title: How can I send data without schema to kafka - confluent jdbc - sink usage?
body: <p>I load my data from kafka to oracle with conluent jdbc-sink.</p>
  
  <p>But I write my schema on value with data.</p>
  
  <p>I do not want to write schema with data , how can I write schema on kafka topic and then I want to send just data from my client?</p>
  
  <p>thanks in advance</p>
  
  <p><strong>json data</strong></p>
  
  <pre><code>{
      "schema": {
          "type": "struct",
          "fields": [
              {
                  "field": 'ID',
                  "type": "int32",
                  "optional": False
              },
              {
                  "field": 'PRODUCT',
                  "type": "string",
                  "optional": True
              },
              {
                  "field": 'QUANTITY',
                  "type": "int32",
                  "optional": True
              },
              {
                  "field": 'PRICE',
                  "type": "int32",
                  "optional": True
              }
          ],
          "optional": True,
          "name": "myrecord"
      },
      "payload": {
          "ID": 1071,
          "PRODUCT": 'ersin',
          "QUANTITIY": 1071,
          "PRICE": 1453
     }
  </code></pre>
  
  <p><strong>python code:</strong></p>
  
  <pre><code>producer.send(topic, key=b'1071'
                , value=json.dumps(v, default=json_util.default).encode('utf-8'))
  </code></pre>
  
  <p>how can I solve this?</p>
  
  <p>thanks in advance</p>