LogicalInsert(target=[dst], partitionedBy=[ALL TIME], clusteredBy=[<none>])
  LogicalProject(inputs=[0..2])
    ExternalTableScan(dataSource=[{"type":"external","inputSource":{"type":"http","uris":["http://foo.com/bar.csv"],"httpAuthenticationUsername":"bob","httpAuthenticationPassword":{"type":"default","password":"secret"},"requestHeaders":{}},"inputFormat":{"type":"csv","columns":["x","y","z"]},"signature":[{"name":"x","type":"STRING"},{"name":"y","type":"STRING"},{"name":"z","type":"LONG"}]}])
