1  * field: equals
   2  
   3  * field__not: not equals
   4  
   5  * field__in: in list
   6  
   7  * field__notin: not in list
   8  
   9  * field__gt, field__lt: numeric comparisons
  10  
  11  *  For competitors: comp_source_store, comp_source_store__in, comp_source_store__notin
  12  
  13