Checking existing result in memory should also be done before altering query

[darshit-shah]

1. Lets say we added a filter Qtr in [ "Q1", "Q2" ], first time it will fire a query and store result in memory
2. Now apply filter condition Qtr in [ "Q1", "Q2", "Q3" ], now it will compare it with last condition and fire query only for only "Q3" and merge new result with previous result.
3. Now apply filter condition Qtr in [ "Q1", "Q2" ], Here it starts comparing this condition with last condition and takes appropriate action. Instead first it should try to find result from existing results.