damondouglas commented on a change in pull request #17181: URL: https://github.com/apache/beam/pull/17181#discussion_r841097703
########## File path: sdks/java/io/google-cloud-platform/src/main/java/org/apache/beam/sdk/io/gcp/bigquery/BigQuerySchemaTransformWriteProvider.java ########## @@ -0,0 +1,152 @@ +/* + * 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 com.google.api.services.bigquery.model.TableSchema; +import java.util.Collections; +import java.util.List; +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.BigQueryIO.Write.CreateDisposition; +import org.apache.beam.sdk.io.gcp.bigquery.BigQueryIO.Write.WriteDisposition; +import org.apache.beam.sdk.schemas.Schema; +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 write jobs configured + * using {@link BigQuerySchemaTransformWriteConfiguration}. + * + * <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 BigQuerySchemaTransformWriteProvider + extends TypedSchemaTransformProvider<BigQuerySchemaTransformWriteConfiguration> { + + private static final String API = "bigquery"; + private static final String VERSION = "v2"; + private static final String INPUT_TAG = "INPUT"; + + /** Returns the expected class of the configuration. */ + @Override + protected Class<BigQuerySchemaTransformWriteConfiguration> configurationClass() { + return BigQuerySchemaTransformWriteConfiguration.class; + } + + /** Returns the expected {@link SchemaTransform} of the configuration. */ + @Override + protected SchemaTransform from(BigQuerySchemaTransformWriteConfiguration configuration) { + return new BigQueryWriteSchemaTransform(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 a + * single is expected, this returns a list with a single name. + */ + @Override + public List<String> inputCollectionNames() { + return Collections.singletonList(INPUT_TAG); + } + + /** + * Implementation of the {@link TypedSchemaTransformProvider} outputCollectionNames method. Since + * no output is expected, this returns an empty list. + */ + @Override + public List<String> outputCollectionNames() { + return Collections.emptyList(); + } + + /** + * An implementation of {@link SchemaTransform} for BigQuery write jobs configured using {@link + * BigQuerySchemaTransformWriteConfiguration}. + */ + static class BigQueryWriteSchemaTransform implements SchemaTransform { + private final BigQuerySchemaTransformWriteConfiguration configuration; + + BigQueryWriteSchemaTransform(BigQuerySchemaTransformWriteConfiguration configuration) { + this.configuration = configuration; + } + + @Override + public PTransform<PCollectionRowTuple, PCollectionRowTuple> buildTransform() { + return new BigQuerySchemaTransformWriteTransform(configuration); + } + } + + /** + * An implementation of {@link PTransform} for BigQuery write jobs configured using {@link + * BigQuerySchemaTransformWriteConfiguration}. + */ + static class BigQuerySchemaTransformWriteTransform + extends PTransform<PCollectionRowTuple, PCollectionRowTuple> { + private final BigQuerySchemaTransformWriteConfiguration configuration; + + BigQuerySchemaTransformWriteTransform(BigQuerySchemaTransformWriteConfiguration configuration) { + this.configuration = configuration; + } + + @Override + public PCollectionRowTuple expand(PCollectionRowTuple input) { + if (!input.has(INPUT_TAG)) { + throw new IllegalArgumentException( + String.format( + "%s %s is missing expected tag: %s", + getClass().getSimpleName(), input.getClass().getSimpleName(), INPUT_TAG)); + } + PCollection<Row> rowPCollection = input.get(INPUT_TAG); + Schema schema = rowPCollection.getSchema(); + PCollection<TableRow> tableRowPCollection = + rowPCollection.apply( + MapElements.into(TypeDescriptor.of(TableRow.class)).via(BigQueryUtils::toTableRow)); + tableRowPCollection.apply(toWrite(schema)); Review comment: I will actually address checking the alignment of the Schema with the table, if it exists, in this PR. I agree. -- 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]
