/*
* 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.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.type.StandardTypes;
import com.google.common.base.Charsets;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.Ordering;
import com.google.common.primitives.Ints;
import io.airlift.slice.Slice;
import io.airlift.slice.Slices;
import java.util.List;
import static com.facebook.presto.spi.type.VarbinaryType.VARBINARY;
public class TestVarBinaryMinAggregation
extends AbstractTestAggregationFunction
{
@Override
public Block getSequenceBlock(int start, int length)
{
BlockBuilder blockBuilder = VARBINARY.createBlockBuilder(new BlockBuilderStatus());
for (int i = 0; i < length; i++) {
VARBINARY.writeSlice(blockBuilder, Slices.wrappedBuffer(Ints.toByteArray(i)));
}
return blockBuilder.build();
}
@Override
public Object getExpectedValue(int start, int length)
{
if (length == 0) {
return null;
}
Slice min = null;
for (int i = 0; i < length; i++) {
Slice slice = Slices.wrappedBuffer(Ints.toByteArray(i));
min = (min == null) ? slice : Ordering.natural().min(min, slice);
}
return min.toString(Charsets.UTF_8);
}
@Override
protected String getFunctionName()
{
return "min";
}
@Override
protected List<String> getFunctionParameterTypes()
{
return ImmutableList.of(StandardTypes.VARCHAR);
}
}