presto-main/src/main/java/io/prestosql/sql/planner/Partitioning.java/ArgumentBinding/equals
class ArgumentBinding:        @Override
        public boolean equals(Object o)
        {
            if (this == o) {
                return true;
            }
            if (o == null || getClass() != o.getClass()) {
                return false;
            }
            ArgumentBinding that = (ArgumentBinding) o;
            return Objects.equals(expression, that.expression) &&
                    Objects.equals(constant, that.constant);
        }