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[EXPB-2111] MergeJoin removes null values in front of non null values
Signed-off-by: Corvin Kuebler <[email protected]>
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87
linq4j/src/main/java/org/apache/calcite/linq4j/MergeJoinNotNullEnumerable.java
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| @@ -0,0 +1,87 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.calcite.linq4j; | ||
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| import org.apache.calcite.linq4j.function.Function1; | ||
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| import java.util.Arrays; | ||
| import java.util.List; | ||
| import java.util.Objects; | ||
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| public class MergeJoinNotNullEnumerable<T, K> extends AbstractEnumerable<T> { | ||
| private final Enumerable<T> enumerable; | ||
| private final Function1<T, K> keySelector; | ||
| private boolean skipNulls = true; | ||
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| private MergeJoinNotNullEnumerable(Enumerable<T> enumerable, Function1<T, K> keySelector) { | ||
| this.enumerable = enumerable; | ||
| this.keySelector = keySelector; | ||
| } | ||
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| public static <T, K> MergeJoinNotNullEnumerable<T, K> create(Enumerable<T> enumerable, Function1<T, K> keySelector) { | ||
| return new MergeJoinNotNullEnumerable<>(enumerable, keySelector); | ||
| } | ||
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| @Override | ||
| public Enumerator<T> enumerator() { | ||
| Enumerator<T> enumerator = enumerable.enumerator(); | ||
| return new Enumerator<T>() { | ||
| @Override | ||
| public T current() { | ||
| return enumerator.current(); | ||
| } | ||
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| @Override | ||
| public boolean moveNext() { | ||
| boolean next = enumerator.moveNext(); | ||
| if (!skipNulls) { | ||
| return next; | ||
| } | ||
| while (next) { | ||
| K key = keySelector.apply(enumerator.current()); | ||
| if (key != null) { | ||
| if (key instanceof Object[]) { | ||
| if(Arrays.stream((Object[]) key).noneMatch(Objects::isNull)) { | ||
| break; | ||
| } | ||
| } else if (key instanceof List) { | ||
| if (((List<?>) key).stream().noneMatch(Objects::isNull)) { | ||
| break; | ||
| } | ||
| } else { | ||
| break; | ||
| } | ||
| } | ||
| next = enumerator.moveNext(); | ||
| } | ||
| skipNulls = false; | ||
| return next; | ||
| } | ||
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| @Override | ||
| public void reset() { | ||
| enumerator.reset(); | ||
| } | ||
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| @Override | ||
| public void close() { | ||
| enumerator.close(); | ||
| } | ||
| }; | ||
| } | ||
| } |