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[flink] Support specifying what partitions to scan in Flink #5090
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139 changes: 139 additions & 0 deletions
139
...ink/paimon-flink-common/src/main/java/org/apache/paimon/flink/lookup/PartitionLoader.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| /* | ||
| * 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.flink.lookup; | ||
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| import org.apache.paimon.data.BinaryRow; | ||
| import org.apache.paimon.flink.FlinkConnectorOptions; | ||
| import org.apache.paimon.options.Options; | ||
| import org.apache.paimon.partition.PartitionPredicate; | ||
| import org.apache.paimon.predicate.Predicate; | ||
| import org.apache.paimon.predicate.PredicateBuilder; | ||
| import org.apache.paimon.table.FileStoreTable; | ||
| import org.apache.paimon.types.RowType; | ||
| import org.apache.paimon.utils.ParameterUtils; | ||
| import org.apache.paimon.utils.Preconditions; | ||
| import org.apache.paimon.utils.RowDataToObjectArrayConverter; | ||
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| import javax.annotation.Nullable; | ||
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| import java.io.Serializable; | ||
| import java.time.Duration; | ||
| import java.util.ArrayList; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
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| /** Specify partitions for lookup tables. */ | ||
| public abstract class PartitionLoader implements Serializable { | ||
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| private static final long serialVersionUID = 1L; | ||
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| private static final String MAX_PT = "max_pt()"; | ||
| private static final String MAX_TWO_PT = "max_two_pt()"; | ||
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| protected final FileStoreTable table; | ||
| private final RowDataToObjectArrayConverter partitionConverter; | ||
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| protected transient List<BinaryRow> partitions; | ||
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| protected PartitionLoader(FileStoreTable table) { | ||
| this.table = table; | ||
| this.partitionConverter = | ||
| new RowDataToObjectArrayConverter(table.rowType().project(table.partitionKeys())); | ||
| } | ||
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| public void open() { | ||
| this.partitions = new ArrayList<>(); | ||
| } | ||
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| public List<BinaryRow> partitions() { | ||
| return partitions; | ||
| } | ||
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| public void addPartitionKeysTo(List<String> joinKeys, List<String> projectFields) { | ||
| List<String> partitionKeys = table.partitionKeys(); | ||
| Preconditions.checkArgument( | ||
| joinKeys.stream().noneMatch(partitionKeys::contains), | ||
| "Currently, Paimon lookup table with partitions does not support partition keys in join keys."); | ||
| joinKeys.addAll(partitionKeys); | ||
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| partitionKeys.stream().filter(k -> !projectFields.contains(k)).forEach(projectFields::add); | ||
| } | ||
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| public Predicate createSpecificPartFilter() { | ||
| Predicate partFilter = null; | ||
| for (BinaryRow partition : partitions) { | ||
| if (partFilter == null) { | ||
| partFilter = createSinglePartFilter(partition); | ||
| } else { | ||
| partFilter = PredicateBuilder.or(partFilter, createSinglePartFilter(partition)); | ||
| } | ||
| } | ||
| return partFilter; | ||
| } | ||
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| private Predicate createSinglePartFilter(BinaryRow partition) { | ||
| RowType rowType = table.rowType(); | ||
| List<String> partitionKeys = table.partitionKeys(); | ||
| Object[] partitionSpec = partitionConverter.convert(partition); | ||
| Map<String, Object> partitionMap = new HashMap<>(partitionSpec.length); | ||
| for (int i = 0; i < partitionSpec.length; i++) { | ||
| partitionMap.put(partitionKeys.get(i), partitionSpec[i]); | ||
| } | ||
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| // create partition predicate base on rowType instead of partitionType | ||
| return PartitionPredicate.createPartitionPredicate(rowType, partitionMap); | ||
| } | ||
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| /** @return true if partition changed. */ | ||
| public abstract boolean checkRefresh(); | ||
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| @Nullable | ||
| public static PartitionLoader of(FileStoreTable table) { | ||
| Options options = Options.fromMap(table.options()); | ||
| String scanPartitions = options.get(FlinkConnectorOptions.SCAN_PARTITIONS); | ||
| if (scanPartitions == null) { | ||
| return null; | ||
| } | ||
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| Preconditions.checkArgument( | ||
| !table.partitionKeys().isEmpty(), | ||
| "{} is not supported for non-partitioned table.", | ||
| FlinkConnectorOptions.SCAN_PARTITIONS.key()); | ||
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| int maxPartitionNum = -1; | ||
| switch (scanPartitions.toLowerCase()) { | ||
| case MAX_PT: | ||
| maxPartitionNum = 1; | ||
| break; | ||
| case MAX_TWO_PT: | ||
| maxPartitionNum = 2; | ||
| break; | ||
| } | ||
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| if (maxPartitionNum == -1) { | ||
| return new StaticPartitionLoader( | ||
| table, ParameterUtils.getPartitions(scanPartitions.split(";"))); | ||
| } else { | ||
| Duration refresh = | ||
| options.get(FlinkConnectorOptions.LOOKUP_DYNAMIC_PARTITION_REFRESH_INTERVAL); | ||
| return new DynamicPartitionLoader(table, refresh, maxPartitionNum); | ||
| } | ||
| } | ||
| } | ||
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Why use FileStoreTable instead of Table?
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We need specific methods like
schema()in its subclass.