englefly opened a new pull request, #62315:
URL: https://github.com/apache/doris/pull/62315
…
### What problem does this PR solve?
Issue Number: close #xxx
Problem Summary: StringEmptyToLengthRule only rewrites `str_col = ''` to
`length(str_col) = 0` when the non-literal side is a direct SlotReference. This
means expressions like `element_at(struct_col, 'f3') = ''` (which becomes
`struct_element(struct_col, 'f3') = ''` after analysis) are not rewritten,
preventing the OFFSET-only column reading optimization from applying to struct
string fields.
### Release note
StringEmptyToLengthRule now rewrites any string-typed expression compared
against an empty string literal, not just direct column references. This
enables the OFFSET optimization for struct field access patterns like
`element_at(struct_col, 'f3') = ''`.
### Check List (For Author)
- Test: Unit Test + Regression test
- Behavior changed: No
- Does this need documentation: No
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [ ] Regression test
- [ ] 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.
- [ ] Yes. <!-- Explain the behavior change -->
- Does this need documentation?
- [ ] 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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