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branch-4.0: [fix](fe) Reject TopN in correlated scalar subquery #64251 - #64350

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morningman merged 1 commit into
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Jun 24, 2026
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branch-4.0: [fix](fe) Reject TopN in correlated scalar subquery #64251#64350
morningman merged 1 commit into
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auto-pick-64251-branch-4.0

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Cherry-picked from #64251

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github-actions Bot requested a review from morningman as a code owner June 10, 2026 04:21
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Thank you for your contribution to Apache Doris.
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Please clearly describe your PR:

  1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
  2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
  3. What features were added. Why was this function added?
  4. Which code was refactored and why was this part of the code refactored?
  5. Which functions were optimized and what is the difference before and after the optimization?

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run buildall

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FE UT Coverage Report

Increment line coverage 83.33% (5/6) 🎉
Increment coverage report
Complete coverage report

@github-actions github-actions Bot added the approved Indicates a PR has been approved by one committer. label Jun 24, 2026
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PR approved by at least one committer and no changes requested.

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PR approved by anyone and no changes requested.

### What problem does this PR solve?

Related PR: #39471

Problem Summary:

Correlated scalar subqueries with `ORDER BY ... LIMIT 1` were treated
like plain `LIMIT 1` subqueries. Analysis eliminated the root
`LogicalLimit`, which also discarded the TopN semantics instead of
rejecting this unsupported correlated-subquery shape.

This change only eliminates a correlated scalar subquery's `LIMIT 1`
when the limit does not wrap a `LogicalSort`. A TopN remains in the
analyzed plan and is rejected by the existing correlated-subquery
validation.

FE unit and regression tests verify that `ORDER BY ... LIMIT 1` is
rejected, while the existing plain `LIMIT 1` coverage continues to
verify the supported path.

### Release note

Reject correlated scalar subqueries containing `ORDER BY` with `LIMIT 1`.
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morningman force-pushed the auto-pick-64251-branch-4.0 branch from ff257c1 to 2809faa Compare June 24, 2026 09:46
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morningman merged commit b8e71e7 into branch-4.0 Jun 24, 2026
28 of 32 checks passed
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github-actions Bot deleted the auto-pick-64251-branch-4.0 branch June 24, 2026 14:55
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3 participants