/*
* 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 com.facebook.presto.type;
import com.facebook.presto.spi.function.ScalarOperator;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.type.StandardTypes;
import io.airlift.slice.Slice;
import io.airlift.stats.cardinality.HyperLogLog;
import static com.facebook.presto.spi.function.OperatorType.CAST;
public final class HyperLogLogOperators
{
private HyperLogLogOperators()
{
}
@ScalarOperator(CAST)
@SqlType(StandardTypes.VARBINARY)
public static Slice castToBinary(@SqlType(StandardTypes.HYPER_LOG_LOG) Slice slice)
{
return slice;
}
@ScalarOperator(CAST)
@SqlType(StandardTypes.HYPER_LOG_LOG)
public static Slice castFromVarbinary(@SqlType(StandardTypes.VARBINARY) Slice slice)
{
return slice;
}
@ScalarOperator(CAST)
@SqlType(StandardTypes.P4_HYPER_LOG_LOG)
public static Slice castToP4Hll(@SqlType(StandardTypes.HYPER_LOG_LOG) Slice slice)
{
HyperLogLog hll = HyperLogLog.newInstance(slice);
hll.makeDense();
return hll.serialize();
}
@ScalarOperator(CAST)
@SqlType(StandardTypes.HYPER_LOG_LOG)
public static Slice castFromP4Hll(@SqlType(StandardTypes.P4_HYPER_LOG_LOG) Slice slice)
{
return slice;
}
}