/*
 * 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.operator.aggregation.state.HyperLogLogState;
import com.facebook.presto.operator.aggregation.state.StateCompiler;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.function.AccumulatorStateSerializer;
import com.facebook.presto.spi.function.AggregationFunction;
import com.facebook.presto.spi.function.InputFunction;
import com.facebook.presto.spi.function.IntermediateInputFunction;
import com.facebook.presto.spi.function.OutputFunction;
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;

@AggregationFunction("merge")
public final class MergeHyperLogLogAggregation
{
    private static final AccumulatorStateSerializer<HyperLogLogState> serializer = new StateCompiler().generateStateSerializer(HyperLogLogState.class);

    private MergeHyperLogLogAggregation() {}

    @InputFunction
    @IntermediateInputFunction
    public static void merge(HyperLogLogState state, @SqlType(StandardTypes.HYPER_LOG_LOG) Slice value)
    {
        HyperLogLog input = HyperLogLog.newInstance(value);

        HyperLogLog previous = state.getHyperLogLog();
        if (previous == null) {
            state.setHyperLogLog(input);
            state.addMemoryUsage(input.estimatedInMemorySize());
        }
        else {
            state.addMemoryUsage(-previous.estimatedInMemorySize());
            previous.mergeWith(input);
            state.addMemoryUsage(previous.estimatedInMemorySize());
        }
    }

    @OutputFunction(StandardTypes.HYPER_LOG_LOG)
    public static void output(HyperLogLogState state, BlockBuilder out)
    {
        serializer.serialize(state, out);
    }
}

@@ -967,21 +967,23 @@
 unction.
-Input
+Combine
 Function
@@ -1024,28 +1024,16 @@
 unction.
-Intermediate
 InputFun
@@ -1577,39 +1577,8 @@
 ion%0A
-    @IntermediateInputFunction%0A
     
@@ -1596,21 +1596,21 @@
 ic void 
-merge
+input
 (HyperLo
@@ -1743,16 +1743,299 @@
 value);%0A
+        merge(state, input);%0A    %7D%0A%0A    @CombineFunction%0A    public static void combine(HyperLogLogState state, HyperLogLogState otherState)%0A    %7B%0A        merge(state, otherState.getHyperLogLog());%0A    %7D%0A%0A    private static void merge(HyperLogLogState state, HyperLogLog input)%0A    %7B
 %0A       

Remove @IntermediateInputFunction in MergeHyperLogLogAggregation