planner: outer join elimination doesn't consider the ORDER BY items from the agg func

[winoros]

What problem does this PR solve?

Issue Number: close #18216

Problem Summary:

Outer join is wrongly eliminated since we don't take the ORDER BY items from the GROUP_CONCAT.

What is changed and how it works?

Add it.

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.

Fix the issue that GROUP CONCAT with ORDER BY might fail when the ORDER BY clause contains a correlated subquery.

[ti-chi-bot]

[REVIEW NOTIFICATION]

This pull request has been approved by:

• AilinKid
• time-and-fate

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[AilinKid]

LGTM

[winoros]

/merge

[ti-chi-bot]

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

Commit hash: 0994fa6

[ti-chi-bot]

In response to a cherrypick label: cannot checkout 6.1: error checking out 6.1: exit status 1. output: error: pathspec '6.1' did not match any file(s) known to git

[winoros]

/run-cherry-picker release-6.1

[winoros]

/cherry-pick release-6.1

[ti-chi-bot]

@winoros: new pull request created: #38385.

In response to this:

/cherry-pick release-6.1

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