Sets or returns the name of the field from the schema. This might be a "dotted name" if it is from within a reference (for example, owner.login_name).
Field path names are normally set on the BuildField function of the QueryDef object.
VBScript
queryfielddef.FieldPathName
queryfielddef.FieldPathName NewValue
Perl
$queryfielddef->GetFieldPathName();
$queryfielddef->SetFieldPathName(NewValue);