planner: fix group_concat function couldn't resolve the index of its order-by item (#46419)

[ti-chi-bot]

This is an automated cherry-pick of #46419

What problem does this PR solve?

Issue Number: close #41986

Problem Summary:

What is changed and how it works?

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

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

planner: fix group_concat function couldn't resolve the index of its order-by item

[ti-chi-bot]

This cherry pick PR is for a release branch and has not yet been approved by release team.
Adding the do-not-merge/cherry-pick-not-approved label.

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[AilinKid]

/test unit-test

[tiprow]

@AilinKid: No presubmit jobs available for pingcap/[email protected]

In response to this:

/test unit-test

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: AilinKid, qw4990

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-10-30 07:57:19.416251289 +0000 UTC m=+2853437.003361428: ☑️ agreed by AilinKid.
• 2023-10-30 09:59:41.471381494 +0000 UTC m=+2860779.058491639: ☑️ agreed by qw4990.

[codecov]

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