Method parse_optional_args

src/sql-parser/src/parser.rs:8657–8679

(
        &mut self,
        allow_order_by: bool,
    )

    }

    fn parse_optional_args(
        &mut self,
        allow_order_by: bool,
    ) -> Result<FunctionArgs<Raw>, ParserError> {
        if self.consume_token(&Token::Star) {
            self.expect_token(&Token::RParen)?;
            Ok(FunctionArgs::Star)
        } else if self.consume_token(&Token::RParen) {
            Ok(FunctionArgs::args(vec![]))
        } else {
            let args = self.parse_comma_separated(Parser::parse_expr)?;
            // ORDER BY can only appear after at least one argument, and not after a
            // star. We can ignore checking for it in the other branches. See:
            // https://www.postgresql.org/docs/current/sql-expressions.html#SYNTAX-AGGREGATES
            let order_by = if allow_order_by && self.parse_keywords(&[ORDER, BY]) {
                self.parse_comma_separated(Parser::parse_order_by_expr)?
            } else {
                vec![]
            };
            self.expect_token(&Token::RParen)?;
            Ok(FunctionArgs::Args { args, order_by })
        }
    }

    /// Parse `AS OF`, if present.
    fn parse_optional_as_of(&mut self) -> Result<Option<AsOf<Raw>>, ParserError> {