lemmy/migrations/2020-01-29-030825_create_us.../up.sql

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CREATE VIEW user_mention_mview AS
with all_comment AS (
SELECT
ca.*
FROM
comment_aggregates_mview ca
)
SELECT
ac.id,
um.id AS user_mention_id,
ac.creator_id,
ac.post_id,
ac.parent_id,
ac.content,
ac.removed,
um.read,
ac.published,
ac.updated,
ac.deleted,
ac.community_id,
ac.banned,
ac.banned_from_community,
ac.creator_name,
ac.creator_avatar,
ac.score,
ac.upvotes,
ac.downvotes,
u.id AS user_id,
coalesce(cl.score, 0) AS my_vote,
(
SELECT
cs.id::bool
FROM
comment_saved cs
WHERE
u.id = cs.user_id
AND cs.comment_id = ac.id) AS saved,
um.recipient_id
FROM
user_ u
CROSS JOIN all_comment ac
LEFT JOIN comment_like cl ON u.id = cl.user_id
AND ac.id = cl.comment_id
LEFT JOIN user_mention um ON um.comment_id = ac.id
UNION ALL
SELECT
ac.id,
um.id AS user_mention_id,
ac.creator_id,
ac.post_id,
ac.parent_id,
ac.content,
ac.removed,
um.read,
ac.published,
ac.updated,
ac.deleted,
ac.community_id,
ac.banned,
ac.banned_from_community,
ac.creator_name,
ac.creator_avatar,
ac.score,
ac.upvotes,
ac.downvotes,
NULL AS user_id,
NULL AS my_vote,
NULL AS saved,
um.recipient_id
FROM
all_comment ac
LEFT JOIN user_mention um ON um.comment_id = ac.id;