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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 io.trino.operator.scalar;
import com.google.common.collect.ImmutableList;
import io.trino.metadata.SqlScalarFunction;
import io.trino.spi.block.Block;
import io.trino.spi.block.BufferedArrayValueBuilder;
import io.trino.spi.function.BoundSignature;
import io.trino.spi.function.FunctionMetadata;
import io.trino.spi.function.Signature;
import io.trino.spi.type.ArrayType;
import io.trino.spi.type.Type;
import io.trino.spi.type.TypeSignature;
import io.trino.sql.gen.lambda.BinaryFunctionInterface;
import java.lang.invoke.MethodHandle;
import java.util.Optional;
import static io.trino.spi.function.InvocationConvention.InvocationArgumentConvention.FUNCTION;
import static io.trino.spi.function.InvocationConvention.InvocationArgumentConvention.NEVER_NULL;
import static io.trino.spi.function.InvocationConvention.InvocationReturnConvention.FAIL_ON_NULL;
import static io.trino.spi.type.TypeSignature.arrayType;
import static io.trino.spi.type.TypeSignature.functionType;
import static io.trino.spi.type.TypeUtils.readNativeValue;
import static io.trino.spi.type.TypeUtils.writeNativeValue;
import static io.trino.util.Reflection.methodHandle;
import static java.lang.Math.max;
public final class ZipWithFunction
extends SqlScalarFunction
{
public static final ZipWithFunction ZIP_WITH_FUNCTION = new ZipWithFunction();
private static final MethodHandle METHOD_HANDLE = methodHandle(ZipWithFunction.class, "zipWith", Type.class, Type.class, ArrayType.class, Object.class, Block.class, Block.class, BinaryFunctionInterface.class);
private static final MethodHandle STATE_FACTORY = methodHandle(ZipWithFunction.class, "createState", ArrayType.class);
private ZipWithFunction()
{
super(FunctionMetadata.scalarBuilder("zip_with")
.signature(Signature.builder()
.typeVariable("T")
.typeVariable("U")
.typeVariable("R")
.returnType(arrayType(new TypeSignature("R")))
.argumentType(arrayType(new TypeSignature("T")))
.argumentType(arrayType(new TypeSignature("U")))
.argumentType(functionType(new TypeSignature("T"), new TypeSignature("U"), new TypeSignature("R")))
.build())
.nondeterministic()
.description("Merge two arrays, element-wise, into a single array using the lambda function")
.build());
}
@Override
protected SpecializedSqlScalarFunction specialize(BoundSignature boundSignature)
{
Type leftElementType = ((ArrayType) boundSignature.getArgumentType(0)).getElementType();
Type rightElementType = ((ArrayType) boundSignature.getArgumentType(1)).getElementType();
Type outputElementType = ((ArrayType) boundSignature.getReturnType()).getElementType();
ArrayType outputArrayType = new ArrayType(outputElementType);
return new ChoicesSpecializedSqlScalarFunction(
boundSignature,
FAIL_ON_NULL,
ImmutableList.of(NEVER_NULL, NEVER_NULL, FUNCTION),
ImmutableList.of(BinaryFunctionInterface.class),
METHOD_HANDLE.bindTo(leftElementType).bindTo(rightElementType).bindTo(outputArrayType),
Optional.of(STATE_FACTORY.bindTo(outputArrayType)));
}
public static Object createState(ArrayType arrayType)
{
return BufferedArrayValueBuilder.createBuffered(arrayType);
}
public static Block zipWith(
Type leftElementType,
Type rightElementType,
ArrayType outputArrayType,
Object state,
Block leftBlock,
Block rightBlock,
BinaryFunctionInterface function)
{
Type outputElementType = outputArrayType.getElementType();
int leftPositionCount = leftBlock.getPositionCount();
int rightPositionCount = rightBlock.getPositionCount();
int outputPositionCount = max(leftPositionCount, rightPositionCount);
BufferedArrayValueBuilder arrayValueBuilder = (BufferedArrayValueBuilder) state;
return arrayValueBuilder.build(outputPositionCount, valueBuilder -> {
for (int position = 0; position < outputPositionCount; position++) {
Object left = position < leftPositionCount ? readNativeValue(leftElementType, leftBlock, position) : null;
Object right = position < rightPositionCount ? readNativeValue(rightElementType, rightBlock, position) : null;
Object output = function.apply(left, right);
writeNativeValue(outputElementType, valueBuilder, output);
}
});
}
}
