robinyqiu commented on a change in pull request #12202: URL: https://github.com/apache/beam/pull/12202#discussion_r456726616
########## File path: sdks/java/core/src/main/java/org/apache/beam/sdk/io/AvroSchemaCapableIOProvider.java ########## @@ -0,0 +1,127 @@ +/* + * 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.beam.sdk.io; + +import com.google.auto.service.AutoService; +import java.io.Serializable; +import org.apache.avro.generic.GenericRecord; +import org.apache.beam.sdk.annotations.Internal; +import org.apache.beam.sdk.schemas.Schema; +import org.apache.beam.sdk.schemas.io.SchemaIO; +import org.apache.beam.sdk.schemas.io.SchemaIOProvider; +import org.apache.beam.sdk.schemas.transforms.Convert; +import org.apache.beam.sdk.schemas.utils.AvroUtils; +import org.apache.beam.sdk.transforms.PTransform; +import org.apache.beam.sdk.values.PBegin; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.PDone; +import org.apache.beam.sdk.values.POutput; +import org.apache.beam.sdk.values.Row; + +/** + * An implementation of {@link SchemaIOProvider} for reading and writing Avro files with {@link + * AvroIO}. + */ +@Internal +@AutoService(SchemaIOProvider.class) +public class AvroSchemaCapableIOProvider implements SchemaIOProvider { + /** Returns an id that uniquely represents this IO. */ + @Override + public String identifier() { + return "avro"; + } + + /** + * Returns the expected schema of the configuration object. Note this is distinct from the schema + * of the data source itself. No configuration expected for Avro. + */ + @Override + public Schema configurationSchema() { + return Schema.builder().build(); + } + + /** + * Produce a SchemaIO given a String representing the data's location, the schema of the data that + * resides there, and some IO-specific configuration object. + */ + @Override + public AvroSchemaIO from(String location, Row configuration, Schema dataSchema) { + return new AvroSchemaIO(location, dataSchema); + } + + @Override + public boolean requiresDataSchema() { + return true; + } + + @Override + public PCollection.IsBounded isBounded() { + return PCollection.IsBounded.BOUNDED; + } + + /** An abstraction to create schema aware IOs. */ + @Internal + private static class AvroSchemaIO implements SchemaIO, Serializable { + protected final Schema dataSchema; + protected final String location; + + private AvroSchemaIO(String location, Schema dataSchema) { + this.dataSchema = dataSchema; + this.location = location; + } + + @Override + public Schema schema() { + return dataSchema; + } + + @Override + public PTransform<PBegin, PCollection<Row>> buildReader() { + return new PTransform<PBegin, PCollection<Row>>() { + @Override + public PCollection<Row> expand(PBegin begin) { + return begin + .apply( + "AvroIORead", + AvroIO.readGenericRecords(AvroUtils.toAvroSchema(dataSchema, null, null)) Review comment: This PR changes the behavior of this line, from setting the second parameter using table name to null. How will this affect the behavior of AvroIO? ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org
