kaka11chen opened a new pull request, #60186:
URL: https://github.com/apache/doris/pull/60186
### What problem does this PR solve?
Problem Summary:
### Release note
[Fix] (file-scanner) Fix query result is incorrect when non-deterministic
func push down.
- After `rand()` is pushed down to the ORC FileScan, it becomes a ScanNode
conjunct. Since `rand() < 1` has no column references,
`VFileScanner::_process_conjuncts_for_dict_filter` hits `slot_ids.size() == 0
`and returns early.
- This early return prevents later predicates from being processed;
immediately after, `_process_late_arrival_conjuncts` calls
`_discard_conjuncts()` and clears the original predicates. As a result,
predicates like `xxx IS NOT NULL` are dropped.
- Once dropped, the Parquet/ORC reader only applies the “earlier processed”
predicates for filtering, so rows with `xxx = NULL `appear.
Therefore, the rand() pushdown triggers the early return in predicate
handling, which discards other filters. That’s why NULLs only show up when
rand() is pushed down.
### 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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