@Test
    public void testSplitNestedValue() {
        Map<String, String> kvMap = splitKv("f1=a=a&f2=b&f3=c", '&', '=',
                '\\', '\"');
        Assert.assertEquals("a=a", kvMap.get("f1"));
    }
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