Method identifier_quote_style

datafusion/sql/src/unparser/expr.rs:3094–3096

(&self, _identifier: &str)

        impl Dialect for MsSqlDialect {
            fn identifier_quote_style(&self, _identifier: &str) -> Option<char> {
                Some('[')
            }

            fn string_literal_to_sql(&self, s: &str) -> Option<ast::Expr> {
                if !s.is_ascii() {