title: Kafka JDBC Source connector Insert or Update
body: <p>I configured a Kafka JDBC Source connector in order to push on a Kafka topic the record changed (insert or update) from a PostgreSQL database.
  I use &quot;timestamp+incrementing&quot; mode. Seems to work fine.
  I didnt't configure the JDBC Sink connector because I'm using a Kafka Consumer that listen on the topic.</p>
  <p>The message on the topic is a JSON. This is an example:</p>
  <pre><code>{
    &quot;schema&quot;: {
      &quot;type&quot;: &quot;struct&quot;,
      &quot;fields&quot;: [
        {
          &quot;type&quot;: &quot;int64&quot;,
          &quot;optional&quot;: false,
          &quot;field&quot;: &quot;id&quot;
        },
        {
          &quot;type&quot;: &quot;int64&quot;,
          &quot;optional&quot;: true,
          &quot;name&quot;: &quot;org.apache.kafka.connect.data.Timestamp&quot;,
          &quot;version&quot;: 1,
          &quot;field&quot;: &quot;entity_create_date&quot;
        },
        {
          &quot;type&quot;: &quot;int64&quot;,
          &quot;optional&quot;: true,
          &quot;name&quot;: &quot;org.apache.kafka.connect.data.Timestamp&quot;,
          &quot;version&quot;: 1,
          &quot;field&quot;: &quot;entity_modify_date&quot;
        },
        {
          &quot;type&quot;: &quot;int32&quot;,
          &quot;optional&quot;: true,
          &quot;field&quot;: &quot;entity_version&quot;
        },
        {
          &quot;type&quot;: &quot;string&quot;,
          &quot;optional&quot;: true,
          &quot;field&quot;: &quot;firstname&quot;
        },
        {
          &quot;type&quot;: &quot;string&quot;,
          &quot;optional&quot;: true,
          &quot;field&quot;: &quot;lastname&quot;
        }
      ],
      &quot;optional&quot;: false,
      &quot;name&quot;: &quot;author&quot;
    },
    &quot;payload&quot;: {
      &quot;id&quot;: 1,
      &quot;entity_create_date&quot;: 1600287236682,
      &quot;entity_modify_date&quot;: 1600287236682,
      &quot;entity_version&quot;: 1,
      &quot;firstname&quot;: &quot;George&quot;,
      &quot;lastname&quot;: &quot;Orwell&quot;
    }
  }
  </code></pre>
  <p>As you can see there is no info about if this change is captured by Source connector because of an insert or an update.
  I need this information. How can solve?</p>