title: KSQL STRUCT Fields For TIMESTAMP
body: <p>is there are a way to make this work</p>
  
  <p>JSON DATA</p>
  
  <pre><code>"Header": {
      "StoreID": 10225,
      "BusinessDate": "2019-05-03",
      "PeriodBusinessDate": "2019-05-03",
      "ProcessMode": "Partial"
    }
  </code></pre>
  
  <p>I try this but is give me : 
  No column with the provided timestamp column name in the WITH clause, <code>HEADER-&gt;BUSINESSDATE</code>, exists in the defined schema.</p>
  
  <pre><code>CREATE STREAM test2 (HEADER STRUCT&lt;StoreID int,BusinessDate VARCHAR&gt;) WITH (KAFKA_TOPIC='hermes__output__tfrema__v1',VALUE_FORMAT='JSON',
  timestamp='HEADER-&gt;BusinessDate',timestamp_format='yyyy-MMM-dd');
  </code></pre>