Один из потенциально многих вариантов — для BigQuery Standard SQL.
#standardSQL
SELECT tag, COUNT(1) AS popular
FROM `bigquery-public-data.stackoverflow.stackoverflow_posts`,
UNNEST(SPLIT(tags, '|')) AS tag
WHERE DATE(creation_date)
BETWEEN DATE_SUB(CURRENT_DATE(), INTERVAL 3 YEAR)
AND DATE_SUB(CURRENT_DATE(), INTERVAL 2 YEAR)
GROUP BY tag
HAVING tag LIKE '%java%'
ORDER BY popular DESC
-- LIMIT 100