io.prestosql.tests.CreateHll 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.prestosql.tests;
import io.airlift.slice.Slice;
import io.airlift.stats.cardinality.HyperLogLog;
import io.prestosql.spi.function.ScalarFunction;
import io.prestosql.spi.function.SqlType;
import io.prestosql.spi.type.StandardTypes;
public final class CreateHll
{
private CreateHll() {}
@ScalarFunction
@SqlType(StandardTypes.HYPER_LOG_LOG)
public static Slice createHll(@SqlType(StandardTypes.BIGINT) long value)
{
HyperLogLog hll = HyperLogLog.newInstance(4096);
hll.add(value);
return hll.serialize();
}
}