cloud-fan commented on code in PR #39747:
URL: https://github.com/apache/spark/pull/39747#discussion_r1090383764
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sql/core/src/test/resources/sql-tests/inputs/string-functions.sql:
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@@ -231,3 +231,42 @@ CREATE TEMPORARY VIEW fmtTable(fmtField) AS SELECT * FROM
VALUES ('invalidFormat
SELECT to_binary('abc', fmtField) FROM fmtTable;
-- Clean up
DROP VIEW IF EXISTS fmtTable;
+-- luhn_check
+select luhn_check('4111111111111111');
+select luhn_check('4111111111111111 ');
+select luhn_check('5500000000000004');
+select luhn_check('340000000000009');
+select luhn_check('6011000000000004');
Review Comment:
Ideally the more tests the better, but we should also think about coverage.
The test cases I can think of
1. a few basic cases
2. spaces in the beginning/middle/end
3. non-digits
4. empty string
5. null
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