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<h4>add</h4>
<pre>public&nbsp;<a href="../../../../io/delta/standalone/types/StructType.html" title="class in io.delta.standalone.types">StructType</a>&nbsp;add(String&nbsp;fieldName,
                      <a href="../../../../io/delta/standalone/types/DataType.html" title="class in io.delta.standalone.types">DataType</a>