text: /*
     Copyright 2021 Snowplow Analytics Ltd. All rights reserved.
  
     Licensed under the Apache License, Version 2.0 (the "License");
     you may not use this file except in compliance with the License.
     You may obtain a copy of the License at
  
         http://www.apache.org/licenses/LICENSE-2.0
  
     Unless required by applicable law or agreed to in writing, software
     distributed under the License is distributed on an "AS IS" BASIS,
     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     See the License for the specific language governing permissions and
     limitations under the License.
  */
  
  
  CREATE OR REPLACE TABLE {{.scratch_schema}}.pv_engaged_time{{.entropy}}
  AS (
    SELECT
      ev.page_view_id,
      MAX(ev.derived_tstamp) AS end_tstamp,
  
      -- Aggregate pings:
      -- Divides EPOCH tstamps by heartbeat to get distinct intervals
      -- FLOOR rounds to nearest integer - duplicates all evaluate to the same number
      -- COUNT(DISTINCT) counts duplicates only once
      -- adding minimumVisitLength accounts for the page view event itself.
  
      {{.heartbeat}} * (COUNT(DISTINCT(FLOOR(DATE_PART('EPOCH_SECOND', ev.derived_tstamp)/{{.heartbeat}}))) -1) + {{.minimumVisitLength}} AS engaged_time_in_s
  
    FROM
      {{.scratch_schema}}.events_staged{{.entropy}} AS ev
  
    WHERE ev.event_name = 'page_ping'
      AND ev.page_view_id IS NOT NULL
  
    GROUP BY 1
  );
  