mrhhsg opened a new pull request, #63579:
URL: https://github.com/apache/doris/pull/63579
### What problem does this PR solve?
Issue Number: None
Problem Summary: JSON modify functions build a parent path by iterating to
the element before the last JSON path leg. The loop used `get_leg_vector_size()
- 1` on an unsigned size, which can underflow for an empty path expression even
though normal root-path execution resolves to the root value before that
branch. This patch caches the leg count once, asserts the non-empty invariant
for the insert-parent branch, and uses `j + 1 < legs_count` to avoid unsigned
subtraction while preserving behavior.
### Release note
None
### Check List (For Author)
- Test:
- Manual test: `git diff --check`
- Manual test: `DORIS_HOME=/mnt/disk7/hushenggang/doris-fix-spill ninja
-C be/ut_build_ASAN -j 1
src/exprs/CMakeFiles/Exprs.dir/function/function_jsonb.cpp.o`
- Behavior changed: No
- Does this need documentation: No
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