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<pre class="methodSignature">public&nbsp;<a href="UnionCommand.html" title="class in hydra.ext.com.microsoft.kusto.kql">UnionCommand</a>&nbsp;withWithSource&#8203;(hydra.util.Opt&lt;<a href="ColumnName.html" title="class in hydra.ext.com.microsoft.kusto.kql">ColumnName</a>&gt;&nbsp;withSource)</pre>
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