Did you try rewriting the query to avoid using an IN expression?
UPDATE foo SET processing = 't'
FROM (
SELECT id FROM foo WHERE processing = 'f' ORDER BY id ASC LIMIT 5000 FOR
UPDATE
) src
WHERE foo.id = src.id;
The workaround I mentioned above said that a CTE was needed but I'm thinking
that a simply FROM would be just as effective. Otherwise:
UPDATE foo SET processing = 't'
FROM (
WITH ids_to_update AS (
SELECT id FROM foo WHERE processing = 'f' ORDER BY id ASC LIMIT 5000 FOR
UPDATE
)
SELECT id FROM ids_to_update
) src
WHERE foo.id = src.id;
David J.
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