damondouglas commented on a change in pull request #17181: URL: https://github.com/apache/beam/pull/17181#discussion_r835655245
########## File path: sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQuerySchemaTransformReadProvider.java ########## @@ -0,0 +1,176 @@ +/* + * 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.gcp.bigquery; + +import com.google.api.services.bigquery.model.TableRow; +import java.util.Collections; +import java.util.List; +import java.util.Objects; +import org.apache.beam.sdk.annotations.Experimental; +import org.apache.beam.sdk.annotations.Experimental.Kind; +import org.apache.beam.sdk.annotations.Internal; +import org.apache.beam.sdk.io.gcp.bigquery.BigQuerySchemaTransformReadConfiguration.JobType; +import org.apache.beam.sdk.schemas.Schema; +import org.apache.beam.sdk.schemas.io.InvalidConfigurationException; +import org.apache.beam.sdk.schemas.transforms.SchemaTransform; +import org.apache.beam.sdk.schemas.transforms.TypedSchemaTransformProvider; +import org.apache.beam.sdk.transforms.MapElements; +import org.apache.beam.sdk.transforms.PTransform; +import org.apache.beam.sdk.values.PCollection; +import org.apache.beam.sdk.values.PCollectionRowTuple; +import org.apache.beam.sdk.values.Row; +import org.apache.beam.sdk.values.TypeDescriptor; + +/** + * An implementation of {@link TypedSchemaTransformProvider} for BigQuery read jobs configured using + * {@link BigQuerySchemaTransformReadConfiguration}. + * + * <p><b>Internal only:</b> This class is actively being worked on, and it will likely change. We + * provide no backwards compatibility guarantees, and it should not be implemented outside the Beam + * repository. + */ +@Internal +@Experimental(Kind.SCHEMAS) +public class BigQuerySchemaTransformReadProvider + extends TypedSchemaTransformProvider<BigQuerySchemaTransformReadConfiguration> { + + private static final String API = "bigquery"; + private static final String VERSION = "v2"; + private static final String OUTPUT_TAG = "OUTPUT"; + + /** Returns the expected class of the configuration. */ + @Override + protected Class<BigQuerySchemaTransformReadConfiguration> configurationClass() { + return BigQuerySchemaTransformReadConfiguration.class; + } + + /** Returns the expected {@link SchemaTransform} of the configuration. */ + @Override + protected SchemaTransform from(BigQuerySchemaTransformReadConfiguration configuration) { + return new BigQuerySchemaTransformRead(configuration); + } + + /** Implementation of the {@link TypedSchemaTransformProvider} identifier method. */ + @Override + public String identifier() { + return String.format("%s:%s", API, VERSION); + } + + /** + * Implementation of the {@link TypedSchemaTransformProvider} inputCollectionNames method. Since + * no input is expected, this returns an empty list. + */ + @Override + public List<String> inputCollectionNames() { + return Collections.emptyList(); + } + + /** + * Implementation of the {@link TypedSchemaTransformProvider} outputCollectionNames method. Since + * a single output is expected, this returns a list with a single name. + */ + @Override + public List<String> outputCollectionNames() { + return Collections.singletonList(OUTPUT_TAG); + } + + /** + * An implementation of {@link SchemaTransform} for BigQuery read jobs configured using {@link + * BigQuerySchemaTransformReadConfiguration}. + */ + static class BigQuerySchemaTransformRead implements SchemaTransform { + private final BigQuerySchemaTransformReadConfiguration configuration; + + BigQuerySchemaTransformRead(BigQuerySchemaTransformReadConfiguration configuration) { + this.configuration = configuration; + } + + /** Implements {@link SchemaTransform} buildTransform method. */ + @Override + public PTransform<PCollectionRowTuple, PCollectionRowTuple> buildTransform() { + return new BigQuerySchemaTransformReadTransform(configuration); + } + } + + /** + * An implementation of {@link PTransform} for BigQuery read jobs configured using {@link + * BigQuerySchemaTransformReadConfiguration}. + */ + static class BigQuerySchemaTransformReadTransform + extends PTransform<PCollectionRowTuple, PCollectionRowTuple> { + private final BigQuerySchemaTransformReadConfiguration configuration; + + BigQuerySchemaTransformReadTransform(BigQuerySchemaTransformReadConfiguration configuration) { + this.configuration = configuration; + } + + @Override + public PCollectionRowTuple expand(PCollectionRowTuple input) { + if (!input.getAll().isEmpty()) { + throw new IllegalArgumentException( + String.format( + "%s %s input is expected to be empty", + input.getClass().getSimpleName(), getClass().getSimpleName())); + } + PCollection<TableRow> tableRowPCollection = input.getPipeline().apply(toTypedRead()); + Schema schema = tableRowPCollection.getSchema(); + PCollection<Row> rowPCollection = + tableRowPCollection.apply( + MapElements.into(TypeDescriptor.of(Row.class)) + .via((tableRow) -> BigQueryUtils.toBeamRow(schema, tableRow))); + return PCollectionRowTuple.of(OUTPUT_TAG, rowPCollection); + } + + BigQueryIO.TypedRead<TableRow> toTypedRead() { + JobType jobType = configuration.getJobType(); + switch (jobType) { + case QUERY: + return toQueryTypedRead(); + + case EXTRACT: + return toExtractTypedRead(); + + default: + throw new InvalidConfigurationException( + String.format("invalid job type for BigQueryIO read, got: %s", jobType)); + } + } + + private BigQueryIO.TypedRead<TableRow> toExtractTypedRead() { + return BigQueryIO.readTableRowsWithSchema().from(configuration.getTableSpec()); + } + + private BigQueryIO.TypedRead<TableRow> toQueryTypedRead() { Review comment: Should I add the following annotation? ``` @SuppressWarnings({ "nullness" // TODO(https://issues.apache.org/jira/browse/BEAM-10402) }) ``` -- 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. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
