"lookup on test where test.flag == true yield 1|yeild(count(*)) " can support PushFilterDownAggregate ？

[cl-2048]

Introduction
when i use index to count tag with filter condition , dashboard indicated one graphd service mem increased high to 80%;
"lookup on test where test.flag == true yield id(vertex)|yeild(count())"
the graphd service collect all id(vertex) to one instance,it means "lookup |count" is unsafe ;
can optimize "lookup where yield id(vertex)|yield count()" by pushdown count to storage?
maybe to use "lookup on test where test.flag==true yield count(*) " instead;
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Related work