io.trino.operator.aggregation.ArbitraryAggregationFunction Maven / Gradle / Ivy
/*
* 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 io.trino.operator.aggregation;
import io.trino.spi.block.BlockBuilder;
import io.trino.spi.block.ValueBlock;
import io.trino.spi.function.AggregationFunction;
import io.trino.spi.function.AggregationState;
import io.trino.spi.function.BlockIndex;
import io.trino.spi.function.BlockPosition;
import io.trino.spi.function.CombineFunction;
import io.trino.spi.function.Description;
import io.trino.spi.function.InOut;
import io.trino.spi.function.InputFunction;
import io.trino.spi.function.OutputFunction;
import io.trino.spi.function.SqlType;
import io.trino.spi.function.TypeParameter;
@AggregationFunction(value = "any_value", alias = "arbitrary")
@Description("Return an arbitrary non-null input value")
public final class ArbitraryAggregationFunction
{
private ArbitraryAggregationFunction() {}
@InputFunction
@TypeParameter("T")
public static void input(
@AggregationState("T") InOut state,
@BlockPosition @SqlType("T") ValueBlock block,
@BlockIndex int position)
throws Throwable
{
if (state.isNull()) {
state.set(block, position);
}
}
@CombineFunction
public static void combine(
@AggregationState("T") InOut state,
@AggregationState("T") InOut otherState)
throws Throwable
{
if (state.isNull()) {
state.set(otherState);
}
}
@OutputFunction("T")
public static void output(@AggregationState("T") InOut state, BlockBuilder out)
{
state.get(out);
}
}