Slow extendedconfirmeds on enwiki

This query is marked as a draft This query has been published by Tamzin.

SQL

SELECT user_name, user_registration, log_timestamp, log_timestamp - user_registration AS time_between
FROM logging
	INNER JOIN user ON user_name = REPLACE(log_title, "_", " ")
WHERE log_type = "rights"
	AND REGEXP_SUBSTR(LOG_PARAMS, 'oldgroups";a:\\d+:\\K.*?\\}') NOT LIKE "%extendedconfirmed%"
	AND REGEXP_SUBSTR(LOG_PARAMS, 'newgroups";a:\\d+:\\K.*?\\}') LIKE "%extendedconfirmed%"
ORDER BY 4 DESC

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