@Test
    public void testSplitDanglingKey2() {
        Map<String, String> kvMap = splitKv("f1&f2=3", '&', '=',
                null, null);
    }
Unit tests for kv splitting and concating.
inlong-sort/sort-formats/format-rowdata/format-rowdata-kv/src/test/java/org/apache/inlong/sort/formats/kv/KvUtilsTest.java