/**
* Applies an aggregation that gives the maximum value of every window of the data stream at the
* given position.
*
* @param positionToMax The position to maximize
* @return The transformed DataStream.
*/
public SingleOutputStreamOperator<T, ?> max(int positionToMax) {
return aggregate(
new ComparableAggregator<>(
positionToMax,
input.getType(),
AggregationFunction.AggregationType.MAX,
input.getExecutionConfig()));
}
/**
* Applies an aggregation that that gives the maximum element of the pojo data stream by the given
* field expression for every window. A field expression is either the name of a public field or a
* getter method with parentheses of the {@link DataStream}S underlying type. A dot can be used to
* drill down into objects, as in {@code "field1.getInnerField2()" }.
*
* @param field The field expression based on which the aggregation will be applied.
* @param first If True then in case of field equality the first object will be returned
* @return The transformed DataStream.
*/
public SingleOutputStreamOperator<T, ?> maxBy(String field, boolean first) {
return aggregate(
new ComparableAggregator<>(
field,
input.getType(),
AggregationFunction.AggregationType.MAXBY,
first,
input.getExecutionConfig()));
}
/**
* Applies an aggregation that that gives the maximum value of the pojo data stream at the given
* field expression for every window. A field expression is either the name of a public field or a
* getter method with parentheses of the {@link DataStream DataStreams} underlying type. A dot can
* be used to drill down into objects, as in {@code "field1.getInnerField2()" }.
*
* @param field The field expression based on which the aggregation will be applied.
* @return The transformed DataStream.
*/
public SingleOutputStreamOperator<T, ?> max(String field) {
return aggregate(
new ComparableAggregator<>(
field,
input.getType(),
AggregationFunction.AggregationType.MAX,
false,
input.getExecutionConfig()));
}
/**
* Applies an aggregation that gives the minimum element of every window of the data stream by the
* given position. If more elements have the same minimum value the operator returns either the
* first or last one depending on the parameter setting.
*
* @param positionToMinBy The position to minimize
* @param first If true, then the operator return the first element with the minimum value,
* otherwise returns the last
* @return The transformed DataStream.
*/
public SingleOutputStreamOperator<T, ?> minBy(int positionToMinBy, boolean first) {
return aggregate(
new ComparableAggregator<>(
positionToMinBy,
input.getType(),
AggregationFunction.AggregationType.MINBY,
first,
input.getExecutionConfig()));
}
/**
* Applies an aggregation that sums every window of the pojo data stream at the given field for
* every window.
*
* <p>A field expression is either the name of a public field or a getter method with parentheses
* of the stream's underlying type. A dot can be used to drill down into objects, as in {@code
* "field1.getInnerField2()" }.
*
* @param field The field to sum
* @return The transformed DataStream.
*/
public SingleOutputStreamOperator<T, ?> sum(String field) {
return aggregate(new SumAggregator<>(field, input.getType(), input.getExecutionConfig()));
}
/**
* Applies an aggregation that sums every window of the data stream at the given position.
*
* @param positionToSum The position in the tuple/array to sum
* @return The transformed DataStream.
*/
public SingleOutputStreamOperator<T, ?> sum(int positionToSum) {
return aggregate(
new SumAggregator<>(positionToSum, input.getType(), input.getExecutionConfig()));
}
