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io.trino.operator.scalar.AbstractGreatestLeast Maven / Gradle / Ivy
/*
* 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.airlift.bytecode.BytecodeBlock;
import io.airlift.bytecode.ClassDefinition;
import io.airlift.bytecode.DynamicClassLoader;
import io.airlift.bytecode.MethodDefinition;
import io.airlift.bytecode.Parameter;
import io.airlift.bytecode.Scope;
import io.airlift.bytecode.Variable;
import io.airlift.bytecode.control.IfStatement;
import io.airlift.bytecode.expression.BytecodeExpression;
import io.airlift.bytecode.instruction.LabelNode;
import io.trino.metadata.SqlScalarFunction;
import io.trino.spi.function.BoundSignature;
import io.trino.spi.function.FunctionDependencies;
import io.trino.spi.function.FunctionDependencyDeclaration;
import io.trino.spi.function.FunctionMetadata;
import io.trino.spi.function.Signature;
import io.trino.spi.type.Type;
import io.trino.spi.type.TypeSignature;
import io.trino.sql.gen.CallSiteBinder;
import java.lang.invoke.MethodHandle;
import java.util.List;
import java.util.stream.IntStream;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.collect.ImmutableList.toImmutableList;
import static com.google.common.primitives.Primitives.wrap;
import static io.airlift.bytecode.Access.FINAL;
import static io.airlift.bytecode.Access.PRIVATE;
import static io.airlift.bytecode.Access.PUBLIC;
import static io.airlift.bytecode.Access.STATIC;
import static io.airlift.bytecode.Access.a;
import static io.airlift.bytecode.Parameter.arg;
import static io.airlift.bytecode.ParameterizedType.type;
import static io.airlift.bytecode.expression.BytecodeExpressions.constantNull;
import static io.airlift.bytecode.expression.BytecodeExpressions.invokeDynamic;
import static io.airlift.bytecode.expression.BytecodeExpressions.isNull;
import static io.airlift.bytecode.expression.BytecodeExpressions.or;
import static io.trino.spi.StandardErrorCode.NOT_SUPPORTED;
import static io.trino.spi.function.InvocationConvention.InvocationArgumentConvention.BOXED_NULLABLE;
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.function.InvocationConvention.InvocationReturnConvention.NULLABLE_RETURN;
import static io.trino.spi.function.InvocationConvention.simpleConvention;
import static io.trino.sql.gen.Bootstrap.BOOTSTRAP_METHOD;
import static io.trino.util.CompilerUtils.defineClass;
import static io.trino.util.CompilerUtils.makeClassName;
import static io.trino.util.Failures.checkCondition;
import static io.trino.util.MinMaxCompare.getMinMaxCompare;
import static io.trino.util.MinMaxCompare.getMinMaxCompareFunctionDependencies;
import static io.trino.util.Reflection.methodHandle;
import static java.lang.invoke.MethodType.methodType;
import static java.util.Collections.nCopies;
import static java.util.stream.Collectors.joining;
public abstract class AbstractGreatestLeast
extends SqlScalarFunction
{
private final boolean min;
protected AbstractGreatestLeast(boolean min, String description)
{
super(FunctionMetadata.scalarBuilder(min ? "least" : "greatest")
.signature(Signature.builder()
.orderableTypeParameter("E")
.returnType(new TypeSignature("E"))
.argumentType(new TypeSignature("E"))
.variableArity()
.build())
.nullable()
.argumentNullability(true)
.description(description)
.build());
this.min = min;
}
@Override
public FunctionDependencyDeclaration getFunctionDependencies()
{
return getMinMaxCompareFunctionDependencies(new TypeSignature("E"), min);
}
@Override
public SpecializedSqlScalarFunction specialize(BoundSignature boundSignature, FunctionDependencies functionDependencies)
{
Type type = boundSignature.getReturnType();
checkArgument(type.isOrderable(), "Type must be orderable");
MethodHandle compareMethod = getMinMaxCompare(functionDependencies, type, simpleConvention(FAIL_ON_NULL, NEVER_NULL, NEVER_NULL), min);
List> javaTypes = IntStream.range(0, boundSignature.getArity())
.mapToObj(i -> wrap(type.getJavaType()))
.collect(toImmutableList());
MethodHandle methodHandle = generate(boundSignature.getName().getFunctionName(), javaTypes, compareMethod);
return new ChoicesSpecializedSqlScalarFunction(
boundSignature,
NULLABLE_RETURN,
nCopies(javaTypes.size(), BOXED_NULLABLE),
methodHandle);
}
private MethodHandle generate(String functionName, List> javaTypes, MethodHandle compareMethod)
{
checkCondition(javaTypes.size() <= 127, NOT_SUPPORTED, "Too many arguments for function call %s()", functionName);
String javaTypeName = javaTypes.stream()
.map(Class::getSimpleName)
.collect(joining());
ClassDefinition definition = new ClassDefinition(
a(PUBLIC, FINAL),
makeClassName(javaTypeName + "$" + functionName),
type(Object.class));
definition.declareDefaultConstructor(a(PRIVATE));
List parameters = IntStream.range(0, javaTypes.size())
.mapToObj(i -> arg("arg" + i, javaTypes.get(i)))
.collect(toImmutableList());
MethodDefinition method = definition.declareMethod(
a(PUBLIC, STATIC),
functionName,
type(wrap(javaTypes.get(0))),
parameters);
Scope scope = method.getScope();
BytecodeBlock body = method.getBody();
CallSiteBinder binder = new CallSiteBinder();
Variable value = scope.declareVariable(wrap(javaTypes.get(0)), "value");
BytecodeExpression nullValue = constantNull(wrap(javaTypes.get(0)));
body.append(value.set(nullValue));
LabelNode done = new LabelNode("done");
compareMethod = compareMethod.asType(methodType(boolean.class, compareMethod.type().wrap().parameterList()));
for (int i = 0; i < javaTypes.size(); i++) {
Parameter parameter = parameters.get(i);
BytecodeExpression invokeCompare = invokeDynamic(
BOOTSTRAP_METHOD,
ImmutableList.of(binder.bind(compareMethod).getBindingId()),
"compare",
boolean.class,
parameter,
value);
body.append(new IfStatement()
.condition(isNull(parameter))
.ifTrue(new BytecodeBlock()
.append(value.set(nullValue))
.gotoLabel(done)));
body.append(new IfStatement()
.condition(or(isNull(value), invokeCompare))
.ifTrue(value.set(parameter)));
}
body.visitLabel(done);
body.append(value.ret());
Class clazz = defineClass(definition, Object.class, binder.getBindings(), new DynamicClassLoader(getClass().getClassLoader()));
return methodHandle(clazz, method.getName(), javaTypes.toArray(new Class[0]));
}
}
