uniqueConversionsPerVariation.sql

WITH tbl_events AS (
  SELECT e.*, t.exp.experiment_id, t.exp.variation_id
  FROM events e
  CROSS JOIN UNNEST(e.experiments) AS t(exp)
  WHERE t.exp.experiment_id = '24298220083'
    AND e.entity_id = '24209830080'
    AND e.timestamp BETWEEN TIMESTAMP '2023-05-18 18:13:00' AND TIMESTAMP '2023-05-25 14:09:10'
),
dec_tbl AS (
  SELECT visitor_id, experiment_id, timestamp
  FROM decisions
  WHERE experiment_id = '24298220083'
    AND timestamp BETWEEN TIMESTAMP '2023-05-18 18:13:00' AND TIMESTAMP '2023-05-25 14:09:10'
)

SELECT tbl_events.variation_id, 
COUNT(DISTINCT tbl_events.visitor_id) AS variation_unique_visitors
FROM tbl_events
JOIN dec_tbl ON tbl_events.visitor_id = dec_tbl.visitor_id
  AND tbl_events.experiment_id = dec_tbl.experiment_id
  AND dec_tbl.timestamp < tbl_events.timestamp
GROUP BY tbl_events.variation_id;