fix: Add custom nullability for Spark ILIKE function #19206
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The ILIKE function was using the default is_nullable which always returns true. This fix implements custom nullability logic where the result is nullable if any of the input arguments is nullable. This matches Spark's behavior where ILIKE(NULL, pattern) or ILIKE(str, NULL) returns NULL. Changes: - Implemented return_field_from_args() to handle custom nullability - Updated return_type() to use internal_err! pattern - Added comprehensive nullability tests Fixes apache#19174
comphead
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Dec 8, 2025
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Thanks @Eshaan-byte the PR makes sense IMO
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Fixes #19174
This PR adds custom nullability handling for the Spark ILIKE function. Previously, the function was using the default
is_nullablewhich always returnstrue, which is not correct.Changes
return_field_from_args()to handle custom nullability logicILIKE(NULL, pattern)orILIKE(str, NULL)returnsNULLreturn_type()to useinternal_err!pattern to enforce use ofreturn_field_from_argsTest Plan
All existing tests pass:
running 2 tests test function::string::ilike::tests::test_ilike_nullability ... ok test function::string::ilike::tests::test_ilike_invoke ... ok test result: ok. 2 passed; 0 failed; 0 ignored
The implementation follows the same pattern used by other Spark functions in the codebase (like
shuffleandarray)