<div class="WordSection1"><p class="MsoNormal">Hi, guys.<p class="MsoNormal"> <p class="MsoNormal">Here is my task
situation:<pclass="MsoNormal">I have a TupleTableSlot, with its own TupleDesc. Now I want to extract several attributes
toform a new TupleTableSlot, how can I define my own TupleDesc and the ProjectionInfo?<p class="MsoNormal"> <p
class="MsoNormal">Best.</div>