Bruce Momjian <bruce@momjian.us> writes: > Oh, I think you are right. I have reverted the patch. Attached is > proposed documentation for '='.
Meh. Variable initialization is only one of multiple cases (assignment, GET DIAGNOSTICS; maybe others, I've not examined the grammar). Also, if we do it like this, we're implying that both := and = are equally preferred, which might not be the impression we want to leave.
GET DIAGNOSTICS is defined by standard - and there "=" should be allowed only - although we allow ":=" too. It is a embedded SQL statement - although it is implemented as plpgsql statement.
Same situation is with UPDATE statement - we don't allow ":=" there.
I'd be a bit inclined to just stick a NOTE somewhere saying that "=" can be used in place of ":=" for assignment.
ok
If we accept it and we close this topic, then following comment should be removed
assign_operator : '=' /* not documented because it might be removed someday */ | COLON_EQUALS ;