planner: fix bug caused by wrong column indice in NominalSort's sort item (#31324)

[ti-srebot]

cherry-pick #31324 to release-5.2
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# In tidb repo:
git pr https://github.com/pingcap/tidb/pull/31500

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---

Signed-off-by: guo-shaoge shaoge1994@163.com

What problem does this PR solve?

Issue Number: close #31035

Problem Summary: TiDB panic because column indice is wrong.

1. NominalSort's sort item is COL2 + 9843176, COL2's indice is wrong, it should be 1, but we got 0.
2. NominalSort is converted to Projection in InjectExtraProjection
3. In (*defaultEvaluator).run, we use the wrong col index(0) to evaluate COL2 + 9843176.(col index 0 is text type, but col2 is decimal, that's why tidb panic when decode mydecimal)

What is changed and how it works?

Also resolve indice for NominalSort.

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

planner: fix bug caused by wrong column index in NominalSort's sort item

[ti-chi-bot]

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[ti-srebot]

/run-all-tests

[ti-srebot]

@guo-shaoge you're already a collaborator in bot's repo.

[VelocityLight]

This pull request is closed because it's related version has closed automatic cherry-picking.
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