wenzhenghu opened a new pull request, #61803:
URL: https://github.com/apache/doris/pull/61803
### What problem does this PR solve?
Problem Summary:
When querying a Paimon table with a condition that cannot be pushed down
(e.g., `LIKE '%*%'`), if a single `VFileScanner` instance processes both Native
splits (Parquet/ORC) and JNI splits consecutively, the data returned by the JNI
reader will skip the fallback filtering at the `VScanner` layer, resulting in
dirty data leaking into the final result.
Root Cause:
1. When `VFileScanner` prepares to read a Native split, it calls
`_process_late_arrival_conjuncts()` to clone `_conjuncts` into
`_push_down_conjuncts`.
2. However, it mistakenly called `_discard_conjuncts()` at the end of this
function, clearing the shared fallback `_conjuncts` at the scanner level.
3. When the scanner subsequently processes a JNI split (which does not
trigger the push-down logic), `VScanner::_filter_output_block()` finds
`_conjuncts` is empty, causing predicates like `LIKE` to be completely bypassed.
Solution:
Remove the `_discard_conjuncts()` call in
`_process_late_arrival_conjuncts()`. This ensures that `_conjuncts` is always
retained as the final fallback filter at the `VScanner` level, regardless of
how underlying readers execute their own push-down predicates.
Added a BE unit test `process_late_arrival_conjuncts_retain` to prevent
regression.
### Release note
Fix a correctness issue where complex string predicates (like `LIKE`) might
fail to filter dirty data when querying Paimon tables with mixed native and JNI
splits.
### 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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