Larborator opened a new pull request, #63889:
URL: https://github.com/apache/doris/pull/63889
### What problem does this PR solve?
Issue Number: close #63887
Problem Summary:
Fix null pointer dereference (SIGSEGV) in
`ScalarColumnReader::gen_filter_map` when reading nested type columns
(Struct/Array/Map) from Parquet-based external tables.
When a predicate filters out all rows in a RowGroup, `FilterMap` is
initialized with `filter_all=true` and `_filter_map_data=nullptr`. The
`_read_nested_column` function only checks `has_filter()` before calling
`gen_filter_map`, which dereferences `filter_map_data()` unconditionally —
causing a crash.
Fix: add a `filter_all()` check before calling `gen_filter_map`. When
`filter_all` is true, directly construct an all-zero nested filter map with
`filter_all=true` propagation. This is logically equivalent to what
`gen_filter_map` would produce with valid all-zero filter data — both correctly
discard all data from the RowGroup.
### Release note
Fix BE crash (SIGSEGV) when querying Parquet-based external tables
(Paimon/Hive/Iceberg) with nested type columns under lazy read, if predicates
filter out all rows in a RowGroup.
### Check List (For Author)
- Test
- [ ] Regression test
- [x] Unit Test
- [x] 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
**Manual test**: Verified with standalone program simulating
`gen_filter_map` logic — crashes without fix, passes with fix.
**Unit test**: Added `test_filter_all_nullptr_nested_filter_map` and
`test_all_zero_filter_nested_filter_map` in `parquet_common_test.cpp`.
- Behavior changed:
- [x] No.
- [ ] Yes.
- Does this need documentation?
- [x] No.
- [ ] Yes.
### Check List (For Reviewer who merge this PR)
- [ ] Confirm the release note
- [ ] Confirm test cases
- [ ] Confirm document
- [ ] Add branch pick label
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