| /* |
| * 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.extensions.sql.meta.provider; |
| |
| import java.util.ArrayList; |
| import java.util.Arrays; |
| import java.util.List; |
| import org.apache.beam.sdk.schemas.FieldAccessDescriptor; |
| import org.apache.beam.sdk.schemas.Schema; |
| import org.apache.beam.sdk.schemas.io.PushdownProjector; |
| import org.apache.beam.sdk.schemas.io.SchemaIO; |
| import org.apache.beam.sdk.schemas.io.SchemaIOProvider; |
| import org.apache.beam.sdk.schemas.transforms.Select; |
| import org.apache.beam.sdk.transforms.Create; |
| 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.PInput; |
| import org.apache.beam.sdk.values.POutput; |
| import org.apache.beam.sdk.values.Row; |
| import org.apache.beam.vendor.guava.v26_0_jre.com.google.common.annotations.VisibleForTesting; |
| import org.checkerframework.checker.nullness.qual.Nullable; |
| |
| /** |
| * A mock {@link org.apache.beam.sdk.extensions.sql.meta.provider.SchemaIOTableProviderWrapper} that |
| * reads in-memory data for testing. |
| */ |
| @VisibleForTesting |
| public class TestSchemaIOTableProviderWrapper extends SchemaIOTableProviderWrapper { |
| private static final List<Row> rows = new ArrayList<>(); |
| |
| @Override |
| public SchemaIOProvider getSchemaIOProvider() { |
| return new TestSchemaIOProvider(); |
| } |
| |
| public static void addRows(Row... newRows) { |
| rows.addAll(Arrays.asList(newRows)); |
| } |
| |
| private class TestSchemaIOProvider implements SchemaIOProvider { |
| @Override |
| public String identifier() { |
| return "TestSchemaIOProvider"; |
| } |
| |
| @Override |
| public Schema configurationSchema() { |
| return Schema.of(); |
| } |
| |
| @Override |
| public SchemaIO from(String location, Row configuration, @Nullable Schema dataSchema) { |
| return new TestSchemaIO(dataSchema); |
| } |
| |
| @Override |
| public boolean requiresDataSchema() { |
| return true; |
| } |
| |
| @Override |
| public PCollection.IsBounded isBounded() { |
| return PCollection.IsBounded.BOUNDED; |
| } |
| } |
| |
| private class TestSchemaIO implements SchemaIO { |
| private final Schema schema; |
| |
| TestSchemaIO(Schema schema) { |
| this.schema = schema; |
| } |
| |
| @Override |
| public Schema schema() { |
| return schema; |
| } |
| |
| @Override |
| public PTransform<PBegin, PCollection<Row>> buildReader() { |
| // Read all fields by default. |
| return new TestPushdownProjector(schema, FieldAccessDescriptor.withAllFields()); |
| } |
| |
| @Override |
| public PTransform<PCollection<Row>, ? extends POutput> buildWriter() { |
| throw new UnsupportedOperationException(); |
| } |
| } |
| |
| /** |
| * {@link PTransform} that reads in-memory data for testing. Simulates projection pushdown using |
| * {@link Select}. |
| */ |
| private class TestPushdownProjector extends PTransform<PBegin, PCollection<Row>> |
| implements PushdownProjector { |
| /** The schema of the input data. */ |
| private final Schema schema; |
| /** The fields to be projected. */ |
| private final FieldAccessDescriptor fieldAccessDescriptor; |
| |
| TestPushdownProjector(Schema schema, FieldAccessDescriptor fieldAccessDescriptor) { |
| this.schema = schema; |
| this.fieldAccessDescriptor = fieldAccessDescriptor; |
| } |
| |
| @Override |
| public PTransform<? extends PInput, PCollection<Row>> withProjectionPushdown( |
| FieldAccessDescriptor fieldAccessDescriptor) { |
| return new TestPushdownProjector(schema, fieldAccessDescriptor); |
| } |
| |
| @Override |
| public boolean supportsFieldReordering() { |
| return true; |
| } |
| |
| @Override |
| public PCollection<Row> expand(PBegin input) { |
| // Simulate projection pushdown using Select. In a real IO, projection would be pushed down to |
| // the source. |
| return input |
| .apply(Create.of(rows).withRowSchema(schema)) |
| .apply(Select.fieldAccess(fieldAccessDescriptor)); |
| } |
| } |
| } |