zhishengyk opened a new pull request, #59367:
URL: https://github.com/apache/doris/pull/59367
Description
Add `hamming_distance` function to calculate the Hamming distance between
two strings.
Changes
- BE: Implement `hamming_distance` in `function_string.cpp` with
`FunctionBinaryToType + HammingDistanceImpl`,
and raise an error when the two input strings have different lengths
instead of returning NULL.
- FE: Add `HammingDistance` scalar function in Nereids with `AlwaysNullable`
(returns NULL when any input is NULL).
- Test: Add BE-UT with `check_function_all_arg_comb` to cover all argument
combinations.
- Test: Add distributed regression test `test_hamming_distance.groovy`.
- Doc: [link to your doc PR in apache/doris-website].
Behavior
- Return type: BIGINT, the number of positions where corresponding
characters differ.
- Returns NULL if any input is NULL.
- Throws an error if the two strings have different lengths.
- Works for vector/vector, scalar/vector, vector/scalar, scalar/scalar
combinations.
Testing
- BE-UT: `./run-be-ut.sh` (pass).
- Regression: `./run-regression-test.sh --run test_hamming_distance` (pass).
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