Github user fhueske commented on a diff in the pull request:

    https://github.com/apache/flink/pull/5218#discussion_r159128212
  
    --- Diff: 
flink-core/src/test/java/org/apache/flink/types/parser/FieldParserTest.java ---
    @@ -43,4 +43,38 @@ public void testEndsWithDelimiter() throws Exception {
                assertFalse(FieldParser.endsWithDelimiter(bytes, 3, delim));
        }
     
    +   @Test
    +   public void testNextStringEndPos() throws Exception {
    --- End diff --
    
    It would be good if the test would cover more corner cases for 
`nextStringEndPos()`, such as
    
    - multi-char delimiter
    - field with trailing delimiter
    - field without training delimiter
    - empty field
    
    For example with test date like this
    
    ```
    byte[] bytes1 = "field1|#|field2".getBytes();
    byte[] bytes2 = "field3|#|".getBytes();
    
    byte[] delim = "|#|".getBytes();
    ```


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