io.trino.operator.scalar.ArrayExceptFunction Maven / Gradle / Ivy
/*
* 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 io.trino.operator.scalar;
import io.trino.spi.block.Block;
import io.trino.spi.block.BlockBuilder;
import io.trino.spi.function.Convention;
import io.trino.spi.function.Description;
import io.trino.spi.function.OperatorDependency;
import io.trino.spi.function.ScalarFunction;
import io.trino.spi.function.SqlType;
import io.trino.spi.function.TypeParameter;
import io.trino.spi.type.Type;
import io.trino.type.BlockTypeOperators.BlockPositionHashCode;
import io.trino.type.BlockTypeOperators.BlockPositionIsIdentical;
import static io.trino.spi.function.InvocationConvention.InvocationArgumentConvention.BLOCK_POSITION;
import static io.trino.spi.function.InvocationConvention.InvocationReturnConvention.FAIL_ON_NULL;
import static io.trino.spi.function.OperatorType.HASH_CODE;
import static io.trino.spi.function.OperatorType.IDENTICAL;
@ScalarFunction("array_except")
@Description("Returns an array of elements that are in the first array but not the second, without duplicates.")
public final class ArrayExceptFunction
{
private ArrayExceptFunction() {}
@TypeParameter("E")
@SqlType("array(E)")
public static Block except(
@TypeParameter("E") Type type,
@OperatorDependency(
operator = IDENTICAL,
argumentTypes = {"E", "E"},
convention = @Convention(arguments = {BLOCK_POSITION, BLOCK_POSITION}, result = FAIL_ON_NULL)) BlockPositionIsIdentical identicalOperator,
@OperatorDependency(
operator = HASH_CODE,
argumentTypes = "E",
convention = @Convention(arguments = BLOCK_POSITION, result = FAIL_ON_NULL)) BlockPositionHashCode elementHashCode,
@SqlType("array(E)") Block leftArray,
@SqlType("array(E)") Block rightArray)
{
int leftPositionCount = leftArray.getPositionCount();
int rightPositionCount = rightArray.getPositionCount();
if (leftPositionCount == 0 || rightPositionCount == 0) {
return leftArray;
}
BlockSet set = new BlockSet(type, identicalOperator, elementHashCode, rightPositionCount + leftPositionCount);
for (int i = 0; i < rightPositionCount; i++) {
set.add(rightArray, i);
}
BlockBuilder distinctElementBlockBuilder = type.createBlockBuilder(null, leftPositionCount);
for (int i = 0; i < leftPositionCount; i++) {
if (set.add(leftArray, i)) {
type.appendTo(leftArray, i, distinctElementBlockBuilder);
}
}
return distinctElementBlockBuilder.build();
}
}