HappenLee opened a new pull request, #66442:
URL: https://github.com/apache/doris/pull/66442
### What problem does this PR solve?
Issue Number: None
Related PR: None
Problem Summary: Nullable TopN comparisons can return a `ColumnConst` that
wraps a `ColumnNullable` result, especially when an input batch is entirely
NULL. The previous normalization only handled a top-level `ColumnNullable`, so
the constant nullable result could reach filter execution without converting
SQL NULL into the NULLS FIRST or NULLS LAST filter decision.
This change recursively normalizes constant wrappers, collapses nullable
Boolean results according to the TopN null ordering, preserves the constant
shape, and aligns the unit-test expression metadata with production
nullability. The new unit test covers both NULLS FIRST and NULLS LAST through
`execute_column` and `execute_filter`.
### Release note
Fix nullable TopN runtime predicate filtering for constant NULL comparison
results.
### Check List (For Author)
- Test: Unit Test
- `GLIBC_COMPATIBILITY=OFF ./run-be-ut.sh -j 48 --run
--filter=RuntimePredicateTest.*`
- `build-support/run-clang-tidy.sh --base apache/master --build-dir
be/ut_build_ASAN`
- Behavior changed: Yes, constant nullable TopN predicate results now follow
NULLS FIRST/LAST semantics
- Does this need documentation: No
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