planner/core: fix a panic when select for update on join partition table with normal table (#26373)

[ti-srebot]

cherry-pick #26373 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/26563

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git push git@github.com:ti-srebot/tidb.git pr/26563:release-5.1-0c7f9ac3dbb7

---

What problem does this PR solve?

Issue Number: close #26250

Problem Summary:

What is changed and how it works?

What's Changed:

Add extra partition column do not consider the case when the DataSource is not a partition table.

How it Works:

Do not add extra partition column when the table is not a partitioned table.

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

• Fix a panic when select for update on a normal table join a partition table

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• rebelice

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[ti-srebot]

/run-all-tests

[ti-srebot]

@tiancaiamao you're already a collaborator in bot's repo.

[tiancaiamao]

PTAL @zhuo-zhi @qw4990

[zhouqiang-cl]

/merge

[ti-chi-bot]

This pull request has been accepted and is ready to merge.

Commit hash: 6c63b08

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