herunkang2018 commented on code in PR #3330:
URL: https://github.com/apache/calcite/pull/3330#discussion_r1278477675
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testkit/src/main/java/org/apache/calcite/test/SqlOperatorTest.java:
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@@ -4320,6 +4320,23 @@ static void checkRlikeFails(SqlOperatorFixture f) {
f0.forEachLibrary(list(SqlLibrary.BIG_QUERY, SqlLibrary.MYSQL), consumer);
}
+ @Test void testLevenshtein() {
+ final SqlOperatorFixture f0 =
fixture().setFor(SqlLibraryOperators.LEVENSHTEIN);
+ f0.checkFails("^levenshtein('abc', 'abc')^",
+ "No match found for function signature LEVENSHTEIN\\(<CHARACTER>,
<CHARACTER>\\)",
+ false);
+ final Consumer<SqlOperatorFixture> consumer = f -> {
+ f.checkScalar("levenshtein('', '')", 0, "INTEGER NOT NULL");
+ f.checkScalar("levenshtein('abc', 'abc')", 0, "INTEGER NOT NULL");
+ f.checkScalar("levenshtein('kitten', 'sitting')", 3, "INTEGER NOT NULL");
+ f.checkScalar("levenshtein('frog', 'fog')", 1, "INTEGER NOT NULL");
+ f.checkScalar("levenshtein(_UTF8'\u4F60\u597D',
_UTF8'\u4F60\u5F88\u597D')",
+ 1, "INTEGER NOT NULL");
Review Comment:
It will return null, I will add a test case for it.
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