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Parquet: Support name mappings to recover field IDs (apache#830)
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110 changes: 110 additions & 0 deletions
110
parquet/src/main/java/org/apache/iceberg/parquet/ApplyNameMapping.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,110 @@ | ||
| /* | ||
| * 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.iceberg.parquet; | ||
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| import java.util.List; | ||
| import java.util.Objects; | ||
| import java.util.stream.Collectors; | ||
| import org.apache.iceberg.mapping.MappedField; | ||
| import org.apache.iceberg.mapping.NameMapping; | ||
| import org.apache.parquet.Preconditions; | ||
| import org.apache.parquet.schema.GroupType; | ||
| import org.apache.parquet.schema.MessageType; | ||
| import org.apache.parquet.schema.PrimitiveType; | ||
| import org.apache.parquet.schema.Type; | ||
| import org.apache.parquet.schema.Types; | ||
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| class ApplyNameMapping extends ParquetTypeVisitor<Type> { | ||
| private final NameMapping nameMapping; | ||
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| ApplyNameMapping(NameMapping nameMapping) { | ||
| this.nameMapping = nameMapping; | ||
| } | ||
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| @Override | ||
| public Type message(MessageType message, List<Type> fields) { | ||
| Types.MessageTypeBuilder builder = org.apache.parquet.schema.Types.buildMessage(); | ||
| fields.stream().filter(Objects::nonNull).forEach(builder::addField); | ||
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| return builder.named(message.getName()); | ||
| } | ||
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| @Override | ||
| public Type struct(GroupType struct, List<Type> types) { | ||
| MappedField field = nameMapping.find(currentPath()); | ||
| List<Type> actualTypes = types.stream().filter(Objects::nonNull).collect(Collectors.toList()); | ||
| Type structType = struct.withNewFields(actualTypes); | ||
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| return field == null ? structType : structType.withId(field.id()); | ||
| } | ||
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| @Override | ||
| public Type list(GroupType list, Type elementType) { | ||
| Preconditions.checkArgument(elementType != null, | ||
| "List type must have element field"); | ||
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| MappedField field = nameMapping.find(currentPath()); | ||
| Type listType = org.apache.parquet.schema.Types.list(list.getRepetition()) | ||
| .element(elementType) | ||
| .named(list.getName()); | ||
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| return field == null ? listType : listType.withId(field.id()); | ||
| } | ||
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| @Override | ||
| public Type map(GroupType map, Type keyType, Type valueType) { | ||
| Preconditions.checkArgument(keyType != null && valueType != null, | ||
| "Map type must have both key field and value field"); | ||
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| MappedField field = nameMapping.find(currentPath()); | ||
| Type mapType = org.apache.parquet.schema.Types.map(map.getRepetition()) | ||
| .key(keyType) | ||
| .value(valueType) | ||
| .named(map.getName()); | ||
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| return field == null ? mapType : mapType.withId(field.id()); | ||
| } | ||
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| @Override | ||
| public Type primitive(PrimitiveType primitive) { | ||
| MappedField field = nameMapping.find(currentPath()); | ||
| return field == null ? primitive : primitive.withId(field.id()); | ||
| } | ||
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| @Override | ||
| public void beforeRepeatedElement(Type element) { | ||
| // do not add the repeated element's name | ||
| } | ||
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| @Override | ||
| public void afterRepeatedElement(Type element) { | ||
| // do not remove the repeated element's name | ||
| } | ||
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| @Override | ||
| public void beforeRepeatedKeyValue(Type keyValue) { | ||
| // do not add the repeated element's name | ||
| } | ||
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| @Override | ||
| public void afterRepeatedKeyValue(Type keyValue) { | ||
| // do not remove the repeated element's name | ||
| } | ||
| } |
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