ai.rapids.cudf.GroupByScanAggregation Maven / Gradle / Ivy
/*
*
* Copyright (c) 2021-2022, NVIDIA CORPORATION.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
package ai.rapids.cudf;
/**
* An aggregation that can be used for a grouped scan.
*/
public final class GroupByScanAggregation {
private final Aggregation wrapped;
private GroupByScanAggregation(Aggregation wrapped) {
this.wrapped = wrapped;
}
long createNativeInstance() {
return wrapped.createNativeInstance();
}
long getDefaultOutput() {
return wrapped.getDefaultOutput();
}
Aggregation getWrapped() {
return wrapped;
}
/**
* Add a column to the Aggregation so it can be used on a specific column of data.
* @param columnIndex the index of the column to operate on.
*/
public GroupByScanAggregationOnColumn onColumn(int columnIndex) {
return new GroupByScanAggregationOnColumn(this, columnIndex);
}
@Override
public int hashCode() {
return wrapped.hashCode();
}
@Override
public boolean equals(Object other) {
if (other == this) {
return true;
} else if (other instanceof GroupByScanAggregation) {
GroupByScanAggregation o = (GroupByScanAggregation) other;
return wrapped.equals(o.wrapped);
}
return false;
}
/**
* Sum Aggregation
*/
public static GroupByScanAggregation sum() {
return new GroupByScanAggregation(Aggregation.sum());
}
/**
* Product Aggregation.
*/
public static GroupByScanAggregation product() {
return new GroupByScanAggregation(Aggregation.product());
}
/**
* Min Aggregation
*/
public static GroupByScanAggregation min() {
return new GroupByScanAggregation(Aggregation.min());
}
/**
* Max Aggregation
*/
public static GroupByScanAggregation max() {
return new GroupByScanAggregation(Aggregation.max());
}
/**
* Count number of elements.
* @param nullPolicy INCLUDE if nulls should be counted. EXCLUDE if only non-null values
* should be counted.
*/
public static GroupByScanAggregation count(NullPolicy nullPolicy) {
return new GroupByScanAggregation(Aggregation.count(nullPolicy));
}
/**
* Get the row's ranking.
*/
public static GroupByScanAggregation rank() {
return new GroupByScanAggregation(Aggregation.rank());
}
/**
* Get the row's dense ranking.
*/
public static GroupByScanAggregation denseRank() {
return new GroupByScanAggregation(Aggregation.denseRank());
}
/**
* Get the row's percent ranking.
*/
public static GroupByScanAggregation percentRank() {
return new GroupByScanAggregation(Aggregation.percentRank());
}
}