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

    https://github.com/apache/flink/pull/2303#discussion_r79833722
  
    --- Diff: 
flink-core/src/main/java/org/apache/flink/types/parser/FieldParser.java ---
    @@ -174,6 +174,62 @@ protected void setErrorState(ParseErrorState error) {
        public ParseErrorState getErrorState() {
                return this.errorState;
        }
    +
    +   /**
    +    * Returns the end position of a string with a numeric format (like 
XXXX-XX-XX). Sets the error state if the
    +    * string contains leading/trailing whitespaces or if the column is 
empty.
    +    *
    +    * @return the end position of the string or -1 if an error occurred
    +    */
    +   public final int formattedStringEndPos(byte[] bytes, int startPos, int 
limit, byte[] delimiter) {
    +           int len = startPos;
    +
    +           final int delimLimit = limit - delimiter.length + 1;
    +
    +           while (len < limit) {
    +                   if (len < delimLimit && delimiterNext(bytes, len, 
delimiter)) {
    +                           if (len == startPos) {
    +                                   
setErrorState(ParseErrorState.EMPTY_COLUMN);
    +                                   return -1;
    +                           }
    +                           break;
    +                   }
    +                   len++;
    +           }
    +
    +           if (len > startPos &&
    +                           (Character.isWhitespace(bytes[startPos]) || 
Character.isWhitespace(bytes[(len - 1)]))) {
    +                   
setErrorState(ParseErrorState.NUMERIC_VALUE_ILLEGAL_CHARACTER);
    +                   return -1;
    +           }
    +
    +           return len;
    +   }
    +
    +   /**
    +    * Returns a string with a numeric format (like XXXX-XX-XX). Throws an 
exception if the
    +    * string contains leading/trailing whitespaces or if the column is 
empty.
    +    *
    +    * @return the parsed string
    +    */
    +   public static final String formattedString(byte[] bytes, int startPos, 
int length, char delimiter) {
    +           if (length <= 0) {
    +                   throw new NumberFormatException("Invalid input: Empty 
string");
    +           }
    +           int i = 0;
    +           final byte delByte = (byte) delimiter;
    +
    +           while (i < length && bytes[startPos + i] != delByte) {
    +                   i++;
    +           }
    +
    +           if (i > 0 &&
    +                           (Character.isWhitespace(bytes[startPos]) || 
Character.isWhitespace(bytes[startPos + i - 1]))) {
    +                   throw new NumberFormatException("There is leading or 
trailing whitespace in the numeric field.");
    --- End diff --
    
    But it does not do anything related to numeric values or am I overlooking 
something?


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