try to fix combine_transition_tables parse error

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dullbananas 2023-12-29 13:44:34 -07:00 committed by GitHub
parent 91d8179276
commit 75d00a4626
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@ -36,42 +36,62 @@ BEGIN
END
$$;
-- Selects both old and new rows in a trigger and allows using `sum(count_diff)` to get the number to add to a count
CREATE FUNCTION r.combine_transition_tables (tg_op text)
-- Create functions that select both old and new rows in a trigger. Column 1 is `-1` if old and `1` if new,
-- which can be used with `sum` to get the number to add to a count. Column 2 is the original row as a composite
-- value. A separate function is called in each `IF` statement to prevent an error from referencing transition
-- tables that don't exist. All of this could be one function, but that would require using `RETURN QUERY EXECUTE`
-- instead of calls to separate functions because of PostgreSQL's limited polymorphism. Parsing and planning dynamic
-- queries at runtime is worse for performance.
CREATE PROCEDURE r.combine_transition_tables_function (table_name text)
LANGUAGE plpgsql
AS $a$
BEGIN
EXECUTE replace($b$
CREATE FUNCTION r.get_old_thing_rows ()
RETURNS SETOF record
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP = 'UPDATE') THEN
RETURN QUERY
SELECT
-1 AS count_diff,
old_table AS affected_row
FROM
old_table
UNION ALL
SELECT
1 AS count_diff,
new_table AS affected_row
FROM
new_table;
ELSIF (TG_OP = 'INSERT') THEN
RETURN QUERY
SELECT
1 AS count_diff,
*
FROM
new_table;
ELSE
RETURN QUERY
SELECT
-1 AS count_diff,
*
FROM
old_table;
BEGIN
RETURN QUERY SELECT -1, old_table FROM old_table;
RETURN;
END
$$;
CREATE FUNCTION r.get_new_thing_rows ()
RETURNS SETOF record
LANGUAGE plpgsql
AS $$
BEGIN
RETURN QUERY SELECT 1, new_table FROM new_table;
RETURN;
END
$$;
CREATE FUNCTION r.combine_thing_transition_tables (tg_op text)
RETURNS SETOF record
LANGUAGE plpgsql
AS $$
BEGIN
IF (TG_OP IN ('UPDATE', 'DELETE')) THEN
RETURN QUERY SELECT * FROM r.get_old_thing_rows () AS (count_diff bigint, thing thing);
END IF;
IF (TG_OP IN ('UPDATE', 'INSERT')) THEN
RETURN QUERY SELECT * FROM r.get_new_thing_rows () AS (count_diff bigint, thing thing);
END IF;
RETURN;
END
$$;
$b$, 'thing', table_name);
END
$$;
$a$;
CALL r.combine_transition_tables_function('comment');
CALL r.combine_transition_tables_function('community');
CALL r.combine_transition_tables_function('community_follower');
CALL r.combine_transition_tables_function('person');
CALL r.combine_transition_tables_function('post');
-- Creates triggers for all operation types, which can't be 1 trigger when transition tables are used
CREATE PROCEDURE r.create_triggers (table_name text, function_name text)
@ -148,7 +168,7 @@ BEGIN
sum(count_diff) FILTER (WHERE (thing_like).score = 1) AS upvotes,
sum(count_diff) FILTER (WHERE (thing_like).score != 1) AS downvotes
FROM
r.combine_transition_tables (TG_OP)
r.combine_thing_transition_tables (TG_OP)
AS (count_diff bigint,
thing_like thing_like)
GROUP BY
@ -198,7 +218,7 @@ BEGIN
(comment).local,
sum(count_diff) AS comments
FROM
r.combine_transition_tables (TG_OP)
r.combine_comment_transition_tables (TG_OP)
AS (count_diff bigint,
comment comment)
WHERE
@ -301,7 +321,7 @@ BEGIN
(post).local,
sum(count_diff) AS posts
FROM
r.combine_transition_tables (TG_OP)
r.combine_post_transition_tables (TG_OP)
AS (count_diff bigint,
post post)
WHERE
@ -357,7 +377,7 @@ BEGIN
SELECT
sum(count_diff) AS communities
FROM
r.combine_transition_tables (TG_OP)
r.combine_community_transition_tables (TG_OP)
AS (count_diff bigint, community community)
WHERE (community).local AND NOT ((community).deleted OR (community).removed)) AS diff;
RETURN NULL;
@ -379,7 +399,7 @@ BEGIN
SELECT
sum(count_diff) AS users
FROM
r.combine_transition_tables (TG_OP)
r.combine_person_transition_tables (TG_OP)
AS (count_diff bigint, person person)
WHERE (person).local) AS diff;
RETURN NULL;
@ -450,7 +470,7 @@ BEGIN
(community_follower).community_id,
sum(count_diff) AS subscribers
FROM
r.combine_transition_tables (TG_OP)
r.combine_community_follower_transition_tables (TG_OP)
AS (count_diff bigint, community_follower community_follower)
WHERE (
SELECT