Method filter

src/java/simpledb/execution/Predicate.java:109–113

Compares the field number of t specified in the constructor to the operand field specified in the constructor using the operator specific in the constructor. The comparison can be made through Field's compare method. @param t The tuple to compare against @return true if the comparison is

(Tuple t)

     * @return true if the comparison is true, false otherwise.
     */
    public boolean filter(Tuple t) {
        // some code goes here
        Field field = t.getField(this.field);
        return field.compare(this.op,this.operand);
    }

    /**
     * Returns something useful, like "f = field_id op = op_string operand =