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https://issues.apache.org/jira/browse/NIFI-4857?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16409617#comment-16409617
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ASF GitHub Bot commented on NIFI-4857:
--------------------------------------

Github user markap14 commented on a diff in the pull request:

    https://github.com/apache/nifi/pull/2570#discussion_r176437638
  
    --- Diff: 
nifi-commons/nifi-record/src/main/java/org/apache/nifi/serialization/record/util/DataTypeUtils.java
 ---
    @@ -1100,4 +1189,16 @@ public static boolean isScalarValue(final DataType 
dataType, final Object value)
     
             return true;
         }
    +
    +    public static Charset getCharset(String charsetName) {
    +        if(charsetName == null) {
    +            return StandardCharsets.UTF_8;
    +        } else {
    +            try {
    +                return Charset.forName(charsetName);
    +            } catch(Exception e) {
    --- End diff --
    
    If given an invalid character set, I think I would prefer to just throw the 
Exception. If there is a typo somewhere, this can lead to some very unexpected 
results that are difficult to track down.


> Record components do not support String <-> byte[] conversions
> --------------------------------------------------------------
>
>                 Key: NIFI-4857
>                 URL: https://issues.apache.org/jira/browse/NIFI-4857
>             Project: Apache NiFi
>          Issue Type: Improvement
>          Components: Extensions
>            Reporter: Matt Burgess
>            Assignee: Matt Burgess
>            Priority: Major
>
> When trying to perform a conversion of a field between a String and a byte 
> array, various errors are reporting (depending on where the conversion is 
> taking place). Here are some examples:
> 1) CSVReader, if a column with String values is specified in the schema as 
> "bytes"
> 2) ConvertRecord, if an input field is of type String and the output field is 
> of type "bytes"
> 3) ConvertRecord, if an input field is of type "bytes" and the output field 
> is of type "String"
> Many/most/all of the record components use utility methods to convert values, 
> I believe these methods need to be updated to support conversion between 
> String and byte[] values.
>  



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