43d5548f30
On PG 12, 13, the internal return instruction in the following function:
```
CREATE OR REPLACE FUNCTION add(int, int) RETURNS INTEGER AS
$$
BEGIN
return (select $1 + $2);
END; $$ language plpgsql;
```
Is stored as SELECT (select expr1 + expr2)
On PG 14 onward it's stored just as SELECT (expr1 + expr2)
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