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.block.Block;
import com.facebook.presto.spi.function.IsNull;
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.type.StandardTypes;
import com.facebook.presto.spi.type.Type;
import com.google.common.base.Throwables;
import java.lang.invoke.MethodHandle;
import static com.facebook.presto.spi.StandardErrorCode.GENERIC_INTERNAL_ERROR;
import static com.facebook.presto.spi.function.OperatorType.IS_DISTINCT_FROM;
import static com.facebook.presto.spi.type.TypeUtils.readNativeValue;
import static com.google.common.base.Defaults.defaultValue;
@ScalarOperator(IS_DISTINCT_FROM)
public final class ArrayDistinctFromOperator
{
private ArrayDistinctFromOperator() {}
@TypeParameter("E")
@SqlType(StandardTypes.BOOLEAN)
public static boolean isDistinctFrom(
@OperatorDependency(operator = IS_DISTINCT_FROM, returnType = StandardTypes.BOOLEAN, argumentTypes = {"E", "E"}) MethodHandle function,
@TypeParameter("E") Type type,
@SqlType("array(E)") Block left,
@IsNull boolean leftNull,
@SqlType("array(E)") Block right,
@IsNull boolean rightNull)
{
if (leftNull != rightNull) {
return true;
}
if (leftNull) {
return false;
}
if (left.getPositionCount() != right.getPositionCount()) {
return true;
}
for (int i = 0; i < left.getPositionCount(); i++) {
Object leftValue = readNativeValue(type, left, i);
boolean leftValueNull = leftValue == null;
if (leftValueNull) {
leftValue = defaultValue(type.getJavaType());
}
Object rightValue = readNativeValue(type, right, i);
boolean rightValueNull = rightValue == null;
if (rightValueNull) {
rightValue = defaultValue(type.getJavaType());
}
try {
if ((boolean) function.invoke(
leftValue,
leftValueNull,
rightValue,
rightValueNull)) {
return true;
}
}
catch (Throwable t) {
Throwables.propagateIfInstanceOf(t, Error.class);
Throwables.propagateIfInstanceOf(t, PrestoException.class);
throw new PrestoException(GENERIC_INTERNAL_ERROR, t);
}
}
return false;
}
}