/**
* Sorts Pojo or {@link org.apache.flink.api.java.tuple.Tuple} elements within a group in
* the second input on the specified field in the specified {@link Order}.<br>
* Groups can be sorted by multiple fields by chaining {@link #sortSecondGroup(String,
* Order)} calls.
*
* @param fieldExpression The expression to the field on which the group is to be sorted.
* @param order The Order in which the specified Tuple field is sorted.
* @return A SortedGrouping with specified order of group element.
* @see Order
*/
public CoGroupOperatorWithoutFunction sortSecondGroup(String fieldExpression, Order order) {
ExpressionKeys<I2> ek = new ExpressionKeys<>(fieldExpression, input2.getType());
int[] groupOrderKeys = ek.computeLogicalKeyPositions();
for (int key : groupOrderKeys) {
this.groupSortKeyOrderSecond.add(new ImmutablePair<>(key, order));
}
return this;
}
/**
* Sorts {@link org.apache.flink.api.java.tuple.Tuple} elements within a group in the first
* input on the specified field in the specified {@link Order}.<br>
* <b>Note: Only groups of Tuple elements and Pojos can be sorted.</b><br>
* Groups can be sorted by multiple fields by chaining {@link #sortFirstGroup(int, Order)}
* calls.
*
* @param field The Tuple field on which the group is sorted.
* @param order The Order in which the specified Tuple field is sorted.
* @return A SortedGrouping with specified order of group element.
* @see org.apache.flink.api.java.tuple.Tuple
* @see Order
*/
public CoGroupOperatorWithoutFunction sortFirstGroup(int field, Order order) {
ExpressionKeys<I1> ek = new ExpressionKeys<>(field, input1.getType());
int[] groupOrderKeys = ek.computeLogicalKeyPositions();
for (int key : groupOrderKeys) {
this.groupSortKeyOrderFirst.add(new ImmutablePair<>(key, order));
}
return this;
}