@Test(expected = IllegalArgumentException.class)
    public void testConcatNoEscapingAndQuoting() {
        concatKv(
                new String[]{"f1", "f2", "f3", "f4"},
                new String[]{"&a", "&b", "&c", "&d"},
                '&', '=', null, null);
    }
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