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Avro: Add writers for the internal object model (#11919)
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116
core/src/main/java/org/apache/iceberg/avro/BaseWriteBuilder.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,116 @@ | ||
| /* | ||
| * 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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| import java.util.List; | ||
| import org.apache.avro.LogicalType; | ||
| import org.apache.avro.LogicalTypes; | ||
| import org.apache.avro.Schema; | ||
| import org.apache.iceberg.relocated.com.google.common.base.Preconditions; | ||
|
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| abstract class BaseWriteBuilder extends AvroSchemaVisitor<ValueWriter<?>> { | ||
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| protected abstract ValueWriter<?> createRecordWriter(List<ValueWriter<?>> fields); | ||
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| protected abstract ValueWriter<?> fixedWriter(int length); | ||
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| @Override | ||
| public ValueWriter<?> record(Schema record, List<String> names, List<ValueWriter<?>> fields) { | ||
| return createRecordWriter(fields); | ||
| } | ||
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| @Override | ||
| public ValueWriter<?> union(Schema union, List<ValueWriter<?>> options) { | ||
| Preconditions.checkArgument( | ||
| options.size() == 2, "Cannot create writer for non-option union: %s", union); | ||
| if (union.getTypes().get(0).getType() == Schema.Type.NULL) { | ||
| return ValueWriters.option(0, options.get(1)); | ||
| } else if (union.getTypes().get(1).getType() == Schema.Type.NULL) { | ||
| return ValueWriters.option(1, options.get(0)); | ||
| } else { | ||
| throw new IllegalArgumentException( | ||
| String.format("Cannot create writer for non-option union: %s", union)); | ||
| } | ||
| } | ||
|
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| @Override | ||
| public ValueWriter<?> array(Schema array, ValueWriter<?> elementWriter) { | ||
| if (array.getLogicalType() instanceof LogicalMap) { | ||
| ValueWriters.StructWriter<?> keyValueWriter = (ValueWriters.StructWriter<?>) elementWriter; | ||
| return ValueWriters.arrayMap(keyValueWriter.writer(0), keyValueWriter.writer(1)); | ||
| } | ||
|
|
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| return ValueWriters.array(elementWriter); | ||
| } | ||
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| @Override | ||
| public ValueWriter<?> map(Schema map, ValueWriter<?> valueWriter) { | ||
| return ValueWriters.map(ValueWriters.strings(), valueWriter); | ||
| } | ||
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| @Override | ||
| public ValueWriter<?> primitive(Schema primitive) { | ||
| LogicalType logicalType = primitive.getLogicalType(); | ||
| if (logicalType != null) { | ||
| switch (logicalType.getName()) { | ||
| case "date": | ||
| return ValueWriters.ints(); | ||
|
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| case "time-micros": | ||
| return ValueWriters.longs(); | ||
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| case "timestamp-micros": | ||
| return ValueWriters.longs(); | ||
|
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| case "decimal": | ||
| LogicalTypes.Decimal decimal = (LogicalTypes.Decimal) logicalType; | ||
| return ValueWriters.decimal(decimal.getPrecision(), decimal.getScale()); | ||
|
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| case "uuid": | ||
| return ValueWriters.uuids(); | ||
|
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| default: | ||
| throw new IllegalArgumentException("Unsupported logical type: " + logicalType); | ||
| } | ||
| } | ||
|
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| switch (primitive.getType()) { | ||
| case NULL: | ||
| return ValueWriters.nulls(); | ||
| case BOOLEAN: | ||
| return ValueWriters.booleans(); | ||
| case INT: | ||
| return ValueWriters.ints(); | ||
| case LONG: | ||
| return ValueWriters.longs(); | ||
| case FLOAT: | ||
| return ValueWriters.floats(); | ||
| case DOUBLE: | ||
| return ValueWriters.doubles(); | ||
| case STRING: | ||
| return ValueWriters.strings(); | ||
| case FIXED: | ||
| return fixedWriter(primitive.getFixedSize()); | ||
| case BYTES: | ||
| return ValueWriters.byteBuffers(); | ||
| default: | ||
| throw new IllegalArgumentException("Unsupported type: " + primitive); | ||
| } | ||
| } | ||
| } |
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74 changes: 74 additions & 0 deletions
74
core/src/main/java/org/apache/iceberg/avro/InternalWriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,74 @@ | ||
| /* | ||
| * 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.stream.Stream; | ||
| import org.apache.avro.Schema; | ||
| import org.apache.avro.io.Encoder; | ||
| import org.apache.iceberg.FieldMetrics; | ||
| import org.apache.iceberg.types.Type; | ||
|
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| /** | ||
| * A Writer that consumes Iceberg's internal in-memory object model. | ||
| * | ||
| * <p>Iceberg's internal in-memory object model produces the types defined in {@link | ||
| * Type.TypeID#javaClass()}. | ||
| */ | ||
| public class InternalWriter<T> implements MetricsAwareDatumWriter<T> { | ||
| private ValueWriter<T> writer = null; | ||
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| public static <D> InternalWriter<D> create(Schema schema) { | ||
| return new InternalWriter<>(schema); | ||
| } | ||
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| InternalWriter(Schema schema) { | ||
| setSchema(schema); | ||
| } | ||
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| @Override | ||
| @SuppressWarnings("unchecked") | ||
| public void setSchema(Schema schema) { | ||
| this.writer = (ValueWriter<T>) AvroSchemaVisitor.visit(schema, new WriteBuilder()); | ||
| } | ||
|
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| @Override | ||
| public void write(T datum, Encoder out) throws IOException { | ||
| writer.write(datum, out); | ||
| } | ||
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| @Override | ||
| public Stream<FieldMetrics> metrics() { | ||
| return writer.metrics(); | ||
| } | ||
|
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| private static class WriteBuilder extends BaseWriteBuilder { | ||
|
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| @Override | ||
| protected ValueWriter<?> createRecordWriter(List<ValueWriter<?>> fields) { | ||
| return ValueWriters.struct(fields); | ||
| } | ||
|
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| @Override | ||
| protected ValueWriter<?> fixedWriter(int length) { | ||
| return ValueWriters.fixedBuffers(length); | ||
| } | ||
| } | ||
| } |
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