Add $filter support to Planner Graph Api
At the moment even though it validates the fields in the $filter parameter... the graph api does not apply the filter. This means filters need to be applied client side and will be highly inefficient on plans with numerous tasks.
This should be supported as we can get only whats been required.
Syed Hasan Abbas commented
Yes, I totally agree with this idea and if you try to use graph api for planner it still doesn't have filtering support.