text: /*
   * 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.operator.aggregation;
  
  import com.google.common.collect.ImmutableList;
  import io.prestosql.spi.block.Block;
  import io.prestosql.spi.block.BlockBuilder;
  import io.prestosql.spi.type.Type;
  
  import java.util.List;
  
  import static io.prestosql.spi.type.DoubleType.DOUBLE;
  
  public class TestLongGeometricMeanAggregationFunction
          extends AbstractTestAggregationFunction
  {
      @Override
      protected Block[] getSequenceBlocks(int start, int length)
      {
          BlockBuilder blockBuilder = DOUBLE.createBlockBuilder(null, length);
          for (int i = start; i < start + length; i++) {
              DOUBLE.writeDouble(blockBuilder, (double) i);
          }
          return new Block[] {blockBuilder.build()};
      }
  
      @Override
      protected Number getExpectedValue(int start, int length)
      {
          if (length == 0) {
              return null;
          }
  
          double product = 1.0d;
          for (int i = start; i < start + length; i++) {
              product *= i;
          }
          return Math.pow(product, 1.0d / length);
      }
  
      @Override
      protected String getFunctionName()
      {
          return "geometric_mean";
      }
  
      @Override
      protected List<Type> getFunctionParameterTypes()
      {
          return ImmutableList.of(DOUBLE);
      }
  }
  