Revert "ddl: fix create partition table error under NO_UNSIGNED_SUBTRACTION" (#26935)

[ti-srebot]

cherry-pick #26935 to release-5.1
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/27053

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---

Reverts #25435

What problem does this PR solve?

Problem Summary:

the PR introduces a bug #26765, it fixes a corner case but breaks a more common case. I am gonna revert PR #25435 and document the bad case in the issues #24880. see #25437 (comment) for more details.

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 bug that creates partition fail if `NO_UNSIGNED_SUBTRACTION` is set.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• qw4990
• xhebox

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[ti-srebot]

/run-all-tests

[ti-srebot]

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

[xiongjiwei]

/run-unit-test

[zhouqiang-cl]

/merge

[ti-chi-bot]

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

Commit hash: 38e810a

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