tests

sdks/java/core/src/main/java/org/apache/beam/sdk/schemas/transforms/SchemaTransform.java

@@ -24,6 +24,7 @@
 import javax.annotation.Nullable;
 import org.apache.beam.sdk.annotations.Internal;
 import org.apache.beam.sdk.schemas.NoSuchSchemaException;
+import org.apache.beam.sdk.schemas.Schema;
 import org.apache.beam.sdk.schemas.SchemaRegistry;
 import org.apache.beam.sdk.transforms.PTransform;
 import org.apache.beam.sdk.values.PCollectionRowTuple;
@@ -61,8 +62,14 @@ protected SchemaTransform(ConfigT configuration, String identifier) {
     Class<ConfigT> typedClass = (Class<ConfigT>) parameterizedType.getActualTypeArguments()[0];
 
     try {
+      // Get initial row with values
+      Row row = SchemaRegistry.createDefault().getToRowFunction(typedClass).apply(configuration);
+      // Get sorted Schema and recreate the Row
+      Schema configurationSchema = SchemaRegistry.createDefault().getSchema(typedClass).sorted();
       this.configurationRow =
-          SchemaRegistry.createDefault().getToRowFunction(typedClass).apply(configuration);
+          configurationSchema.getFields().stream()
+              .map(field -> row.getValue(field.getName()))
+              .collect(Row.toRow(configurationSchema));
     } catch (NoSuchSchemaException e) {
       throw new RuntimeException("Unable to find schema for this SchemaTransform's config.", e);
     }

sdks/java/core/src/test/java/org/apache/beam/sdk/schemas/transforms/SchemaTransformProviderTranslationTest.java

@@ -0,0 +1,78 @@
+/*
+ * 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.schemas.transforms;
+
+import static org.apache.beam.sdk.schemas.transforms.SchemaTransformProviderTranslation.SchemaTransformTranslator;
+import static org.junit.Assert.assertEquals;
+
+import java.util.Arrays;
+import org.apache.beam.sdk.options.PipelineOptionsFactory;
+import org.apache.beam.sdk.schemas.transforms.providers.FlattenTransformProvider;
+import org.apache.beam.sdk.schemas.transforms.providers.JavaExplodeTransformProvider;
+import org.apache.beam.sdk.schemas.transforms.providers.LoggingTransformProvider;
+import org.apache.beam.sdk.values.Row;
+import org.junit.Test;
+
+public class SchemaTransformProviderTranslationTest {
+  public void translateAndRunChecks(SchemaTransformProvider provider, Row originalRow) {
+    SchemaTransform<?> transform = provider.from(originalRow);
+
+    SchemaTransformTranslator translator = new SchemaTransformTranslator(provider.identifier());
+    Row rowFromTransform = translator.toConfigRow(transform);
+
+    SchemaTransform<?> transformFromRow =
+        translator.fromConfigRow(rowFromTransform, PipelineOptionsFactory.create());
+
+    assertEquals(originalRow, rowFromTransform);
+    assertEquals(originalRow, transformFromRow.getConfigurationRow());
+    assertEquals(
+        provider.configurationSchema(), transformFromRow.getConfigurationRow().getSchema());
+    assertEquals(provider.identifier(), transformFromRow.getIdentifier());
+  }
+
+  @Test
+  public void testReCreateJavaExplodeTransform() {
+    JavaExplodeTransformProvider provider = new JavaExplodeTransformProvider();
+
+    Row originalRow =
+        Row.withSchema(provider.configurationSchema())
+            .withFieldValue("crossProduct", true)
+            .withFieldValue("fields", Arrays.asList("a", "c"))
+            .build();
+
+    translateAndRunChecks(provider, originalRow);
+  }
+
+  @Test
+  public void testReCreateFlattenTransform() {
+    FlattenTransformProvider provider = new FlattenTransformProvider();
+    Row originalRow = Row.withSchema(provider.configurationSchema()).build();
+    translateAndRunChecks(provider, originalRow);
+  }
+
+  @Test
+  public void testReCreateLoggingTransform() {
+    LoggingTransformProvider provider = new LoggingTransformProvider();
+    Row originalRow =
+        Row.withSchema(provider.configurationSchema())
+            .withFieldValue("level", "INFO")
+            .withFieldValue("prefix", "some_prefix")
+            .build();
+    translateAndRunChecks(provider, originalRow);
+  }
+}