LIANG751234313 opened a new pull request, #65138:
URL: https://github.com/apache/doris/pull/65138
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
When SQL contains a null literal in an inverted index predicate, such as
`col = NULL`, `MATCH_ALL NULL`, or `multi_match(col, 'phrase', NULL)`, the null
const column value can reach the BE inverted index evaluation path. The
previous code read literal arguments with `get_data_at(0)` and then converted
the returned `StringRef` to `std::string` directly. For a null value,
`ColumnNullable::get_data_at()` returns `{nullptr, 0}`, so the subsequent
string construction may crash or trigger undefined behavior.
This PR checks the literal query type and query string with `get()` before
calling `get_data_at()`. If either argument is null, the inverted index
evaluation returns an empty bitmap result, meaning the predicate matches no
rows instead of crashing.
### Release note
None
### Check List (For Author)
- Test <!-- At least one of them must be included. -->
- [x] 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:
- [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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