Consider the following simplified rule:
CREATE OR REPLACE RULE r AS ON UPDATE TO t DO INSTEAD ( SELECT modify_something(new.id) ) RETURNING new.id;
This fails with the error: ERROR: syntax error at or near “RETURNING”
What I am trying to achieve is to be able to run an update statement on table t with a returning clause. I know that I can achieve this if the statement run in the rule was an INSERT or an UPDATE (by adding a RETURNING clause), but I do not know how to achieve this when it is a SELECT statement.
If I remove the RETURNING part of the query above, then I get the following message:
cannot perform UPDATE RETURNING on relation “t”
query: UPDATE t SET c = true WHERE id IN (1000460) RETURNING id
hint: You need an unconditional ON UPDATE DO INSTEAD rule with a RETURNING clause.
It was this error message that lead me to attempt the syntax in the beginning of this post.
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