docs - note some aggregate and window function limitations
href="../topics/functions-operators.xml#topic29/in204913"/>.</li>
<li id="in200915">Greenplum Database does not support DISTINCT
with multiple input expressions.</li>
+ <li id="in2009151">Greenplum Database does not support specifying an
+ aggregate function as an argument to another aggregate function.</li>
+ <li id="in2009152">Greenplum Database does not support specifying a
+ window function as an argument to an aggregate function.</li>
</ul>
</body>
</topic>
value for every row, but that value is calculated with respect to the rows in a
particular window partition. If no partition is specified, the window function
is computed over the complete intermediate result set.</p>
+ <p>Greenplum Database does not support specifying a window function as an argument
+ to another window function.</p>
<p>The syntax of a window expression is:</p>
<p>
<codeblock><i>window_function</i> ( [<i>expression</i> [, ...]] ) OVER ( <i>window_specification</i> )</codeblock>
