LogicalInsert(target=[dst], partitionedBy=[ALL TIME], clusteredBy=[<none>])
  LogicalProject(inputs=[0..2])
    ExternalTableScan(dataSource=[{"type":"external","inputSource":{"type":"local","files":["/tmp/foo.csv","/tmp/bar.csv"]},"inputFormat":{"type":"csv","columns":["x","y","z"]},"signature":[{"name":"x","type":"STRING"},{"name":"y","type":"STRING"},{"name":"z","type":"LONG"}]}])
