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branch-4.1: [fix](function) Reject a non-constant seed in array_shuffle #68438 - #68832

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@github-actions github-actions Bot commented Oct 9, 2026

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Cherry-picked from #68438

### What problem does this PR solve?

Issue Number: None

Related PR: #44901

Problem Summary:

1. `array_shuffle` now rejects a non-constant seed, which was silently
ignored for every row but the first one of each block.
2. The seed now uses all 64 bits (`std::mt19937_64`), so any BIGINT seed
works, including a negative one, which failed with an out-of-range error
since #44901.
3. Every row is now shuffled on its own, so a constant array no longer
gets the same order on every row, and blocks without a seed no longer
repeat each other.

doc: apache/doris-website#4176

### Release note

`array_shuffle` / `shuffle` rejects a non-constant seed, uses all 64
bits of the seed (so the order for a given seed changes), and shuffles
every row on its own.


### Check List (For Author)

- Test <!-- At least one of them must be included. -->
    - [x] Regression test
    - [x] Unit Test
    - [ ] Manual test (add detailed scripts or steps below)
    - [ ] No need to test or manual test. Explain why:
- [ ] This is a refactor/code format and no logic has been changed.
        - [ ] Previous test can cover this change.
        - [ ] No code files have been changed.
        - [ ] Other reason <!-- Add your reason?  -->

- Behavior changed:
    - [ ] No.
    - [x] Yes. See the three points above.

- Does this need documentation?
    - [ ] No.
    - [x] Yes. <!-- apache/doris-website PR link to be added -->

### Check List (For Reviewer who merge this PR)

- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label <!-- Add branch pick label that this PR
should merge into -->

---------

Co-authored-by: Claude Opus 5.5 (1M context) <[email protected]>
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github-actions Bot requested a review from yiguolei as a code owner October 9, 2026 10:12
@hello-stephen

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Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

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

@hello-stephen

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BE Regression && UT Coverage Report

Increment line coverage 100.00% (17/17) 🎉

Increment coverage report
Complete coverage report

Category Coverage
Function Coverage 75.01% (31996/42656)
Line Coverage 59.41% (358777/603949)
Region Coverage 56.13% (299280/533187)
Branch Coverage 56.98% (135650/238068)

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FE Regression Coverage Report

Increment line coverage 87.50% (7/8) 🎉
Increment coverage report
Complete coverage report

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PR approved by anyone and no changes requested.

@github-actions github-actions Bot added the approved Indicates a PR has been approved by one committer. label Oct 10, 2026
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PR approved by at least one committer and no changes requested.

@yiguolei
yiguolei merged commit 0152b04 into branch-4.1 Oct 10, 2026
35 of 36 checks passed
yiguolei pushed a commit that referenced this pull request Oct 10, 2026
#68438 (#68832)

Cherry-picked from #68438

Co-authored-by: Chenyang Sun <[email protected]>
Co-authored-by: Claude Opus 5.5 (1M context) <[email protected]>
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3 participants