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presto-main/src/main/java/com/facebook/presto/operator/aggregation/AbstractMinMaxBy.java
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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; | ||
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import com.facebook.presto.byteCode.DynamicClassLoader; | ||
import com.facebook.presto.metadata.FunctionInfo; | ||
import com.facebook.presto.metadata.FunctionRegistry; | ||
import com.facebook.presto.metadata.ParametricAggregation; | ||
import com.facebook.presto.metadata.Signature; | ||
import com.facebook.presto.operator.aggregation.state.MaxOrMinByState; | ||
import com.facebook.presto.operator.aggregation.state.MaxOrMinByStateFactory; | ||
import com.facebook.presto.operator.aggregation.state.MaxOrMinByStateSerializer; | ||
import com.facebook.presto.spi.block.Block; | ||
import com.facebook.presto.spi.block.BlockBuilder; | ||
import com.facebook.presto.spi.type.Type; | ||
import com.facebook.presto.spi.type.TypeManager; | ||
import com.google.common.collect.ImmutableList; | ||
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import java.lang.invoke.MethodHandle; | ||
import java.util.List; | ||
import java.util.Map; | ||
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import static com.facebook.presto.metadata.Signature.orderableTypeParameter; | ||
import static com.facebook.presto.metadata.Signature.typeParameter; | ||
import static com.facebook.presto.operator.aggregation.AggregationMetadata.ParameterMetadata; | ||
import static com.facebook.presto.operator.aggregation.AggregationMetadata.ParameterMetadata.ParameterType.BLOCK_INDEX; | ||
import static com.facebook.presto.operator.aggregation.AggregationMetadata.ParameterMetadata.ParameterType.NULLABLE_BLOCK_INPUT_CHANNEL; | ||
import static com.facebook.presto.operator.aggregation.AggregationMetadata.ParameterMetadata.ParameterType.STATE; | ||
import static com.facebook.presto.operator.aggregation.AggregationUtils.generateAggregationName; | ||
import static com.facebook.presto.util.Reflection.methodHandle; | ||
import static java.lang.invoke.MethodHandles.insertArguments; | ||
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public abstract class AbstractMinMaxBy | ||
extends ParametricAggregation | ||
{ | ||
private static final MethodHandle OUTPUT_FUNCTION = methodHandle(AbstractMinMaxBy.class, "output", Type.class, MaxOrMinByState.class, BlockBuilder.class); | ||
private static final MethodHandle INPUT_FUNCTION = methodHandle(AbstractMinMaxBy.class, "input", boolean.class, Type.class, MaxOrMinByState.class, Block.class, Block.class, int.class); | ||
private static final MethodHandle COMBINE_FUNCTION = methodHandle(AbstractMinMaxBy.class, "combine", boolean.class, Type.class, MaxOrMinByState.class, MaxOrMinByState.class); | ||
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private final String name; | ||
private final Signature signature; | ||
private final boolean min; | ||
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protected AbstractMinMaxBy(boolean min) | ||
{ | ||
this.name = (min ? "min" : "max") + "_by"; | ||
this.signature = new Signature(name, ImmutableList.of(orderableTypeParameter("K"), typeParameter("V")), "V", ImmutableList.of("V", "K"), false, false); | ||
this.min = min; | ||
} | ||
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@Override | ||
public Signature getSignature() | ||
{ | ||
return signature; | ||
} | ||
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@Override | ||
public FunctionInfo specialize(Map<String, Type> types, int arity, TypeManager typeManager, FunctionRegistry functionRegistry) | ||
{ | ||
Type keyType = types.get("K"); | ||
Type valueType = types.get("V"); | ||
Signature signature = new Signature(name, valueType.getTypeSignature(), valueType.getTypeSignature(), keyType.getTypeSignature()); | ||
InternalAggregationFunction aggregation = generateAggregation(valueType, keyType); | ||
return new FunctionInfo(signature, getDescription(), aggregation); | ||
} | ||
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private InternalAggregationFunction generateAggregation(Type valueType, Type keyType) | ||
{ | ||
DynamicClassLoader classLoader = new DynamicClassLoader(getClass().getClassLoader()); | ||
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MaxOrMinByStateSerializer stateSerializer = new MaxOrMinByStateSerializer(valueType, keyType); | ||
Type intermediateType = stateSerializer.getSerializedType(); | ||
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List<Type> inputTypes = ImmutableList.of(valueType, keyType); | ||
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MaxOrMinByStateFactory stateFactory = new MaxOrMinByStateFactory(); | ||
AggregationMetadata metadata = new AggregationMetadata( | ||
generateAggregationName(name, valueType, inputTypes), | ||
createInputParameterMetadata(valueType, keyType), | ||
insertArguments(INPUT_FUNCTION, 0, min).bindTo(keyType), | ||
null, | ||
null, | ||
insertArguments(COMBINE_FUNCTION, 0, min).bindTo(keyType), | ||
OUTPUT_FUNCTION.bindTo(valueType), | ||
MaxOrMinByState.class, | ||
stateSerializer, | ||
stateFactory, | ||
valueType, | ||
false); | ||
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GenericAccumulatorFactoryBinder factory = new AccumulatorCompiler().generateAccumulatorFactoryBinder(metadata, classLoader); | ||
return new InternalAggregationFunction(name, inputTypes, intermediateType, valueType, true, false, factory); | ||
} | ||
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private static List<ParameterMetadata> createInputParameterMetadata(Type value, Type key) | ||
{ | ||
return ImmutableList.of(new ParameterMetadata(STATE), new ParameterMetadata(NULLABLE_BLOCK_INPUT_CHANNEL, value), new ParameterMetadata(NULLABLE_BLOCK_INPUT_CHANNEL, key), new ParameterMetadata(BLOCK_INDEX)); | ||
} | ||
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public static void input(boolean min, Type keyType, MaxOrMinByState state, Block value, Block key, int position) | ||
{ | ||
if ((state.getKey() == null) || state.getKey().isNull(0) || | ||
compare(keyType.compareTo(key, position, state.getKey(), 0), min)) { | ||
state.setKey(key.getSingleValueBlock(position)); | ||
state.setValue(value.getSingleValueBlock(position)); | ||
} | ||
} | ||
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public static void combine(boolean min, Type keyType, MaxOrMinByState state, MaxOrMinByState otherState) | ||
{ | ||
Block key = state.getKey(); | ||
Block otherKey = otherState.getKey(); | ||
if ((key == null) || ((otherKey != null) && compare(keyType.compareTo(otherKey, 0, key, 0), min))) { | ||
state.setKey(otherKey); | ||
state.setValue(otherState.getValue()); | ||
} | ||
} | ||
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public static void output(Type valueType, MaxOrMinByState state, BlockBuilder out) | ||
{ | ||
if (state.getValue() == null) { | ||
out.appendNull(); | ||
} | ||
else { | ||
valueType.appendTo(state.getValue(), 0, out); | ||
} | ||
} | ||
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private static boolean compare(int value, boolean lessThan) | ||
{ | ||
return lessThan ? (value < 0) : (value > 0); | ||
} | ||
} |
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