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[core] Introduce nested-update agg to support aggregate nested table (#…
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109 changes: 109 additions & 0 deletions
109
...ore/src/main/java/org/apache/paimon/mergetree/compact/aggregate/FieldNestedUpdateAgg.java
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| /* | ||
| * 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.paimon.mergetree.compact.aggregate; | ||
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| import org.apache.paimon.data.GenericArray; | ||
| import org.apache.paimon.data.InternalArray; | ||
| import org.apache.paimon.data.InternalRow; | ||
| import org.apache.paimon.types.ArrayType; | ||
| import org.apache.paimon.types.DataField; | ||
| import org.apache.paimon.types.RowType; | ||
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| import javax.annotation.Nullable; | ||
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| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.function.BiFunction; | ||
| import java.util.stream.Collectors; | ||
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| import static org.apache.paimon.utils.Preconditions.checkArgument; | ||
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| /** | ||
| * Used to update a field which representing a nested table. The data type of nested table field is | ||
| * {@code ARRAY<ROW>}. | ||
| */ | ||
| public class FieldNestedUpdateAgg extends FieldAggregator { | ||
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| public static final String NAME = "nested-update"; | ||
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| private final BiFunction<InternalArray, Integer, InternalRow> rowGetter; | ||
| private final List<InternalRow.FieldGetter> keyGetters; | ||
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| public FieldNestedUpdateAgg(ArrayType dataType, List<String> nestedKeys) { | ||
| super(dataType); | ||
| RowType rowType = (RowType) dataType.getElementType(); | ||
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| InternalArray.ElementGetter objectGetter = InternalArray.createElementGetter(rowType); | ||
| this.rowGetter = (array, pos) -> (InternalRow) objectGetter.getElementOrNull(array, pos); | ||
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| this.keyGetters = new ArrayList<>(nestedKeys.size()); | ||
| List<DataField> dataFields = rowType.getFields(); | ||
| for (int i = 0; i < dataFields.size(); i++) { | ||
| DataField dataField = dataFields.get(i); | ||
| if (nestedKeys.contains(dataField.name())) { | ||
| keyGetters.add(InternalRow.createFieldGetter(dataField.type(), i)); | ||
| } | ||
| } | ||
| checkArgument(keyGetters.size() == nestedKeys.size(), "You have set wrong nested keys."); | ||
| } | ||
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| @Override | ||
| String name() { | ||
| return NAME; | ||
| } | ||
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| @Override | ||
| public Object agg(Object accumulator, Object inputField) { | ||
| if (accumulator == null || inputField == null) { | ||
| return accumulator == null ? inputField : accumulator; | ||
| } | ||
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| Map<List<Object>, InternalRow> unnestedAcc = unnest(accumulator); | ||
| InternalArray inputs = (InternalArray) inputField; | ||
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| for (int i = 0; i < inputs.size(); i++) { | ||
| InternalRow row = rowGetter.apply(inputs, i); | ||
| List<Object> keys = getKeys(row); | ||
| // update by nested keys | ||
| unnestedAcc.put(keys, row); | ||
| } | ||
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| return new GenericArray(unnestedAcc.values().toArray()); | ||
| } | ||
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| private Map<List<Object>, InternalRow> unnest(@Nullable Object accumulator) { | ||
| Map<List<Object>, InternalRow> unnested = new HashMap<>(); | ||
| if (accumulator != null) { | ||
| InternalArray array = (InternalArray) accumulator; | ||
| for (int i = 0; i < array.size(); i++) { | ||
| InternalRow row = rowGetter.apply(array, i); | ||
| List<Object> keys = getKeys(row); | ||
| unnested.put(keys, row); | ||
| } | ||
| } | ||
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| return unnested; | ||
| } | ||
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| private List<Object> getKeys(InternalRow row) { | ||
| return keyGetters.stream().map(g -> g.getFieldOrNull(row)).collect(Collectors.toList()); | ||
| } | ||
| } |
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