Schema qualified function name fails to parse on Postgres

[serpent7776]

In Postgres function created by CREATE FUNCTION can be schema qualified. sqlgg doesn't support that and fails to parse such statement. CREATE PROCEDURE can also be schema qualified.

https://www.postgresql.org/docs/current/sql-createfunction.html

CREATE OR REPLACE FUNCTION ns.add(i INT, j INT) RETURNS INT AS $$
BEGIN
    RETURN i + j;
END;
$$ LANGUAGE plpgsql;

SELECT ns.add(2);

The error I get:

==> CREATE OR REPLACE FUNCTION ns.add(i INT, j INT) RETURNS INT AS $$
BEGIN
    RETURN i + j;
END;
$$ LANGUAGE plpgsql
Position 1:30 Tokens: .add(i INT, j INT) RETURNS INT AS
Error: Sqlgg.Sql_parser.MenhirBasics.Error
==> SELECT ns.add(2)
Position 1:13 Tokens: add(2)
Error: Sqlgg.Sql_parser.MenhirBasics.Error
Errors encountered, no code generated