fix(plan): support subqueries in left and right join ON clauses

[iamlinjunhong]

What type of PR is this?

• API-change
• BUG
• Improvement
• Documentation
• Feature
• Test and CI
• Code Refactoring

Which issue(s) this PR fixes:

issue #25973

What this PR does / why we need it:

fix(plan): support subqueries in left and right join ON clauses

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[aunjgr]

Reviewed exact head 22decfb after the successful CI rollup. The left/right JOIN ON decorrelation preserves the outer join and row-preserving child semantics, and rejects unsupported cross-side correlations.

[mergify]

Queued — the merge queue status continues in this comment ↓.

[mergify]

Merge Queue Status

• ✅ Entered queue — 2026-08-10 06:48 UTC · Rule: main · triggered by @iamlinjunhong with the merge queue checkbox
• ✅ Checks passed · in-place
• ✅ Merged — 2026-08-10 07:30 UTC · at 3d0d76b93e2c3ac580014ff0534b4489af1fde8d · squash

This pull request spent 41 minutes 58 seconds in the queue, including 40 minutes 55 seconds running CI.

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