/*
* 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.scalar;
import com.facebook.presto.annotation.UsedByGeneratedCode;
import com.facebook.presto.metadata.BoundVariables;
import com.facebook.presto.metadata.FunctionRegistry;
import com.facebook.presto.metadata.SqlOperator;
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
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 static com.facebook.presto.metadata.Signature.typeVariable;
import static com.facebook.presto.spi.StandardErrorCode.INVALID_FUNCTION_ARGUMENT;
import static com.facebook.presto.spi.function.OperatorType.SUBSCRIPT;
import static com.facebook.presto.spi.type.TypeSignature.parseTypeSignature;
import static com.facebook.presto.util.Reflection.methodHandle;
import static com.google.common.base.Preconditions.checkArgument;
import static java.lang.Math.toIntExact;
import static java.util.Objects.requireNonNull;
public class ArraySubscriptOperator
extends SqlOperator
{
public static final ArraySubscriptOperator ARRAY_SUBSCRIPT = new ArraySubscriptOperator();
private static final MethodHandle METHOD_HANDLE_UNKNOWN = methodHandle(ArraySubscriptOperator.class, "arrayWithUnknownType", Type.class, Block.class, long.class);
private static final MethodHandle METHOD_HANDLE_BOOLEAN = methodHandle(ArraySubscriptOperator.class, "booleanSubscript", Type.class, Block.class, long.class);
private static final MethodHandle METHOD_HANDLE_LONG = methodHandle(ArraySubscriptOperator.class, "longSubscript", Type.class, Block.class, long.class);
private static final MethodHandle METHOD_HANDLE_DOUBLE = methodHandle(ArraySubscriptOperator.class, "doubleSubscript", Type.class, Block.class, long.class);
private static final MethodHandle METHOD_HANDLE_SLICE = methodHandle(ArraySubscriptOperator.class, "sliceSubscript", Type.class, Block.class, long.class);
private static final MethodHandle METHOD_HANDLE_OBJECT = methodHandle(ArraySubscriptOperator.class, "objectSubscript", Type.class, Block.class, long.class);
protected ArraySubscriptOperator()
{
super(SUBSCRIPT,
ImmutableList.of(typeVariable("E")),
ImmutableList.of(),
parseTypeSignature("E"),
ImmutableList.of(parseTypeSignature("array(E)"), parseTypeSignature("bigint")));
}
@Override
public ScalarFunctionImplementation specialize(BoundVariables boundVariables, int arity, TypeManager typeManager, FunctionRegistry functionRegistry)
{
checkArgument(boundVariables.getTypeVariables().size() == 1, "Expected one type, got %s", boundVariables.getTypeVariables());
Type elementType = boundVariables.getTypeVariable("E");
MethodHandle methodHandle;
if (elementType.getJavaType() == void.class) {
methodHandle = METHOD_HANDLE_UNKNOWN;
}
else if (elementType.getJavaType() == boolean.class) {
methodHandle = METHOD_HANDLE_BOOLEAN;
}
else if (elementType.getJavaType() == long.class) {
methodHandle = METHOD_HANDLE_LONG;
}
else if (elementType.getJavaType() == double.class) {
methodHandle = METHOD_HANDLE_DOUBLE;
}
else if (elementType.getJavaType() == Slice.class) {
methodHandle = METHOD_HANDLE_SLICE;
}
else {
methodHandle = METHOD_HANDLE_OBJECT;
}
methodHandle = methodHandle.bindTo(elementType);
requireNonNull(methodHandle, "methodHandle is null");
return new ScalarFunctionImplementation(true, ImmutableList.of(false, false), methodHandle, isDeterministic());
}
@UsedByGeneratedCode
public static void arrayWithUnknownType(Type elementType, Block array, long index)
{
checkIndex(array, index);
}
@UsedByGeneratedCode
public static Long longSubscript(Type elementType, Block array, long index)
{
checkIndex(array, index);
int position = toIntExact(index - 1);
if (array.isNull(position)) {
return null;
}
return elementType.getLong(array, position);
}
@UsedByGeneratedCode
public static Boolean booleanSubscript(Type elementType, Block array, long index)
{
checkIndex(array, index);
int position = toIntExact(index - 1);
if (array.isNull(position)) {
return null;
}
return elementType.getBoolean(array, position);
}
@UsedByGeneratedCode
public static Double doubleSubscript(Type elementType, Block array, long index)
{
checkIndex(array, index);
int position = toIntExact(index - 1);
if (array.isNull(position)) {
return null;
}
return elementType.getDouble(array, position);
}
@UsedByGeneratedCode
public static Slice sliceSubscript(Type elementType, Block array, long index)
{
checkIndex(array, index);
int position = toIntExact(index - 1);
if (array.isNull(position)) {
return null;
}
return elementType.getSlice(array, position);
}
@UsedByGeneratedCode
public static Object objectSubscript(Type elementType, Block array, long index)
{
checkIndex(array, index);
int position = toIntExact(index - 1);
if (array.isNull(position)) {
return null;
}
return elementType.getObject(array, position);
}
public static void checkArrayIndex(long index)
{
if (index == 0) {
throw new PrestoException(INVALID_FUNCTION_ARGUMENT, "SQL array indices start at 1");
}
if (index < 0) {
throw new PrestoException(INVALID_FUNCTION_ARGUMENT, "Array subscript is negative");
}
}
public static void checkIndex(Block array, long index)
{
checkArrayIndex(index);
if (index > array.getPositionCount()) {
throw new PrestoException(INVALID_FUNCTION_ARGUMENT, "Array subscript out of bounds");
}
}
}