Non-bot revisions and typed commend length average per day

SQL

SELECT
    AVG(num_revisions) AS average_num_revisions_per_day,
    AVG(avg_comment_length) AS average_avg_comment_length_per_day
FROM (
    SELECT
        date,
        COUNT(rc_timestamp) AS num_revisions,
        AVG(true_comment_length) AS avg_comment_length
    FROM (
        SELECT
            SUBSTRING(rc.rc_timestamp, 1, 8) AS date,
            rc.rc_timestamp,
            cr.comment_text,
            LENGTH(
                -- Remove /* */ comments from the comment_text
                REGEXP_REPLACE(cr.comment_text, '/\\*.*?\\*/', '') 
            ) AS true_comment_length
        FROM
            recentchanges rc
        JOIN
            comment_recentchanges cr ON rc.rc_comment_id = cr.comment_id
        WHERE
            rc.rc_bot <> 1 AND
            rc.rc_source = "mw.edit" AND
            NOT cr.comment_text LIKE 'Undid revision%' AND
            NOT cr.comment_text LIKE 'Restored revision%' AND
            NOT SUBSTRING(rc.rc_timestamp, 1, 8) = DATE_FORMAT(NOW(), '%Y%m%d')
    ) AS latest_non_bot_revisions 
    GROUP BY date
) AS avg_values;
SQL

Checking query status...
