gortiz commented on code in PR #12227: URL: https://github.com/apache/pinot/pull/12227#discussion_r1507175271
########## pinot-core/src/main/java/org/apache/pinot/core/query/aggregation/function/NullableSingleInputAggregationFunction.java: ########## @@ -0,0 +1,263 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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 org.apache.pinot.core.query.aggregation.function; + +import java.util.NoSuchElementException; +import javax.annotation.Nullable; +import org.apache.pinot.common.request.context.ExpressionContext; +import org.apache.pinot.core.common.BlockValSet; +import org.roaringbitmap.IntIterator; +import org.roaringbitmap.RoaringBitmap; + + +public abstract class NullableSingleInputAggregationFunction<I, F extends Comparable> + extends BaseSingleInputAggregationFunction<I, F> { + protected final boolean _nullHandlingEnabled; + + public NullableSingleInputAggregationFunction(ExpressionContext expression, boolean nullHandlingEnabled) { + super(expression); + _nullHandlingEnabled = nullHandlingEnabled; + } + + /** + * A consumer that is being used to consume batch of indexes. + */ + @FunctionalInterface + public interface BatchConsumer { + /** + * Consumes a batch of indexes. + * @param fromInclusive the start index (inclusive) + * @param toExclusive the end index (exclusive) + */ + void consume(int fromInclusive, int toExclusive); + } + + /** + * A reducer that is being used to fold over consecutive indexes. + * @param <A> + */ + @FunctionalInterface + public interface Reducer<A> { + /** + * Applies the reducer to the range of indexes. + * @param acum the initial value of the accumulator + * @param fromInclusive the start index (inclusive) + * @param toExclusive the end index (exclusive) + * @return the next value of the accumulator (maybe the same as the input) + */ + A apply(A acum, int fromInclusive, int toExclusive); + } + + /** + * Iterates over the non-null ranges of the blockValSet and calls the consumer for each range. + * @param blockValSet the blockValSet to iterate over + * @param consumer the consumer to call for each non-null range + */ + public void forEachNotNull(int length, BlockValSet blockValSet, BatchConsumer consumer) { + if (!_nullHandlingEnabled) { + consumer.consume(0, length); + return; + } + + RoaringBitmap roaringBitmap = blockValSet.getNullBitmap(); + if (roaringBitmap == null) { + consumer.consume(0, length); + return; + } + + forEachNotNull(length, roaringBitmap.getIntIterator(), consumer); + } + + /** + * Iterates over the non-null ranges of the nullIndexIterator and calls the consumer for each range. + * @param nullIndexIterator an int iterator that returns values in ascending order whose min value is 0. + * Rows are considered null if and only if their index is emitted. + */ + public void forEachNotNull(int length, IntIterator nullIndexIterator, BatchConsumer consumer) { + int prev = 0; + while (nullIndexIterator.hasNext() && prev < length) { + int nextNull = Math.min(nullIndexIterator.next(), length); + if (nextNull > prev) { + consumer.consume(prev, nextNull); + } + prev = nextNull + 1; + } + if (prev < length) { + consumer.consume(prev, length); + } + } + + /** + * Folds over the non-null ranges of the blockValSet using the reducer. + * @param initialAcum the initial value of the accumulator + * @param <A> The type of the accumulator + */ + public <A> A foldNotNull(int length, @Nullable RoaringBitmap roaringBitmap, A initialAcum, Reducer<A> reducer) { + IntIterator intIterator = roaringBitmap == null ? null : roaringBitmap.getIntIterator(); + return foldNotNull(length, intIterator, initialAcum, reducer); + } + + /** + * Folds over the non-null ranges of the nullIndexIterator using the reducer. + * @param nullIndexIterator an int iterator that returns values in ascending order whose min value is 0. + * Rows are considered null if and only if their index is emitted. + * @param initialAcum the initial value of the accumulator + * @param <A> The type of the accumulator + */ + public <A> A foldNotNull(int length, @Nullable IntIterator nullIndexIterator, A initialAcum, Reducer<A> reducer) { + A acum = initialAcum; + if (!_nullHandlingEnabled || nullIndexIterator == null || !nullIndexIterator.hasNext()) { + return reducer.apply(initialAcum, 0, length); + } + + int prev = 0; + while (nullIndexIterator.hasNext() && prev < length) { + int nextNull = Math.min(nullIndexIterator.next(), length); + if (nextNull > prev) { + acum = reducer.apply(acum, prev, nextNull); + } + prev = nextNull + 1; + } + if (prev < length) { + acum = reducer.apply(acum, prev, length); + } + return acum; + } + + /** + * Returns an iterator that returns the union of the null bitmaps of valSet1 and valSet2. + */ + public IntIterator orNullIterator(BlockValSet valSet1, BlockValSet valSet2) { + if (!_nullHandlingEnabled) { + return EmptyIntIterator.INSTANCE; + } else { + RoaringBitmap nullBlock1 = valSet1.getNullBitmap(); + RoaringBitmap nullBlock2 = valSet2.getNullBitmap(); + if (nullBlock1 == null) { + return nullBlock2 == null ? EmptyIntIterator.INSTANCE : nullBlock2.getIntIterator(); + } else if (nullBlock2 == null) { + return nullBlock1.getIntIterator(); + } else { + return new MinIntIterator(nullBlock1.getIntIterator(), nullBlock2.getIntIterator()); + } + } + } + + public static class EmptyIntIterator implements IntIterator { + + public static final EmptyIntIterator INSTANCE = new EmptyIntIterator(); + + private EmptyIntIterator() { + } + + @Override + public IntIterator clone() { + return this; + } + + @Override + public boolean hasNext() { + return false; + } + + @Override + public int next() { + throw new NoSuchElementException(); + } + } + + /** + * An iterator that returns the minimum of the values returned by two other iterators. + * + * This means that at any point, the next value returned by this iterator is the minimum of the next values in the + * set defined by both sub-iterators. + */ + public static class MinIntIterator implements IntIterator { + private final IntIterator _it1; + private final IntIterator _it2; + private int _next1 = -1; + private int _next2 = -1; + + /** + * @param it1 it has to iterate in ascending order and the min value is 0 + * @param it2 it has to iterate in ascending order and the min value is 0 + */ + public MinIntIterator(IntIterator it1, IntIterator it2) { + _it1 = it1; + _it2 = it2; + } + + @Override + public IntIterator clone() { Review Comment: IntIterator.close is abstract in RoaringBitmaps, so we have to implement it. Anyway, I've just remove this code to introduce it in the percentille PR, which is the one that actually uses it -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@pinot.apache.org For additional commands, e-mail: commits-h...@pinot.apache.org
