Initialization of ResultTupleSlot in AppendNode

<div class="Section1"><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Hi All,</span></font><p class="MsoNormal"><font face="Arial" size="2"><span
style="font-size:10.0pt;
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">I observed that during initialization of planstate for Append Node, we allocate ResulttupleSlot,
howeverit is used only to send NULL slot indicate no more tuples. </span></font><p class="MsoNormal"><font face="Arial"
size="2"><spanstyle="font-size:10.0pt;
 
font-family:Arial">Is it right or there is any other purpose of it?</span></font><p class="MsoNormal"><font
face="Arial"size="2"><span style="font-size:10.0pt;
 
font-family:Arial"> </span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial">Amit</span></font><p class="MsoNormal"><font face="Arial" size="2"><span style="font-size:10.0pt;
font-family:Arial"> </span></font><p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><font
face="Arial"size="2"><span
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