package com.facebook.presto.operator.scalar;
/*
* 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.
*/
import com.facebook.presto.spi.PrestoException;
import com.facebook.presto.spi.StandardErrorCode;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.function.OperatorDependency;
import com.facebook.presto.spi.function.ScalarOperator;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.function.TypeParameter;
import com.facebook.presto.spi.function.TypeParameterSpecialization;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.spi.type.Type;
import com.google.common.base.Throwables;
import io.airlift.slice.Slice;
import java.lang.invoke.MethodHandle;
import static com.facebook.presto.spi.function.OperatorType.HASH_CODE;
import static com.facebook.presto.spi.type.TypeUtils.readNativeValue;
import static com.facebook.presto.type.TypeUtils.NULL_HASH_CODE;
@ScalarOperator(HASH_CODE)
public final class ArrayHashCodeOperator
{
private ArrayHashCodeOperator() {}
@TypeParameter("T")
@SqlType(StandardTypes.BIGINT)
public static long hash(
@OperatorDependency(operator = HASH_CODE, returnType = StandardTypes.BIGINT, argumentTypes = {"T"}) MethodHandle hashFunction,
@TypeParameter("T") Type type,
@SqlType("array(T)") Block block)
{
try {
long hash = 0;
for (int i = 0; i < block.getPositionCount(); i++) {
hash = CombineHashFunction.getHash(hash, block.isNull(i) ? NULL_HASH_CODE : (long) hashFunction.invoke(readNativeValue(type, block, i)));
}
return hash;
}
catch (Throwable t) {
throw internalError(t);
}
}
@TypeParameter("T")
@TypeParameterSpecialization(name = "T", nativeContainerType = long.class)
@SqlType(StandardTypes.BIGINT)
public static long hashLong(
@OperatorDependency(operator = HASH_CODE, returnType = StandardTypes.BIGINT, argumentTypes = {"T"}) MethodHandle hashFunction,
@TypeParameter("T") Type type,
@SqlType("array(T)") Block block)
{
try {
long hash = 0;
for (int i = 0; i < block.getPositionCount(); i++) {
hash = CombineHashFunction.getHash(hash, block.isNull(i) ? NULL_HASH_CODE : (long) hashFunction.invokeExact(type.getLong(block, i)));
}
return hash;
}
catch (Throwable t) {
throw internalError(t);
}
}
@TypeParameter("T")
@TypeParameterSpecialization(name = "T", nativeContainerType = boolean.class)
@SqlType(StandardTypes.BIGINT)
public static long hashBoolean(
@OperatorDependency(operator = HASH_CODE, returnType = StandardTypes.BIGINT, argumentTypes = {"T"}) MethodHandle hashFunction,
@TypeParameter("T") Type type,
@SqlType("array(T)") Block block)
{
try {
long hash = 0;
for (int i = 0; i < block.getPositionCount(); i++) {
hash = CombineHashFunction.getHash(hash, block.isNull(i) ? NULL_HASH_CODE : (long) hashFunction.invokeExact(type.getBoolean(block, i)));
}
return hash;
}
catch (Throwable t) {
throw internalError(t);
}
}
@TypeParameter("T")
@TypeParameterSpecialization(name = "T", nativeContainerType = Slice.class)
@SqlType(StandardTypes.BIGINT)
public static long hashSlice(
@OperatorDependency(operator = HASH_CODE, returnType = StandardTypes.BIGINT, argumentTypes = {"T"}) MethodHandle hashFunction,
@TypeParameter("T") Type type,
@SqlType("array(T)") Block block)
{
try {
long hash = 0;
for (int i = 0; i < block.getPositionCount(); i++) {
hash = CombineHashFunction.getHash(hash, block.isNull(i) ? NULL_HASH_CODE : (long) hashFunction.invokeExact(type.getSlice(block, i)));
}
return hash;
}
catch (Throwable t) {
throw internalError(t);
}
}
@TypeParameter("T")
@TypeParameterSpecialization(name = "T", nativeContainerType = double.class)
@SqlType(StandardTypes.BIGINT)
public static long hashDouble(
@OperatorDependency(operator = HASH_CODE, returnType = StandardTypes.BIGINT, argumentTypes = {"T"}) MethodHandle hashFunction,
@TypeParameter("T") Type type,
@SqlType("array(T)") Block block)
{
try {
long hash = 0;
for (int i = 0; i < block.getPositionCount(); i++) {
hash = CombineHashFunction.getHash(hash, block.isNull(i) ? NULL_HASH_CODE : (long) hashFunction.invokeExact(type.getDouble(block, i)));
}
return hash;
}
catch (Throwable t) {
throw internalError(t);
}
}
private static PrestoException internalError(Throwable t)
{
Throwables.propagateIfInstanceOf(t, Error.class);
Throwables.propagateIfInstanceOf(t, PrestoException.class);
return new PrestoException(StandardErrorCode.GENERIC_INTERNAL_ERROR, t);
}
}