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API: add StructTransform base class for PartitionKey and SortKey. add…
… SortOrderComparators (apache#7798)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,56 @@ | ||
| /* | ||
| * 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.iceberg; | ||
|
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| import java.util.List; | ||
| import java.util.stream.Collectors; | ||
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| /** | ||
| * A struct of flattened sort field values. | ||
| * | ||
| * <p>Instances of this class can produce sort values from a row passed to {@link | ||
| * #wrap(StructLike)}. | ||
| */ | ||
| public class SortKey extends StructTransform { | ||
| private final Schema schema; | ||
| private final SortOrder sortOrder; | ||
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| public SortKey(Schema schema, SortOrder sortOrder) { | ||
| super(schema, fieldTransform(sortOrder)); | ||
| this.schema = schema; | ||
| this.sortOrder = sortOrder; | ||
| } | ||
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| private SortKey(SortKey toCopy) { | ||
| // only need deep copy inside StructTransform | ||
| super(toCopy); | ||
| this.schema = toCopy.schema; | ||
| this.sortOrder = toCopy.sortOrder; | ||
| } | ||
|
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| public SortKey copy() { | ||
| return new SortKey(this); | ||
| } | ||
|
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| private static List<FieldTransform> fieldTransform(SortOrder sortOrder) { | ||
| return sortOrder.fields().stream() | ||
| .map(sortField -> new FieldTransform(sortField.sourceId(), sortField.transform())) | ||
| .collect(Collectors.toList()); | ||
| } | ||
| } |
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api/src/main/java/org/apache/iceberg/SortOrderComparators.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,105 @@ | ||
| /* | ||
| * 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.iceberg; | ||
|
|
||
| import java.lang.reflect.Array; | ||
| import java.util.Comparator; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
| import org.apache.iceberg.types.Comparators; | ||
| import org.apache.iceberg.types.Type; | ||
| import org.apache.iceberg.types.Types; | ||
|
|
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| public class SortOrderComparators { | ||
| private SortOrderComparators() {} | ||
|
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| /** Compare structs with the specified sort order projection */ | ||
| public static Comparator<StructLike> forSchema(Schema schema, SortOrder sortOrder) { | ||
| Preconditions.checkArgument(sortOrder.isSorted(), "Invalid sort order: unsorted"); | ||
| SortOrder.checkCompatibility(sortOrder, schema); | ||
| return new SortOrderComparator(schema, sortOrder); | ||
| } | ||
|
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| /** Util method to chain sort direction and null order to the original comparator. */ | ||
| private static Comparator<Object> sortFieldComparator( | ||
| Comparator<Object> original, SortField sortField) { | ||
| Comparator<Object> comparator = original; | ||
| if (sortField == null) { | ||
| return Comparators.nullsFirst().thenComparing(comparator); | ||
| } | ||
|
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| if (sortField.direction() == SortDirection.DESC) { | ||
| comparator = comparator.reversed(); | ||
| } | ||
|
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| if (sortField.nullOrder() == NullOrder.NULLS_FIRST) { | ||
| comparator = Comparators.nullsFirst().thenComparing(comparator); | ||
| } else if (sortField.nullOrder() == NullOrder.NULLS_LAST) { | ||
| comparator = Comparators.nullsLast().thenComparing(comparator); | ||
| } | ||
|
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| return comparator; | ||
| } | ||
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| private static class SortOrderComparator implements Comparator<StructLike> { | ||
| private final SortKey leftKey; | ||
| private final SortKey rightKey; | ||
| private final int size; | ||
| private final Comparator<Object>[] comparators; | ||
| private final Type[] transformResultTypes; | ||
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| private SortOrderComparator(Schema schema, SortOrder sortOrder) { | ||
| this.leftKey = new SortKey(schema, sortOrder); | ||
| this.rightKey = new SortKey(schema, sortOrder); | ||
| this.size = sortOrder.fields().size(); | ||
| this.comparators = (Comparator<Object>[]) Array.newInstance(Comparator.class, size); | ||
| this.transformResultTypes = (Type[]) Array.newInstance(Type.class, size); | ||
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| for (int i = 0; i < size; ++i) { | ||
| SortField sortField = sortOrder.fields().get(i); | ||
| Types.NestedField field = schema.findField(sortField.sourceId()); | ||
| Type transformResultType = sortField.transform().getResultType(field.type()); | ||
| Preconditions.checkArgument( | ||
| transformResultType.isPrimitiveType(), "Invalid transform result type: non-primitive"); | ||
| transformResultTypes[i] = transformResultType; | ||
| Comparator<Object> comparator = Comparators.forType(transformResultType.asPrimitiveType()); | ||
| comparators[i] = sortFieldComparator(comparator, sortField); | ||
| } | ||
| } | ||
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| @Override | ||
| public int compare(StructLike left, StructLike right) { | ||
| if (left == right) { | ||
| return 0; | ||
| } | ||
|
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| leftKey.wrap(left); | ||
| rightKey.wrap(right); | ||
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| for (int i = 0; i < size; i += 1) { | ||
| Class<?> valueClass = transformResultTypes[i].typeId().javaClass(); | ||
| int cmp = comparators[i].compare(leftKey.get(i, valueClass), rightKey.get(i, valueClass)); | ||
| if (cmp != 0) { | ||
| return cmp; | ||
| } | ||
| } | ||
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| return 0; | ||
| } | ||
| } | ||
| } |
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