/*
* 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.bytecode.DynamicClassLoader;
import com.facebook.presto.metadata.BoundVariables;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.metadata.SqlAggregationFunction;
import com.facebook.presto.operator.aggregation.state.BlockState;
import com.facebook.presto.operator.aggregation.state.BlockStateSerializer;
import com.facebook.presto.operator.aggregation.state.NullableBooleanState;
import com.facebook.presto.operator.aggregation.state.NullableDoubleState;
import com.facebook.presto.operator.aggregation.state.NullableLongState;
import com.facebook.presto.operator.aggregation.state.SliceState;
import com.facebook.presto.operator.aggregation.state.StateCompiler;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.function.AccumulatorState;
import com.facebook.presto.spi.function.AccumulatorStateSerializer;
import com.facebook.presto.spi.type.Type;
import com.facebook.presto.spi.type.TypeManager;
import com.google.common.collect.ImmutableList;
import io.airlift.slice.Slice;
import java.lang.invoke.MethodHandle;
import java.util.List;
import static com.facebook.presto.metadata.Signature.typeVariable;
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.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.spi.type.TypeSignature.parseTypeSignature;
import static com.facebook.presto.util.Reflection.methodHandle;
import static com.google.common.collect.ImmutableList.toImmutableList;
public class ArbitraryAggregationFunction
extends SqlAggregationFunction
{
public static final ArbitraryAggregationFunction ARBITRARY_AGGREGATION = new ArbitraryAggregationFunction();
private static final String NAME = "arbitrary";
private static final MethodHandle LONG_INPUT_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "input", Type.class, NullableLongState.class, Block.class, int.class);
private static final MethodHandle DOUBLE_INPUT_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "input", Type.class, NullableDoubleState.class, Block.class, int.class);
private static final MethodHandle SLICE_INPUT_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "input", Type.class, SliceState.class, Block.class, int.class);
private static final MethodHandle BOOLEAN_INPUT_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "input", Type.class, NullableBooleanState.class, Block.class, int.class);
private static final MethodHandle BLOCK_INPUT_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "input", Type.class, BlockState.class, Block.class, int.class);
private static final MethodHandle LONG_OUTPUT_FUNCTION = methodHandle(NullableLongState.class, "write", Type.class, NullableLongState.class, BlockBuilder.class);
private static final MethodHandle DOUBLE_OUTPUT_FUNCTION = methodHandle(NullableDoubleState.class, "write", Type.class, NullableDoubleState.class, BlockBuilder.class);
private static final MethodHandle SLICE_OUTPUT_FUNCTION = methodHandle(SliceState.class, "write", Type.class, SliceState.class, BlockBuilder.class);
private static final MethodHandle BOOLEAN_OUTPUT_FUNCTION = methodHandle(NullableBooleanState.class, "write", Type.class, NullableBooleanState.class, BlockBuilder.class);
private static final MethodHandle BLOCK_OUTPUT_FUNCTION = methodHandle(BlockState.class, "write", Type.class, BlockState.class, BlockBuilder.class);
private static final MethodHandle LONG_COMBINE_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "combine", NullableLongState.class, NullableLongState.class);
private static final MethodHandle DOUBLE_COMBINE_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "combine", NullableDoubleState.class, NullableDoubleState.class);
private static final MethodHandle SLICE_COMBINE_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "combine", SliceState.class, SliceState.class);
private static final MethodHandle BOOLEAN_COMBINE_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "combine", NullableBooleanState.class, NullableBooleanState.class);
private static final MethodHandle BLOCK_COMBINE_FUNCTION = methodHandle(ArbitraryAggregationFunction.class, "combine", BlockState.class, BlockState.class);
protected ArbitraryAggregationFunction()
{
super(NAME,
ImmutableList.of(typeVariable("T")),
ImmutableList.of(),
parseTypeSignature("T"),
ImmutableList.of(parseTypeSignature("T")));
}
@Override
public String getDescription()
{
return "return an arbitrary non-null input value";
}
@Override
public InternalAggregationFunction specialize(BoundVariables boundVariables, int arity, TypeManager typeManager, FunctionRegistry functionRegistry)
{
Type valueType = boundVariables.getTypeVariable("T");
return generateAggregation(valueType);
}
private static InternalAggregationFunction generateAggregation(Type type)
{
DynamicClassLoader classLoader = new DynamicClassLoader(ArbitraryAggregationFunction.class.getClassLoader());
List<Type> inputTypes = ImmutableList.of(type);
MethodHandle inputFunction;
MethodHandle combineFunction;
MethodHandle outputFunction;
Class<? extends AccumulatorState> stateInterface;
AccumulatorStateSerializer<?> stateSerializer;
if (type.getJavaType() == long.class) {
stateInterface = NullableLongState.class;
stateSerializer = StateCompiler.generateStateSerializer(stateInterface, classLoader);
inputFunction = LONG_INPUT_FUNCTION;
combineFunction = LONG_COMBINE_FUNCTION;
outputFunction = LONG_OUTPUT_FUNCTION;
}
else if (type.getJavaType() == double.class) {
stateInterface = NullableDoubleState.class;
stateSerializer = StateCompiler.generateStateSerializer(stateInterface, classLoader);
inputFunction = DOUBLE_INPUT_FUNCTION;
combineFunction = DOUBLE_COMBINE_FUNCTION;
outputFunction = DOUBLE_OUTPUT_FUNCTION;
}
else if (type.getJavaType() == Slice.class) {
stateInterface = SliceState.class;
stateSerializer = StateCompiler.generateStateSerializer(stateInterface, classLoader);
inputFunction = SLICE_INPUT_FUNCTION;
combineFunction = SLICE_COMBINE_FUNCTION;
outputFunction = SLICE_OUTPUT_FUNCTION;
}
else if (type.getJavaType() == boolean.class) {
stateInterface = NullableBooleanState.class;
stateSerializer = StateCompiler.generateStateSerializer(stateInterface, classLoader);
inputFunction = BOOLEAN_INPUT_FUNCTION;
combineFunction = BOOLEAN_COMBINE_FUNCTION;
outputFunction = BOOLEAN_OUTPUT_FUNCTION;
}
else {
stateInterface = BlockState.class;
stateSerializer = new BlockStateSerializer(type);
inputFunction = BLOCK_INPUT_FUNCTION;
combineFunction = BLOCK_COMBINE_FUNCTION;
outputFunction = BLOCK_OUTPUT_FUNCTION;
}
inputFunction = inputFunction.bindTo(type);
Type intermediateType = stateSerializer.getSerializedType();
List<ParameterMetadata> inputParameterMetadata = createInputParameterMetadata(type);
AggregationMetadata metadata = new AggregationMetadata(
generateAggregationName(NAME, type.getTypeSignature(), inputTypes.stream().map(Type::getTypeSignature).collect(toImmutableList())),
inputParameterMetadata,
inputFunction,
combineFunction,
outputFunction.bindTo(type),
stateInterface,
stateSerializer,
StateCompiler.generateStateFactory(stateInterface, classLoader),
type);
GenericAccumulatorFactoryBinder factory = AccumulatorCompiler.generateAccumulatorFactoryBinder(metadata, classLoader);
return new InternalAggregationFunction(NAME, inputTypes, intermediateType, type, true, factory);
}
private static List<ParameterMetadata> createInputParameterMetadata(Type value)
{
return ImmutableList.of(new ParameterMetadata(STATE), new ParameterMetadata(BLOCK_INPUT_CHANNEL, value), new ParameterMetadata(BLOCK_INDEX));
}
public static void input(Type type, NullableDoubleState state, Block block, int position)
{
if (!state.isNull()) {
return;
}
state.setNull(false);
state.setDouble(type.getDouble(block, position));
}
public static void input(Type type, NullableLongState state, Block block, int position)
{
if (!state.isNull()) {
return;
}
state.setNull(false);
state.setLong(type.getLong(block, position));
}
public static void input(Type type, SliceState state, Block block, int position)
{
if (state.getSlice() != null) {
return;
}
state.setSlice(type.getSlice(block, position));
}
public static void input(Type type, NullableBooleanState state, Block block, int position)
{
if (!state.isNull()) {
return;
}
state.setNull(false);
state.setBoolean(type.getBoolean(block, position));
}
public static void input(Type type, BlockState state, Block block, int position)
{
if (state.getBlock() != null) {
return;
}
state.setBlock((Block) type.getObject(block, position));
}
public static void combine(NullableLongState state, NullableLongState otherState)
{
if (!state.isNull()) {
return;
}
state.setNull(false);
state.setLong(otherState.getLong());
}
public static void combine(NullableDoubleState state, NullableDoubleState otherState)
{
if (!state.isNull()) {
return;
}
state.setNull(false);
state.setDouble(otherState.getDouble());
}
public static void combine(NullableBooleanState state, NullableBooleanState otherState)
{
if (!state.isNull()) {
return;
}
state.setNull(false);
state.setBoolean(otherState.getBoolean());
}
public static void combine(SliceState state, SliceState otherState)
{
if (state.getSlice() != null) {
return;
}
state.setSlice(otherState.getSlice());
}
public static void combine(BlockState state, BlockState otherState)
{
if (state.getBlock() != null) {
return;
}
state.setBlock(otherState.getBlock());
}
}