title: Duplicate column name in table storage source in Azure data factory
body: <p><strong>Setup:</strong><br>
  1. I have a Azure table storage table with the following schema</p>
  
  <pre><code>PartitionKey
  RowKey
  TimeStamp [Generated By Azure table storage automatically]
  DataField1
  TimeStamp [Field added by code]
  </code></pre>
  
  <p>I have added this table as a source in my data factory.</p>
  
  <p><strong>Issue</strong><br>
  When i try to publish this data set, it gives me an error saying
  <code>The name 'TIMESTAMP' is duplicated in 2 Schema</code></p>
  
  <p>I tried removing the code generated TimeStamp in the <code>structure</code> of data. But the error still persists.</p>
  
  <p>Please do suggest any way to import this dataset.</p>