/*
* 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.block.Block;
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.SqlNullable;
import com.facebook.presto.spi.function.SqlType;
import com.facebook.presto.spi.function.TypeParameter;
import com.facebook.presto.spi.type.AbstractType;
import com.facebook.presto.spi.type.StandardTypes;
import com.facebook.presto.spi.type.Type;
import it.unimi.dsi.fastutil.ints.AbstractIntComparator;
import it.unimi.dsi.fastutil.ints.IntArrays;
import it.unimi.dsi.fastutil.ints.IntComparator;
import java.lang.invoke.MethodHandle;
import java.util.Arrays;
import static com.facebook.presto.spi.function.OperatorType.LESS_THAN;
import static com.facebook.presto.spi.type.BigintType.BIGINT;
import static com.facebook.presto.spi.type.IntegerType.INTEGER;
@ScalarFunction("arrays_overlap")
@Description("Returns true if arrays have common elements")
public final class ArraysOverlapFunction
{
private int[] leftPositions;
private int[] rightPositions;
private long[] leftLongArray;
private long[] rightLongArray;
@TypeParameter("E")
public ArraysOverlapFunction(@TypeParameter("E") Type elementType) {}
public ArraysOverlapFunction() {}
private static IntComparator intBlockCompare(Type type, Block block)
{
return new AbstractIntComparator()
{
@Override
public int compare(int left, int right)
{
if (block.isNull(left) && block.isNull(right)) {
return 0;
}
if (block.isNull(left)) {
return 1;
}
if (block.isNull(right)) {
return -1;
}
return type.compareTo(block, left, block, right);
}
};
}
@SqlNullable
@SqlType(StandardTypes.BOOLEAN)
public Boolean arraysOverlapInt(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"integer", "integer"}) MethodHandle lessThanFunction,
@SqlType("array(integer)") Block leftArray,
@SqlType("array(integer)") Block rightArray)
{
return genericArraysOverlap(leftArray, rightArray, INTEGER);
}
@SqlNullable
@SqlType(StandardTypes.BOOLEAN)
public Boolean arraysOverlapBigInt(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"bigint", "bigint"}) MethodHandle lessThanFunction,
@SqlType("array(bigint)") Block leftArray,
@SqlType("array(bigint)") Block rightArray)
{
return genericArraysOverlap(leftArray, rightArray, BIGINT);
}
@SqlNullable
@TypeParameter("E")
@SqlType(StandardTypes.BOOLEAN)
public Boolean arraysOverlap(
@OperatorDependency(operator = LESS_THAN, returnType = StandardTypes.BOOLEAN, argumentTypes = {"E", "E"}) MethodHandle lessThanFunction,
@TypeParameter("E") Type type,
@SqlType("array(E)") Block leftArray,
@SqlType("array(E)") Block rightArray)
{
int leftPositionCount = leftArray.getPositionCount();
int rightPositionCount = rightArray.getPositionCount();
if (leftPositionCount == 0 || rightPositionCount == 0) {
return false;
}
if (leftPositions == null || leftPositions.length < leftPositionCount) {
leftPositions = new int[leftPositionCount * 2];
}
if (rightPositions == null || rightPositions.length < rightPositionCount) {
rightPositions = new int[rightPositionCount * 2];
}
for (int i = 0; i < leftPositionCount; i++) {
leftPositions[i] = i;
}
for (int i = 0; i < rightPositionCount; i++) {
rightPositions[i] = i;
}
IntArrays.quickSort(leftPositions, 0, leftPositionCount, intBlockCompare(type, leftArray));
IntArrays.quickSort(rightPositions, 0, rightPositionCount, intBlockCompare(type, rightArray));
int leftCurrentPosition = 0;
int rightCurrentPosition = 0;
while (leftCurrentPosition < leftPositionCount && rightCurrentPosition < rightPositionCount) {
if (leftArray.isNull(leftPositions[leftCurrentPosition]) || rightArray.isNull(rightPositions[rightCurrentPosition])) {
// Nulls are in the end of the array. Non-null elements do not overlap.
return null;
}
int compareValue = type.compareTo(leftArray, leftPositions[leftCurrentPosition], rightArray, rightPositions[rightCurrentPosition]);
if (compareValue > 0) {
rightCurrentPosition++;
}
else if (compareValue < 0) {
leftCurrentPosition++;
}
else {
return true;
}
}
return leftArray.isNull(leftPositions[leftPositionCount - 1]) || rightArray.isNull(rightPositions[rightPositionCount - 1]) ? null : false;
}
public Boolean genericArraysOverlap(Block leftArray, Block rightArray, AbstractType type)
{
int leftSize = leftArray.getPositionCount();
int rightSize = rightArray.getPositionCount();
if (leftSize == 0 || rightSize == 0) {
return false;
}
if (leftLongArray == null || leftLongArray.length < leftSize) {
leftLongArray = new long[leftSize * 2];
}
if (rightLongArray == null || rightLongArray.length < rightSize) {
rightLongArray = new long[rightSize * 2];
}
int leftNonNullSize = sortAbstractLongArray(leftArray, leftLongArray, type);
int rightNonNullSize = sortAbstractLongArray(rightArray, rightLongArray, type);
int leftPosition = 0;
int rightPosition = 0;
while (leftPosition < leftNonNullSize && rightPosition < rightNonNullSize) {
if (leftLongArray[leftPosition] < rightLongArray[rightPosition]) {
leftPosition++;
}
else if (rightLongArray[rightPosition] < leftLongArray[leftPosition]) {
rightPosition++;
}
else {
return true;
}
}
return (leftNonNullSize < leftSize) || (rightNonNullSize < rightSize) ? null : false;
}
// Assumes buffer is long enough, returns count of non-null elements.
private static int sortAbstractLongArray(Block array, long[] buffer, AbstractType type)
{
int arraySize = array.getPositionCount();
int nonNullSize = 0;
for (int i = 0; i < arraySize; i++) {
if (!array.isNull(i)) {
buffer[nonNullSize++] = type.getLong(array, i);
}
}
for (int i = 1; i < nonNullSize; i++) {
if (buffer[i - 1] > buffer[i]) {
Arrays.sort(buffer, 0, nonNullSize);
break;
}
}
return nonNullSize;
}
}