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