/*
* 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.operator.aggregation;
import com.facebook.presto.metadata.Signature;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.VarcharType;
import io.airlift.slice.Slices;
import java.util.concurrent.ThreadLocalRandom;
import static com.facebook.presto.metadata.FunctionKind.AGGREGATE;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.DoubleType.DOUBLE;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
public class TestApproximateCountDistinctVarBinary
extends AbstractTestApproximateCountDistinct
{
@Override
public InternalAggregationFunction getAggregationFunction()
{
return metadata.getFunctionRegistry().getAggregateFunctionImplementation(
new Signature("approx_distinct", AGGREGATE, BIGINT.getTypeSignature(), parseTypeSignature("varchar"), DOUBLE.getTypeSignature()));
}
@Override
public Type getValueType()
{
return VarcharType.VARCHAR;
}
@Override
public Object randomValue()
{
int length = ThreadLocalRandom.current().nextInt(100);
byte[] bytes = new byte[length];
ThreadLocalRandom.current().nextBytes(bytes);
return Slices.wrappedBuffer(bytes);
}
}