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Use LEFT JOIN instead of UNION for hashtag pruning

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Norm 2024-10-25 12:25:18 -04:00
parent 40da4e88ea
commit 88a8086ad3
1 changed files with 10 additions and 7 deletions
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17
lib/mix/tasks/pleroma/database.ex
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@ -343,13 +343,16 @@ defmodule Mix.Tasks.Pleroma.Database do
%{:num_rows => del_hashtags} =
"""
DELETE FROM hashtags AS ht
WHERE NOT EXISTS (
SELECT 1 FROM hashtags_objects hto
WHERE ht.id = hto.hashtag_id
UNION
SELECT 1 FROM user_follows_hashtag ufht
WHERE ht.id = ufht.hashtag_id)
DELETE FROM hashtags
USING hashtags AS ht
LEFT JOIN hashtags_objects hto
ON ht.id = hto.hashtag_id
LEFT JOIN user_follows_hashtag ufht
ON ht.id = ufht.hashtag_id
WHERE
hashtags.id = ht.id
AND hto.hashtag_id is NULL
AND ufht.hashtag_id is NULL
"""
|> Repo.query!()