mrhhsg opened a new pull request, #68427:
URL: https://github.com/apache/doris/pull/68427
### What problem does this PR solve?
Issue Number: None
Problem Summary:
`json_length` and `json_contains` unpack constant path columns before row
iteration, but used the current row index when reading the nullable path's
one-row null map. For a multi-row block, rows after the first therefore read
past the constant payload and could return incorrect `NULL` values or fail.
This change uses the constant-aware row index for nullable-path checks and
adds focused multi-row unit and SQL regression coverage for both functions.
### Release note
Fix incorrect `NULL` results from `json_length` and `json_contains` when a
non-null nullable JSON path is constant across multiple rows.
### Check List (For Author)
- Test:
- Unit Test: `./run-be-ut.sh --run --filter='FunctionJsonbTEST.*' -j 16`
(17 tests passed)
- Regression test: `test_json_const_nullable_path`
- ASAN FE/BE build
- Behavior changed: Yes. Constant nullable JSON paths now return the correct
value for every row.
- Does this need documentation: No
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