openinx commented on a change in pull request #1293:
URL: https://github.com/apache/iceberg/pull/1293#discussion_r469806393



##########
File path: flink/src/main/java/org/apache/iceberg/flink/CatalogLoader.java
##########
@@ -0,0 +1,45 @@
+/*
+ * 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.iceberg.flink;
+
+import java.io.Serializable;
+import org.apache.hadoop.conf.Configuration;
+import org.apache.iceberg.Table;
+import org.apache.iceberg.catalog.Catalog;
+import org.apache.iceberg.hadoop.HadoopCatalog;
+import org.apache.iceberg.hive.HiveCatalog;
+
+/**
+ * Serializable loader to load an Iceberg {@link Catalog}.
+ * Flink needs to get {@link Table} objects in the cluster (for example, to 
get splits), not just on the client side.
+ * So we need an Iceberg catalog loader to get the {@link Catalog} and get the 
{@link Table} object.
+ */
+public interface CatalogLoader extends Serializable {

Review comment:
       Seems we could move this class to hive modules ? 

##########
File path: flink/src/test/java/org/apache/iceberg/flink/data/RandomData.java
##########
@@ -88,6 +93,34 @@ public Row next() {
     };
   }
 
+  private static Iterable<RowData> generateRowData(Schema schema, int 
numRecords,

Review comment:
       We will remove this `RandomData` class in the future (Once RowData 
parquet reader & writer is ready),   we've already had the `RandomRowData` to 
generate `Iterable<RowData>`, you may want to rebase master branch now.  (so we 
don't have to define a `generateRowData` here now).
   It will generate `Record` firstly, then convert them into `RowData`, in this 
way we could assert the RowData with Record,  it can be more rigorous to 
determine the correctness of the data.

##########
File path: data/src/test/java/org/apache/iceberg/TestAppendHelper.java
##########
@@ -0,0 +1,128 @@
+/*
+ * 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.iceberg;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+import org.apache.iceberg.avro.Avro;
+import org.apache.iceberg.data.Record;
+import org.apache.iceberg.data.avro.DataWriter;
+import org.apache.iceberg.data.orc.GenericOrcWriter;
+import org.apache.iceberg.data.parquet.GenericParquetWriter;
+import org.apache.iceberg.io.FileAppender;
+import org.apache.iceberg.orc.ORC;
+import org.apache.iceberg.parquet.Parquet;
+import org.apache.iceberg.relocated.com.google.common.base.Preconditions;
+import org.junit.Assert;
+import org.junit.rules.TemporaryFolder;
+
+public class TestAppendHelper {
+
+  private final Table table;
+  private final FileFormat fileFormat;
+  private final TemporaryFolder tmp;
+
+  public TestAppendHelper(Table table, FileFormat fileFormat, TemporaryFolder 
tmp) {
+    this.table = table;
+    this.fileFormat = fileFormat;
+    this.tmp = tmp;
+  }
+
+  public void appendToTable(DataFile... dataFiles) {
+    Preconditions.checkNotNull(table, "table not set");
+
+    AppendFiles append = table.newAppend();
+
+    for (DataFile dataFile : dataFiles) {
+      append = append.appendFile(dataFile);
+    }
+
+    append.commit();
+  }
+
+  public void appendToTable(List<Record> records) throws IOException {
+    appendToTable(null, records);
+  }
+
+  public void appendToTable(StructLike partition, List<Record> records) throws 
IOException {
+    appendToTable(writeFile(partition, records));
+  }
+
+  public DataFile writeFile(StructLike partition, List<Record> records) throws 
IOException {
+    Preconditions.checkNotNull(table, "table not set");
+    return writeFile(table, partition, records, fileFormat, tmp.newFile());
+  }
+
+  public static DataFile writeFile(
+      Table table, StructLike partition, List<Record> records, FileFormat 
fileFormat,
+      File file) throws IOException {
+    Assert.assertTrue(file.delete());
+
+    FileAppender<Record> appender;
+
+    switch (fileFormat) {
+      case AVRO:
+        appender = Avro.write(Files.localOutput(file))
+            .schema(table.schema())
+            .createWriterFunc(DataWriter::create)
+            .named(fileFormat.name())
+            .build();
+        break;
+
+      case PARQUET:
+        appender = Parquet.write(Files.localOutput(file))
+            .schema(table.schema())
+            .createWriterFunc(GenericParquetWriter::buildWriter)
+            .named(fileFormat.name())
+            .build();
+        break;
+
+      case ORC:
+        appender = ORC.write(Files.localOutput(file))
+            .schema(table.schema())
+            .createWriterFunc(GenericOrcWriter::buildWriter)
+            .build();
+        break;
+
+      default:
+        throw new UnsupportedOperationException("Cannot write format: " + 
fileFormat);
+    }
+
+    try {
+      appender.addAll(records);
+    } finally {
+      appender.close();
+    }

Review comment:
       Seems we could abstract those appender building into a separate method,  
I saw lots of unit tests depend on this common logics, could be a separate 
issue to do this.




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