title: Query on aggregate table takes longer time than the query on the raw data
body: <p>i wanted to shorten the execution time of the query, so i created a new aggregated table based on the raw data, but for some reason the original query is mach faster than the new query based on the aggregated table. 
  Both of the queries return the same results.</p>
  
  <p>Why is this happening?</p>
  
  <p>thank!</p>