zhishengyk opened a new pull request, #59014:
URL: https://github.com/apache/doris/pull/59014
## Description
Add `hamming_distance` function to calculate Hamming distance between two
strings.
## Changes
- **BE**: Add implementation in `function_string.cpp` with vectorized
execution
- **FE**: Add `HammingDistance.java` with `AlwaysNullable` (returns NULL if
strings have different lengths)
- **Test**: Add BE-UT test with `check_function_all_arg_comb` covering all
argument combinations
- **Test**: Add distributed regression test
## Behavior
- Returns BIGINT: the number of positions where corresponding characters
differ
- Returns NULL if:
- Either input is NULL
- The two strings have different lengths
## Documentation
Documentation PR: [link to your doc PR]
## Testing
- BE-UT: `check_function_all_arg_comb` covers all argument combinations
(vector_vector, scalar_vector, vector_scalar, scalar_scalar)
- Regression test: `test_hamming_distance.groovy` covers various scenarios
including NULL handling and different-length strings
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