Re: Rethinking plpgsql's assignment implementation

Hi

Now, I am testing subscribing on the jsonb feature, and I found one issue,
that is not supported by parser.

When the target is scalar, then all is ok. But we can have a plpgsql array
of jsonb values.

postgres=# do $$
declare j jsonb[];
begin
j[1] = '{"b":"Ahoj"}';
raise notice '%', j;
raise notice '%', (j[1])['b'];
end
$$;
NOTICE: {"{\"b\": \"Ahoj\"}"}
NOTICE: "Ahoj"
DO

Parenthesis work well in expressions, but are not supported on the left
side of assignment.

postgres=# do $$
declare j jsonb[];
begin
(j[1])['b'] = '"Ahoj"';
raise notice '%', j;
raise notice '%', j[1]['b'];
end
$$;
ERROR: syntax error at or near "("
LINE 4: (j[1])['b'] = '"Ahoj"';
^

Regards

Pavel