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 /*
  * 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 static com.facebook.presto.operator.aggregation.ApproximateUtils.countError;
import static com.facebook.presto.operator.aggregation.ApproximateUtils.formatApproximateResult;
import static com.facebook.presto.spi.type.VarcharType.VARCHAR;
@AggregationFunction(value = "count", approximate = true)
    public static void booleanInput(ApproximateCountState state, @BlockPosition @SqlType(.Block block, @BlockIndex int index, @SampleWeight long sampleWeight)
    {
        state.setCount(state.getCount() + sampleWeight);
        state.setSamples(state.getSamples() + 1);
    }
    public static void bigintInput(ApproximateCountState state, @BlockPosition @SqlType(.Block block, @BlockIndex int index, @SampleWeight long sampleWeight)
    {
        state.setCount(state.getCount() + sampleWeight);
        state.setSamples(state.getSamples() + 1);
    }
    public static void doubleInput(ApproximateCountState state, @BlockPosition @SqlType(.Block block, @BlockIndex int index, @SampleWeight long sampleWeight)
    {
        state.setCount(state.getCount() + sampleWeight);
        state.setSamples(state.getSamples() + 1);
    }
    public static void varcharInput(ApproximateCountState state, @BlockPosition @SqlType(.Block block, @BlockIndex int index, @SampleWeight long sampleWeight)
    {
        state.setCount(state.getCount() + sampleWeight);
        state.setSamples(state.getSamples() + 1);
    }
    public static void combine(ApproximateCountState stateApproximateCountState otherState)
    {
        state.setCount(state.getCount() + otherState.getCount());
        state.setSamples(state.getSamples() + otherState.getSamples());
    }
    public static void output(ApproximateCountState statedouble confidenceBlockBuilder out)
    {
        String result = formatApproximateResult(state.getCount(), countError(state.getSamples(), state.getCount()), confidencetrue);
        .writeSlice(out, Slices.utf8Slice(result));
    }
    public interface ApproximateCountState
            extends AccumulatorState
    {
        long getCount();
        void setCount(long value);
        long getSamples();
        void setSamples(long value);
    }
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