- Change fetch_catalog and fetch_top_threads functions
- neither was correct
- fetch_top_threads doesn't need to be a loop, it will be up to the
application whether or not to load more results. This simplifies
the function, which was sometimes returning more than one row for
each thread_id anyway
- fetch_catalog is now fairly performant, and fetches all relevant
information
This commit is contained in:
parent
7b8b1b2255
commit
c297bae697
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@ -28,7 +28,7 @@ LIMIT
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100;
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SELECT
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SELECT
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thread_data.thread_id,
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thread_data.bump_time,
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thread_data.first_post_subject,
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@ -313,6 +313,16 @@ group by thread_id
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order by bump_time desc;
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select max(creation_time) as bump_time, count(*), thread_id, min(creation_time) as where_to_leave_off
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from
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(
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select thread_id, creation_time, body from posts
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where creation_time < NOW() - interval '365 day'
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order by creation_time desc limit 10000
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) as t
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group by thread_id
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order by bump_time desc;
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explain analyze SELECT
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@ -330,8 +340,8 @@ LIMIT 100
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-- Create temp table if not exists
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drop table if exists temp_results;
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CREATE TEMP TABLE IF NOT EXISTS temp_results (bump_time TIMESTAMPTZ, post_count INT, thread_id INT, last_fetched_time TIMESTAMP);
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DROP TABLE IF EXISTS temp_results;
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/*
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* This function scans backwards from p_start_time until we get the desired number of threads.
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@ -351,7 +361,8 @@ DECLARE
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max_iterations INT := 10; -- Maximum iterations to avoid endless loop in case of errors
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result_count INT := 0;
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last_min_time TIMESTAMP;
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BEGIN
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BEGIN
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CREATE TEMP TABLE IF NOT EXISTS temp_results (bump_time TIMESTAMPTZ, post_count INT, thread_id INT, last_fetched_time TIMESTAMP);
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TRUNCATE temp_results; -- clear the table
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FOR i IN 1..max_iterations LOOP
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@ -368,9 +379,7 @@ BEGIN
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GROUP BY t.thread_id;
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-- Check if we have enough threads
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--SELECT temp_results.thread_id INTO result_count FROM temp_results;
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SELECT COUNT(DISTINCT temp_results.thread_id) INTO result_count FROM temp_results; -- specify the table name here to avoid ambiguity
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SELECT COUNT(DISTINCT temp_results.thread_id) INTO result_count FROM temp_results;
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IF result_count >= p_desired_threads THEN
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EXIT;
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@ -387,13 +396,14 @@ BEGIN
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-- Return the results
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RETURN QUERY SELECT temp_results.bump_time, temp_results.post_count, temp_results.thread_id FROM temp_results ORDER BY temp_results.bump_time DESC;
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DROP TABLE IF EXISTS temp_results;
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END;
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$$;
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select * FROM fetch_top_threads(NOW(), 300) offset 0;
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select * FROM fetch_top_threads(NOW(), 100);
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explain analyze WITH TopThreads AS (
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WITH TopThreads AS (
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SELECT * FROM fetch_top_threads(NOW() - interval '365d', 100)
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)
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SELECT
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@ -409,3 +419,175 @@ JOIN
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posts p ON tt.thread_id = p.thread_id
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ORDER BY
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p.creation_time asc;
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SELECT *
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FROM
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fetch_top_threads(NOW() - interval '365d', 100) top
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JOIN
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posts ON posts.thread_id = top.thread_id
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ORDER BY posts.creation_time ASC;
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SELECT
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post_id,
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board_post_id,
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posts.thread_id,
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bump_time,
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creation_time,
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body
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FROM
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fetch_top_threads(NOW() - interval '365d', 100) top
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JOIN
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posts ON posts.thread_id = top.thread_id
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ORDER BY posts.creation_time ASC;
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VACUUM ANALYZE posts;
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SELECT posts.post_id, posts.thread_id, posts.body
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FROM
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fetch_top_threads(NOW(), 100) top
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JOIN
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posts ON posts.thread_id = top.thread_id;
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WITH
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top AS (
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SELECT * FROM fetch_top_threads(NOW(), 100) top
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),
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joined AS (
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SELECT posts.post_id, posts.thread_id, posts.body
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FROM top JOIN posts ON posts.thread_id = top.thread_id
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ORDER BY posts.creation_time DESC
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),
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grouped AS (
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SELECT min(joined.post_id) op_post_id, joined.thread_id FROM joined
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GROUP BY joined.thread_id
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) SELECT * FROM grouped JOIN joined ON op_post_id = joined.post_id;
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WITH
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top AS (
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SELECT * FROM fetch_top_threads(NOW(), 100) OFFSET 0
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),
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joined AS (
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SELECT posts.post_id, posts.thread_id, posts.body, posts.creation_time
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FROM top JOIN posts ON posts.thread_id = top.thread_id
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ORDER BY posts.creation_time DESC
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),
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grouped AS (
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SELECT min(joined.creation_time) op_creation_time, joined.thread_id, count(*) AS post_count FROM joined
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GROUP BY joined.thread_id
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) SELECT joined.*, grouped.post_count
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FROM grouped JOIN joined ON op_creation_time = joined.creation_time AND grouped.thread_id = joined.thread_id;
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WITH
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top AS (
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SELECT * FROM fetch_top_threads(NOW(), 200) OFFSET 0
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),
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joined AS (
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SELECT
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posts.post_id,
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posts.thread_id,
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posts.body,
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posts.creation_time,
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ROW_NUMBER() OVER(PARTITION BY posts.thread_id ORDER BY posts.creation_time, posts.post_id) as rn
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FROM top
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JOIN posts ON posts.thread_id = top.thread_id
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),
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grouped AS (
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SELECT joined.post_id, joined.thread_id
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FROM joined
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WHERE joined.rn = 1
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)
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SELECT joined.*
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FROM grouped
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JOIN joined ON grouped.post_id = joined.post_id;
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SELECT
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sub.post_id,
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sub.thread_id,
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sub.body,
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sub.creation_time
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FROM
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(
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SELECT
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posts.post_id,
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posts.thread_id,
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posts.body,
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posts.creation_time,
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ROW_NUMBER() OVER(PARTITION BY posts.thread_id ORDER BY posts.creation_time, posts.post_id) as rn
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FROM fetch_top_threads(NOW(), 200) AS top
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JOIN posts ON posts.thread_id = top.thread_id
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) AS sub
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WHERE
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sub.rn = 1;
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SELECT
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sub.post_id,
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sub.thread_id,
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sub.body,
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sub.creation_time
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FROM
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(
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SELECT
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posts.post_id,
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posts.thread_id,
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posts.body,
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posts.creation_time,
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ROW_NUMBER() OVER(PARTITION BY posts.thread_id ORDER BY posts.creation_time, posts.post_id) as rn
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FROM
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(SELECT * FROM fetch_top_threads(NOW(), 200) OFFSET 0) AS top
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JOIN posts ON posts.thread_id = top.thread_id
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) AS sub
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WHERE
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sub.rn = 1;
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SELECT count(*) FROM fetch_catalog(NOW(), 400, 0);
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SELECT * FROM fetch_top_threads(NOW(), 200);
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SELECT count(*) FROM
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(
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SELECT top.thread_id, count(*) as post_count FROM fetch_top_threads(NOW(), 200) top JOIN posts ON posts.thread_id = top.thread_id
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GROUP BY top.thread_id
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) t;
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-- how do I
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CREATE OR REPLACE FUNCTION fetch_catalog(max_time timestamptz, wanted_result_count integer, offset_count integer)
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RETURNS TABLE (
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op_post_id bigint,
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thread_id bigint,
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post_count bigint,
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body text,
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creation_time timestamptz
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)
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LANGUAGE SQL
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AS $$
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WITH
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top AS (
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SELECT * FROM fetch_top_threads(max_time, wanted_result_count) OFFSET offset_count
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),
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joined AS (
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SELECT posts.post_id, posts.thread_id, posts.body, posts.creation_time
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FROM top JOIN posts ON posts.thread_id = top.thread_id
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ORDER BY posts.creation_time DESC
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),
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grouped AS (
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SELECT min(joined.post_id) op_post_id, joined.thread_id, count(*) AS post_count FROM joined
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GROUP BY joined.thread_id
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) SELECT grouped.*, joined.body, joined.creation_time FROM grouped JOIN joined ON op_post_id = joined.post_id;
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$$;
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@ -0,0 +1,216 @@
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CREATE OR REPLACE FUNCTION fetch_top_threads(
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p_start_time TIMESTAMPTZ,
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lookback INT DEFAULT 10000
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)
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RETURNS TABLE(bump_time TIMESTAMPTZ, post_count BIGINT, thread_id BIGINT, where_to_leave_off TIMESTAMPTZ)
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LANGUAGE sql
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AS $$
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SELECT
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max(creation_time) as bump_time,
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count(*),
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thread_id,
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min(creation_time) as where_to_leave_off
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FROM
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(
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SELECT thread_id, creation_time
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FROM posts
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WHERE creation_time < p_start_time
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ORDER BY creation_time DESC
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LIMIT LEAST(lookback, 250000) -- capping the lookback to 250k
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) as t
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GROUP BY thread_id
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ORDER BY bump_time DESC;
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$$;
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SELECT * FROM fetch_top_threads(NOW() - INTERVAL '10d');
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SELECT * FROM fetch_top_threads(NOW() - INTERVAL '10d') top JOIN posts ON top.thread_id = posts.thread_id;
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SELECT
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ordered_posts.thread_id,
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count(*),
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array_agg(ordered_posts.body)
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FROM (
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SELECT top.thread_id, posts.body
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FROM fetch_top_threads(NOW() - INTERVAL '10d', 2000) top
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JOIN posts ON top.thread_id = posts.thread_id
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ORDER BY posts.board_post_id ASC
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) AS ordered_posts
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GROUP BY ordered_posts.thread_id;
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WITH
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top AS
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(
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SELECT * FROM fetch_top_threads(NOW()) top
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),
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tall_posts AS
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(
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SELECT top.post_count as estimated_post_count, posts.*
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FROM top
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JOIN posts ON top.thread_id = posts.thread_id
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),
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op_posts AS
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(
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SELECT DISTINCT ON (t.thread_id)
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*
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FROM tall_posts t
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ORDER BY t.thread_id, t.board_post_id
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)
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SELECT * FROM op_posts;
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WITH
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top AS
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(
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SELECT * FROM fetch_top_threads(NOW()) top
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),
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tall_posts AS
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(
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SELECT top.post_count as estimated_post_count, posts.*
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FROM top
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JOIN posts ON top.thread_id = posts.thread_id
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),
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op_posts AS
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(
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SELECT DISTINCT ON (t.thread_id)
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*
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FROM tall_posts t
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ORDER BY t.thread_id, t.board_post_id
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),
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post_counts AS
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(
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SELECT thread_id, count(*) as post_count FROM
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tall_posts
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GROUP BY thread_id
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)
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SELECT post_counts.post_count, op_posts.* FROM op_posts JOIN post_counts ON op_posts.thread_id = post_counts.thread_id;
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-- 71ms!
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WITH
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top AS
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(
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SELECT * FROM fetch_top_threads(NOW() - INTERVAL '1y', 1000) top
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),
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tall_posts AS
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(
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SELECT
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top.post_count as estimated_post_count,
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top.bump_time,
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posts.post_id,
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posts.board_post_id,
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posts.creation_time,
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posts.body,
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posts.thread_id
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FROM top
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JOIN posts ON top.thread_id = posts.thread_id
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),
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op_posts AS
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(
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SELECT DISTINCT ON (t.thread_id)
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*
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FROM tall_posts t
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ORDER BY t.thread_id, t.board_post_id
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),
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post_counts AS
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(
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SELECT thread_id, count(*) as post_count FROM
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tall_posts
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GROUP BY thread_id
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)
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SELECT
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post_counts.post_count,
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op_posts.*,
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threads.board_thread_id,
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boards.pathpart,
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sites."name"
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FROM op_posts
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JOIN post_counts ON op_posts.thread_id = post_counts.thread_id
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JOIN threads ON op_posts.thread_id = threads.thread_id
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JOIN boards ON threads.board_id = boards.board_id
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JOIN sites ON sites.site_id = boards.site_id;
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CREATE OR REPLACE FUNCTION fetch_catalog(max_time timestamptz, max_row_read int DEFAULT 10000)
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RETURNS TABLE (
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post_count bigint,
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estimated_post_count bigint,
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post_id bigint,
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board_post_id bigint,
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creation_time timestamptz,
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body text,
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thread_id bigint,
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board_thread_id bigint,
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pathpart text,
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name text
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) AS $$
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WITH
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top AS
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(
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SELECT * FROM fetch_top_threads(max_time, max_row_read) AS top
|
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),
|
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tall_posts AS
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(
|
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SELECT
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top.post_count as estimated_post_count,
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posts.post_id,
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posts.board_post_id,
|
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posts.creation_time,
|
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posts.body,
|
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posts.thread_id
|
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FROM top
|
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JOIN posts ON top.thread_id = posts.thread_id
|
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WHERE creation_time < max_time
|
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),
|
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op_posts AS
|
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(
|
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SELECT DISTINCT ON (t.thread_id)
|
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*
|
||||
FROM tall_posts t
|
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ORDER BY t.thread_id, t.board_post_id
|
||||
),
|
||||
post_counts AS
|
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(
|
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SELECT thread_id, count(*) as post_count FROM
|
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tall_posts
|
||||
GROUP BY thread_id
|
||||
)
|
||||
SELECT
|
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post_counts.post_count,
|
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op_posts.*,
|
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threads.board_thread_id,
|
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boards.pathpart,
|
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sites."name"
|
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FROM op_posts
|
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JOIN post_counts ON op_posts.thread_id = post_counts.thread_id
|
||||
JOIN threads ON op_posts.thread_id = threads.thread_id
|
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JOIN boards ON threads.board_id = boards.board_id
|
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JOIN sites ON sites.site_id = boards.site_id;
|
||||
$$ LANGUAGE sql;
|
||||
|
||||
SELECT * FROM fetch_catalog(NOW() - INTERVAL '1y', 1001);
|
||||
|
||||
|
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-- CREATE INDEX idx_posts_thread_board ON posts (thread_id, board_post_id);
|
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ANALYZE posts;
|
||||
|
||||
|
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SELECT DISTINCT ON (top.thread_id)
|
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top.thread_id,
|
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posts.post_id,
|
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posts.body,
|
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top.post_count,
|
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top.where_to_leave_off
|
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FROM fetch_top_threads(NOW() - INTERVAL '10d') top
|
||||
JOIN posts ON top.thread_id = posts.thread_id
|
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ORDER BY top.thread_id, posts.board_post_id;
|
||||
|
||||
|
||||
SELECT * FROM threads WHERE thread_id = 3110;
|
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SELECT * FROM posts WHERE thread_id = 3110 ORDER BY board_post_id ASC;
|
||||
SELECT * FROM boards;
|
||||
|
||||
SELECT * FROM threads WHERE thread_id = 11314;
|
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ANALYZE posts;
|
||||
|
|
@ -16,6 +16,9 @@ DROP TABLE IF EXISTS threads CASCADE;
|
|||
DROP TABLE IF EXISTS posts CASCADE;
|
||||
DROP TABLE IF EXISTS attachments CASCADE;
|
||||
DROP FUNCTION IF EXISTS update_post_body_search_index;
|
||||
DROP FUNCTION IF EXISTS fetch_top_threads;
|
||||
DROP FUNCTION IF EXISTS fetch_catalog;
|
||||
|
||||
|
||||
-- It won't let us drop roles otherwise and the IFs are to keep this script idempotent.
|
||||
DO
|
||||
|
|
@ -73,6 +76,7 @@ CREATE INDEX posts_body_search_idx ON posts USING GIN (body_search_index);
|
|||
CREATE INDEX posts_thread_id_idx ON posts (thread_id);
|
||||
CREATE INDEX posts_board_post_id_idx ON posts (board_post_id);
|
||||
CREATE INDEX posts_thread_id_creation_time_idx ON posts (creation_time, thread_id);
|
||||
--CREATE INDEX posts_thread_id_board_post_id_idx ON posts (thread_id, board_post_id);
|
||||
|
||||
CREATE OR REPLACE FUNCTION update_post_body_search_index() RETURNS trigger AS $$
|
||||
BEGIN
|
||||
|
|
@ -167,6 +171,89 @@ $$ LANGUAGE sql;
|
|||
-- 1:21 for full db (nothing inserted)
|
||||
|
||||
|
||||
CREATE OR REPLACE FUNCTION fetch_top_threads(
|
||||
p_start_time TIMESTAMPTZ,
|
||||
lookback INT DEFAULT 10000
|
||||
)
|
||||
RETURNS TABLE(bump_time TIMESTAMPTZ, post_count BIGINT, thread_id BIGINT, where_to_leave_off TIMESTAMPTZ)
|
||||
LANGUAGE sql
|
||||
AS $$
|
||||
SELECT
|
||||
max(creation_time) as bump_time,
|
||||
count(*),
|
||||
thread_id,
|
||||
min(creation_time) as where_to_leave_off
|
||||
FROM
|
||||
(
|
||||
SELECT thread_id, creation_time
|
||||
FROM posts
|
||||
WHERE creation_time < p_start_time
|
||||
ORDER BY creation_time DESC
|
||||
LIMIT LEAST(lookback, 250000) -- capping the lookback to 250k
|
||||
) as t
|
||||
GROUP BY thread_id
|
||||
ORDER BY bump_time DESC;
|
||||
$$;
|
||||
|
||||
|
||||
CREATE OR REPLACE FUNCTION fetch_catalog(max_time timestamptz, max_row_read int DEFAULT 10000)
|
||||
RETURNS TABLE (
|
||||
post_count bigint,
|
||||
estimated_post_count bigint,
|
||||
post_id bigint,
|
||||
board_post_id bigint,
|
||||
creation_time timestamptz,
|
||||
body text,
|
||||
thread_id bigint,
|
||||
board_thread_id bigint,
|
||||
pathpart text,
|
||||
name text
|
||||
) AS $$
|
||||
WITH
|
||||
top AS
|
||||
(
|
||||
SELECT * FROM fetch_top_threads(max_time, max_row_read) AS top
|
||||
),
|
||||
tall_posts AS
|
||||
(
|
||||
SELECT
|
||||
top.post_count as estimated_post_count,
|
||||
posts.post_id,
|
||||
posts.board_post_id,
|
||||
posts.creation_time,
|
||||
posts.body,
|
||||
posts.thread_id
|
||||
FROM top
|
||||
JOIN posts ON top.thread_id = posts.thread_id
|
||||
WHERE creation_time < max_time
|
||||
),
|
||||
op_posts AS
|
||||
(
|
||||
SELECT DISTINCT ON (t.thread_id)
|
||||
*
|
||||
FROM tall_posts t
|
||||
ORDER BY t.thread_id, t.board_post_id
|
||||
),
|
||||
post_counts AS
|
||||
(
|
||||
SELECT thread_id, count(*) as post_count FROM
|
||||
tall_posts
|
||||
GROUP BY thread_id
|
||||
)
|
||||
SELECT
|
||||
post_counts.post_count,
|
||||
op_posts.*,
|
||||
threads.board_thread_id,
|
||||
boards.pathpart,
|
||||
sites."name"
|
||||
FROM op_posts
|
||||
JOIN post_counts ON op_posts.thread_id = post_counts.thread_id
|
||||
JOIN threads ON op_posts.thread_id = threads.thread_id
|
||||
JOIN boards ON threads.board_id = boards.board_id
|
||||
JOIN sites ON sites.site_id = boards.site_id;
|
||||
$$ LANGUAGE sql;
|
||||
|
||||
|
||||
/*
|
||||
* Permissions
|
||||
*/
|
||||
|
|
@ -192,6 +279,8 @@ GRANT ALL ON posts TO chan_archiver;
|
|||
GRANT ALL ON attachments TO chan_archiver;
|
||||
GRANT EXECUTE ON FUNCTION update_post_body_search_index TO chan_archiver;
|
||||
GRANT EXECUTE ON FUNCTION insert_posts_and_return_ids TO chan_archiver;
|
||||
GRANT EXECUTE ON FUNCTION fetch_top_threads TO chan_archiver;
|
||||
GRANT EXECUTE ON FUNCTION fetch_catalog TO chan_archiver;
|
||||
GRANT usage, select ON SEQUENCE sites_site_id_seq TO chan_archiver;
|
||||
GRANT usage, select ON SEQUENCE boards_board_id_seq TO chan_archiver;
|
||||
GRANT usage, select ON SEQUENCE threads_thread_id_seq TO chan_archiver;
|
||||
|
|
|
|||
Loading…
Reference in New Issue