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Core: Add Avro readers for Iceberg's internal object model.
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core/src/main/java/org/apache/iceberg/avro/InternalReader.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; | ||
|
|
||
| import java.io.IOException; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.function.Supplier; | ||
| import org.apache.avro.LogicalType; | ||
| import org.apache.avro.LogicalTypes; | ||
| import org.apache.avro.Schema; | ||
| import org.apache.avro.io.DatumReader; | ||
| import org.apache.avro.io.Decoder; | ||
| import org.apache.iceberg.StructLike; | ||
| import org.apache.iceberg.relocated.com.google.common.collect.ImmutableMap; | ||
| import org.apache.iceberg.relocated.com.google.common.collect.Maps; | ||
| import org.apache.iceberg.types.Type; | ||
| import org.apache.iceberg.types.Types; | ||
| import org.apache.iceberg.util.Pair; | ||
|
|
||
| /** | ||
| * A reader that produces Iceberg's internal in-memory object model. | ||
| * | ||
| * <p>Iceberg's internal in-memory object model produces the types defined in {@link | ||
| * Type.TypeID#javaClass()}. | ||
| * | ||
| * @param <T> Java type returned by the reader | ||
| */ | ||
| public class InternalReader<T> implements DatumReader<T>, SupportsRowPosition { | ||
|
|
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| private final Types.StructType expectedType; | ||
| private final Map<Integer, Class<? extends StructLike>> typeMap = Maps.newHashMap(); | ||
| private final Map<Integer, Object> idToConstant = ImmutableMap.of(); | ||
| private Schema fileSchema = null; | ||
| private ValueReader<T> reader = null; | ||
|
|
||
| public static <D> InternalReader<D> create(org.apache.iceberg.Schema schema) { | ||
| return new InternalReader<>(schema); | ||
| } | ||
|
|
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| InternalReader(org.apache.iceberg.Schema readSchema) { | ||
| this.expectedType = readSchema.asStruct(); | ||
| } | ||
|
|
||
| @SuppressWarnings("unchecked") | ||
| private void initReader() { | ||
| this.reader = | ||
| (ValueReader<T>) | ||
| AvroWithPartnerVisitor.visit( | ||
| Pair.of(-1, expectedType), | ||
| fileSchema, | ||
| new ResolvingReadBuilder(), | ||
| AccessByID.instance()); | ||
| } | ||
|
|
||
| @Override | ||
| public void setSchema(Schema schema) { | ||
| this.fileSchema = schema; | ||
| initReader(); | ||
| } | ||
|
|
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| public InternalReader<T> setRootType(Class<? extends StructLike> rootClass) { | ||
| typeMap.put(-1, rootClass); | ||
| return this; | ||
| } | ||
|
|
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| public InternalReader<T> setCustomType(int fieldId, Class<? extends StructLike> structClass) { | ||
| typeMap.put(fieldId, structClass); | ||
| return this; | ||
| } | ||
|
|
||
| @Override | ||
| public void setRowPositionSupplier(Supplier<Long> posSupplier) { | ||
| if (reader instanceof SupportsRowPosition) { | ||
| ((SupportsRowPosition) reader).setRowPositionSupplier(posSupplier); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public T read(T reuse, Decoder decoder) throws IOException { | ||
| return reader.read(decoder, reuse); | ||
| } | ||
|
|
||
| private class ResolvingReadBuilder | ||
| extends AvroWithPartnerVisitor<Pair<Integer, Type>, ValueReader<?>> { | ||
| @Override | ||
| public ValueReader<?> record( | ||
| Pair<Integer, Type> partner, Schema record, List<ValueReader<?>> fieldResults) { | ||
| if (partner == null) { | ||
| return ValueReaders.skipStruct(fieldResults); | ||
| } | ||
|
|
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| Types.StructType expected = partner.second().asStructType(); | ||
| List<Pair<Integer, ValueReader<?>>> readPlan = | ||
| ValueReaders.buildReadPlan(expected, record, fieldResults, idToConstant); | ||
|
|
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| return structReader(readPlan, partner.first(), expected); | ||
| } | ||
|
|
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| private ValueReader<?> structReader( | ||
| List<Pair<Integer, ValueReader<?>>> readPlan, int fieldId, Types.StructType struct) { | ||
|
|
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| Class<? extends StructLike> structClass = typeMap.get(fieldId); | ||
| if (structClass != null) { | ||
| return InternalReaders.struct(struct, structClass, readPlan); | ||
| } else { | ||
| return InternalReaders.struct(struct, readPlan); | ||
| } | ||
| } | ||
|
|
||
| @Override | ||
| public ValueReader<?> union( | ||
| Pair<Integer, Type> partner, Schema union, List<ValueReader<?>> options) { | ||
| return ValueReaders.union(options); | ||
| } | ||
|
|
||
| @Override | ||
| public ValueReader<?> arrayMap( | ||
| Pair<Integer, Type> partner, | ||
| Schema map, | ||
| ValueReader<?> keyReader, | ||
| ValueReader<?> valueReader) { | ||
| return ValueReaders.arrayMap(keyReader, valueReader); | ||
| } | ||
|
|
||
| @Override | ||
| public ValueReader<?> array( | ||
| Pair<Integer, Type> partner, Schema array, ValueReader<?> elementReader) { | ||
| return ValueReaders.array(elementReader); | ||
| } | ||
|
|
||
| @Override | ||
| public ValueReader<?> map(Pair<Integer, Type> partner, Schema map, ValueReader<?> valueReader) { | ||
| return ValueReaders.map(ValueReaders.strings(), valueReader); | ||
| } | ||
|
|
||
| @Override | ||
| public ValueReader<?> primitive(Pair<Integer, Type> partner, Schema primitive) { | ||
| LogicalType logicalType = primitive.getLogicalType(); | ||
| if (logicalType != null) { | ||
| switch (logicalType.getName()) { | ||
| case "date": | ||
| return ValueReaders.ints(); | ||
|
|
||
| case "time-micros": | ||
| return ValueReaders.longs(); | ||
|
|
||
| case "timestamp-millis": | ||
| // adjust to microseconds | ||
| ValueReader<Long> longs = ValueReaders.longs(); | ||
| return (ValueReader<Long>) (decoder, ignored) -> longs.read(decoder, null) * 1000L; | ||
|
|
||
| case "timestamp-micros": | ||
| return ValueReaders.longs(); | ||
|
|
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| case "decimal": | ||
| return ValueReaders.decimal( | ||
| ValueReaders.decimalBytesReader(primitive), | ||
| ((LogicalTypes.Decimal) logicalType).getScale()); | ||
|
|
||
| case "uuid": | ||
| return ValueReaders.uuids(); | ||
|
|
||
| default: | ||
| throw new IllegalArgumentException("Unknown logical type: " + logicalType); | ||
| } | ||
| } | ||
|
|
||
| switch (primitive.getType()) { | ||
| case NULL: | ||
| return ValueReaders.nulls(); | ||
| case BOOLEAN: | ||
| return ValueReaders.booleans(); | ||
| case INT: | ||
| if (partner != null && partner.second().typeId() == Type.TypeID.LONG) { | ||
| return ValueReaders.intsAsLongs(); | ||
| } | ||
| return ValueReaders.ints(); | ||
| case LONG: | ||
| return ValueReaders.longs(); | ||
| case FLOAT: | ||
| if (partner != null && partner.second().typeId() == Type.TypeID.DOUBLE) { | ||
| return ValueReaders.floatsAsDoubles(); | ||
| } | ||
| return ValueReaders.floats(); | ||
| case DOUBLE: | ||
| return ValueReaders.doubles(); | ||
| case STRING: | ||
| return ValueReaders.strings(); | ||
| case FIXED: | ||
| return ValueReaders.fixed(primitive); | ||
| case BYTES: | ||
| return ValueReaders.byteBuffers(); | ||
| case ENUM: | ||
| return ValueReaders.enums(primitive.getEnumSymbols()); | ||
| default: | ||
| throw new IllegalArgumentException("Unsupported type: " + primitive); | ||
| } | ||
| } | ||
| } | ||
|
|
||
| private static class AccessByID | ||
| implements AvroWithPartnerVisitor.PartnerAccessors<Pair<Integer, Type>> { | ||
| private static final AccessByID INSTANCE = new AccessByID(); | ||
|
|
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| public static AccessByID instance() { | ||
| return INSTANCE; | ||
| } | ||
|
|
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| @Override | ||
| public Pair<Integer, Type> fieldPartner( | ||
| Pair<Integer, Type> partner, Integer fieldId, String name) { | ||
| Types.NestedField field = partner.second().asStructType().field(fieldId); | ||
| return field != null ? Pair.of(field.fieldId(), field.type()) : null; | ||
| } | ||
|
|
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| @Override | ||
| public Pair<Integer, Type> mapKeyPartner(Pair<Integer, Type> partner) { | ||
| Types.MapType map = partner.second().asMapType(); | ||
| return Pair.of(map.keyId(), map.keyType()); | ||
| } | ||
|
|
||
| @Override | ||
| public Pair<Integer, Type> mapValuePartner(Pair<Integer, Type> partner) { | ||
| Types.MapType map = partner.second().asMapType(); | ||
| return Pair.of(map.valueId(), map.valueType()); | ||
| } | ||
|
|
||
| @Override | ||
| public Pair<Integer, Type> listElementPartner(Pair<Integer, Type> partner) { | ||
| Types.ListType list = partner.second().asListType(); | ||
| return Pair.of(list.elementId(), list.elementType()); | ||
| } | ||
| } | ||
| } |
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