lib/mongoid/contextual/aggregable/mongo.rb in mongoid-5.1.5 vs lib/mongoid/contextual/aggregable/mongo.rb in mongoid-5.1.6

@@ -122,10 +122,9 @@
         #
         # @since 3.1.0
         def pipeline(field)
           db_field = "$#{database_field_name(field)}"
           pipeline = []
-          pipeline << { "$match" => criteria.selector }
           pipeline << { "$match" =>  criteria.exists(field => true).selector }
           pipeline << { "$sort" => criteria.options[:sort] } if criteria.options[:sort]
           pipeline << { "$skip" => criteria.options[:skip] } if criteria.options[:skip]
           pipeline << { "$limit" => criteria.options[:limit] } if criteria.options[:limit]
           pipeline << {