code: public static Predicate is(final String sql) {
          return new Predicate() {
              public String toSql() {
                  return sql;
              }
              public void init(AbstractSqlCreator creator) {
              }
          };
      }
docs: Returns a predicate that takes no parameters. The given SQL expression is
  used directly.
  
  @param sql
  SQL text of the expression