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Core: Refactor internal Avro reader to resolve schemas directly (apac…
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211 changes: 211 additions & 0 deletions
211
core/src/main/java/org/apache/iceberg/avro/AvroWithPartnerVisitor.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. | ||
| */ | ||
| package org.apache.iceberg.avro; | ||
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|
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| import java.util.Deque; | ||
| import java.util.List; | ||
| import org.apache.avro.Schema; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
| import org.apache.iceberg.relocated.com.google.common.collect.Lists; | ||
| import org.apache.iceberg.types.Type; | ||
| import org.apache.iceberg.types.Types; | ||
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| public class AvroWithPartnerVisitor<P, R> { | ||
| public interface PartnerAccessors<P> { | ||
| P fieldPartner(P partnerStruct, Integer fieldId, String name); | ||
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| P mapKeyPartner(P partnerMap); | ||
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| P mapValuePartner(P partnerMap); | ||
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| P listElementPartner(P partnerList); | ||
| } | ||
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| static class FieldIDAccessors implements AvroWithPartnerVisitor.PartnerAccessors<Type> { | ||
| private static final FieldIDAccessors INSTANCE = new FieldIDAccessors(); | ||
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| public static FieldIDAccessors get() { | ||
| return INSTANCE; | ||
| } | ||
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| @Override | ||
| public Type fieldPartner(Type partner, Integer fieldId, String name) { | ||
| Types.NestedField field = partner.asStructType().field(fieldId); | ||
| return field != null ? field.type() : null; | ||
| } | ||
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| @Override | ||
| public Type mapKeyPartner(Type partner) { | ||
| return partner.asMapType().keyType(); | ||
| } | ||
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| @Override | ||
| public Type mapValuePartner(Type partner) { | ||
| return partner.asMapType().valueType(); | ||
| } | ||
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| @Override | ||
| public Type listElementPartner(Type partner) { | ||
| return partner.asListType().elementType(); | ||
| } | ||
| } | ||
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| /** Used to fail on recursive types. */ | ||
| private Deque<String> recordLevels = Lists.newLinkedList(); | ||
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| public R record(P partner, Schema record, List<R> fieldResults) { | ||
| return null; | ||
| } | ||
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| public R union(P partner, Schema union, List<R> optionResults) { | ||
| return null; | ||
| } | ||
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| public R array(P partner, Schema array, R elementResult) { | ||
| return null; | ||
| } | ||
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| public R arrayMap(P partner, Schema map, R keyResult, R valueResult) { | ||
| return null; | ||
| } | ||
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| public R map(P partner, Schema map, R valueResult) { | ||
| return null; | ||
| } | ||
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| public R primitive(P partner, Schema primitive) { | ||
| return null; | ||
| } | ||
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| public static <P, R> R visit( | ||
| P partner, | ||
| Schema schema, | ||
| AvroWithPartnerVisitor<P, R> visitor, | ||
| PartnerAccessors<P> accessors) { | ||
| switch (schema.getType()) { | ||
| case RECORD: | ||
| return visitRecord(partner, schema, visitor, accessors); | ||
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| case UNION: | ||
| return visitUnion(partner, schema, visitor, accessors); | ||
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| case ARRAY: | ||
| return visitArray(partner, schema, visitor, accessors); | ||
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| case MAP: | ||
| return visitor.map( | ||
| partner, | ||
| schema, | ||
| visit( | ||
| partner != null ? accessors.mapValuePartner(partner) : null, | ||
| schema.getValueType(), | ||
| visitor, | ||
| accessors)); | ||
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| default: | ||
| return visitor.primitive(partner, schema); | ||
| } | ||
| } | ||
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| private static <P, R> R visitRecord( | ||
| P partnerStruct, | ||
| Schema record, | ||
| AvroWithPartnerVisitor<P, R> visitor, | ||
| PartnerAccessors<P> accessors) { | ||
| // check to make sure this hasn't been visited before | ||
| String recordName = record.getFullName(); | ||
| Preconditions.checkState( | ||
| !visitor.recordLevels.contains(recordName), | ||
| "Cannot process recursive Avro record %s", | ||
| recordName); | ||
| visitor.recordLevels.push(recordName); | ||
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| List<Schema.Field> fields = record.getFields(); | ||
| List<R> results = Lists.newArrayListWithExpectedSize(fields.size()); | ||
| for (int pos = 0; pos < fields.size(); pos += 1) { | ||
| Schema.Field field = fields.get(pos); | ||
| Integer fieldId = AvroSchemaUtil.fieldId(field); | ||
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| P fieldPartner = | ||
| partnerStruct != null && fieldId != null | ||
| ? accessors.fieldPartner(partnerStruct, fieldId, field.name()) | ||
| : null; | ||
| results.add(visit(fieldPartner, field.schema(), visitor, accessors)); | ||
| } | ||
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| visitor.recordLevels.pop(); | ||
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| return visitor.record(partnerStruct, record, results); | ||
| } | ||
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| private static <P, R> R visitUnion( | ||
| P partner, | ||
| Schema union, | ||
| AvroWithPartnerVisitor<P, R> visitor, | ||
| PartnerAccessors<P> accessors) { | ||
| Preconditions.checkArgument( | ||
| AvroSchemaUtil.isOptionSchema(union), "Cannot visit non-option union: %s", union); | ||
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| List<Schema> types = union.getTypes(); | ||
| List<R> options = Lists.newArrayListWithExpectedSize(types.size()); | ||
| for (Schema branch : types) { | ||
| options.add(visit(partner, branch, visitor, accessors)); | ||
| } | ||
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| return visitor.union(partner, union, options); | ||
| } | ||
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| private static <P, R> R visitArray( | ||
| P partnerArray, | ||
| Schema array, | ||
| AvroWithPartnerVisitor<P, R> visitor, | ||
| PartnerAccessors<P> accessors) { | ||
| if (array.getLogicalType() instanceof LogicalMap) { | ||
| Preconditions.checkState( | ||
| AvroSchemaUtil.isKeyValueSchema(array.getElementType()), | ||
| "Cannot visit invalid logical map type: %s", | ||
| array); | ||
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| List<Schema.Field> keyValueFields = array.getElementType().getFields(); | ||
| return visitor.arrayMap( | ||
| partnerArray, | ||
| array, | ||
| visit( | ||
| partnerArray != null ? accessors.mapKeyPartner(partnerArray) : null, | ||
| keyValueFields.get(0).schema(), | ||
| visitor, | ||
| accessors), | ||
| visit( | ||
| partnerArray != null ? accessors.mapValuePartner(partnerArray) : null, | ||
| keyValueFields.get(1).schema(), | ||
| visitor, | ||
| accessors)); | ||
|
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| } else { | ||
| return visitor.array( | ||
| partnerArray, | ||
| array, | ||
| visit( | ||
| partnerArray != null ? accessors.listElementPartner(partnerArray) : null, | ||
| array.getElementType(), | ||
| visitor, | ||
| accessors)); | ||
| } | ||
| } | ||
| } |
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