/*
* 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.spi.PrestoException;
import com.facebook.presto.spi.block.Block;
import com.facebook.presto.spi.block.BlockBuilder;
import com.facebook.presto.spi.block.BlockBuilderStatus;
import com.facebook.presto.spi.function.Description;
import com.facebook.presto.spi.function.OperatorDependency;
import com.facebook.presto.spi.function.ScalarFunction;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.function.TypeParameter;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.spi.type.Type;
import com.google.common.base.Throwables;
import java.lang.invoke.MethodHandle;
import java.util.ArrayList;
import java.util.List;
import static com.facebook.presto.spi.StandardErrorCode.GENERIC_INTERNAL_ERROR;
import static com.facebook.presto.spi.function.OperatorType.EQUAL;
import static com.facebook.presto.spi.type.TypeUtils.readNativeValue;
@ScalarFunction("array_remove")
@Description("Remove specified values from the given array")
public final class ArrayRemoveFunction
{
private ArrayRemoveFunction() {}
@TypeParameter("E")
@SqlType("array(E)")
public static Block remove(
@OperatorDependency(operator = EQUAL, returnType = StandardTypes.BOOLEAN, argumentTypes = {"E", "E"}) MethodHandle equalsFunction,
@TypeParameter("E") Type type,
@SqlType("array(E)") Block array,
@SqlType("E") long value)
{
return remove(equalsFunction, type, array, (Object) value);
}
@TypeParameter("E")
@SqlType("array(E)")
public static Block remove(
@OperatorDependency(operator = EQUAL, returnType = StandardTypes.BOOLEAN, argumentTypes = {"E", "E"}) MethodHandle equalsFunction,
@TypeParameter("E") Type type,
@SqlType("array(E)") Block array,
@SqlType("E") double value)
{
return remove(equalsFunction, type, array, (Object) value);
}
@TypeParameter("E")
@SqlType("array(E)")
public static Block remove(
@OperatorDependency(operator = EQUAL, returnType = StandardTypes.BOOLEAN, argumentTypes = {"E", "E"}) MethodHandle equalsFunction,
@TypeParameter("E") Type type,
@SqlType("array(E)") Block array,
@SqlType("E") boolean value)
{
return remove(equalsFunction, type, array, (Object) value);
}
@TypeParameter("E")
@SqlType("array(E)")
public static Block remove(
@OperatorDependency(operator = EQUAL, returnType = StandardTypes.BOOLEAN, argumentTypes = {"E", "E"}) MethodHandle equalsFunction,
@TypeParameter("E") Type type,
@SqlType("array(E)") Block array,
@SqlType("E") Object value)
{
int sizeAfterRemove = 0;
List<Integer> positions = new ArrayList<>();
for (int i = 0; i < array.getPositionCount(); i++) {
Object element = readNativeValue(type, array, i);
try {
if (element == null || !(boolean) equalsFunction.invoke(element, value)) {
positions.add(i);
sizeAfterRemove += array.getRegionSizeInBytes(i, 1);
}
}
catch (Throwable t) {
Throwables.propagateIfInstanceOf(t, Error.class);
Throwables.propagateIfInstanceOf(t, PrestoException.class);
throw new PrestoException(GENERIC_INTERNAL_ERROR, t);
}
}
if (array.getPositionCount() == positions.size()) {
return array;
}
int entrySize = 0;
if (!positions.isEmpty()) {
entrySize = (int) Math.ceil(sizeAfterRemove / (double) positions.size());
}
BlockBuilder blockBuilder = type.createBlockBuilder(new BlockBuilderStatus(), positions.size(), entrySize);
for (int position : positions) {
type.appendTo(array, position, blockBuilder);
}
return blockBuilder.build();
}
}