Method function_to_sql_internal

datafusion/sql/src/unparser/expr.rs:634–658

(
        &self,
        func_name: &str,
        args: &[Expr],
    )

    }

    fn function_to_sql_internal(
        &self,
        func_name: &str,
        args: &[Expr],
    ) -> Result<ast::Expr> {
        let args = self.function_args_to_sql(args)?;
        Ok(ast::Expr::Function(Function {
            name: ObjectName::from(vec![Ident {
                value: func_name.to_string(),
                quote_style: None,
                span: Span::empty(),
            }]),
            args: ast::FunctionArguments::List(ast::FunctionArgumentList {
                duplicate_treatment: None,
                args,
                clauses: vec![],
            }),
            filter: None,
            null_treatment: None,
            over: None,
            within_group: vec![],
            parameters: ast::FunctionArguments::None,
            uses_odbc_syntax: false,
        }))
    }

    fn make_array_to_sql(&self, args: &[Expr]) -> Result<ast::Expr> {
        let args = args