[jira] [Created] (KAFKA-5972) Flatten SMT does not work with null values

["Tomas Zuklys (JIRA)" <ji...@apache.org>]

Tomas Zuklys created KAFKA-5972:
-----------------------------------

             Summary: Flatten SMT does not work with null values
                 Key: KAFKA-5972
                 URL: https://issues.apache.org/jira/browse/KAFKA-5972
             Project: Kafka
          Issue Type: Bug
          Components: KafkaConnect
    Affects Versions: 0.11.0.0
            Reporter: Tomas Zuklys
            Priority: Minor
         Attachments: kafka-transforms.patch

Hi,

I noticed a bug in Flatten SMT while doing tests with different SMTs that are provided out-of-box.

Flatten SMT does not work as expected with schemaless JSON that has properties with null values. 

Example json:
{code}
  {A={D=dValue, B=null, C=cValue}}
{code}

The issue is in if statement that checks for null value.
Current version:
{code}
  for (Map.Entry<String, Object> entry : originalRecord.entrySet()) {
            final String fieldName = fieldName(fieldNamePrefix, entry.getKey());
            Object value = entry.getValue();
            if (value == null) {
                newRecord.put(fieldName(fieldNamePrefix, entry.getKey()), null);
                return;
            }
...
{code}
should be
{code}
  for (Map.Entry<String, Object> entry : originalRecord.entrySet()) {
            final String fieldName = fieldName(fieldNamePrefix, entry.getKey());
            Object value = entry.getValue();
            if (value == null) {
                newRecord.put(fieldName(fieldNamePrefix, entry.getKey()), null);
                continue;
            }
{code}

I have attached a patch containing the fix for this issue.



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