xy720 opened a new pull request, #66981:
URL: https://github.com/apache/doris/pull/66981
### What problem does this PR solve?
e.g.
For a constant CTE like:
WITH c AS (SELECT '2026-01-01' AS s, '2026-08-17' AS e)
SELECT * FROM t WHERE t.dt BETWEEN (SELECT s FROM c) AND (SELECT e
FROM c)
or:
WITH c AS (SELECT 1 AS a)
SELECT * FROM big_tbl CROSS JOIN c WHERE big_tbl.k = c.a
the constants get stuck behind the CTEProducer and the join degrades to a
NestedLoopJoin:
<img width="1591" height="934" alt="Clipboard_Screenshot_1787210156"
src="https://github.com/user-attachments/assets/ca7bbf12-16d3-4427-bca0-8ca9db70b51e";
/>
Always inline such CTEs so the constants can be pushed down as scan
predicates.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] 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:
- [x] No.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [x] No.
- [ ] Yes. <!-- Add document PR link here. eg:
https://github.com/apache/doris-website/pull/1214 -->
### 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 -->
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