg/planner/OWNERS [AilinKid]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-01-16 01:16:19.190897525 +0000 UTC m=+111006.804854391: ☑️ agreed by tiancaiamao.
• 2026-01-16 03:22:02.756671677 +0000 UTC m=+118550.370628533: ☑️ agreed by AilinKid.