[GitHub] [iceberg] rdblue commented on a change in pull request #1175: Flink: add flink row PartitionKey.

[GitBox <gi...@apache.org>]

rdblue commented on a change in pull request #1175:
URL: https://github.com/apache/iceberg/pull/1175#discussion_r454509064



##########
File path: flink/src/main/java/org/apache/iceberg/flink/RowWrapper.java
##########
@@ -0,0 +1,85 @@
+/*
+ * 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.lang.reflect.Array;
+import org.apache.flink.types.Row;
+import org.apache.iceberg.StructLike;
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Types;
+
+public class RowWrapper implements StructLike {
+
+  private final Type[] types;
+  private final PositionalGetter[] getters;
+  private Row row = null;
+
+  public RowWrapper(Types.StructType type) {
+    int size = type.fields().size();
+
+    types = (Type[]) Array.newInstance(Type.class, size);
+    for (int i = 0; i < size; i++) {
+      types[i] = type.fields().get(i).type();
+    }
+
+    getters = (PositionalGetter[]) Array.newInstance(PositionalGetter.class, size);
+    for (int i = 0; i < size; i++) {
+      getters[i] = buildGetter(types[i]);
+    }
+  }
+
+  RowWrapper wrap(Row data) {
+    this.row = data;
+    return this;
+  }
+
+  @Override
+  public int size() {
+    return types.length;
+  }
+
+  @Override
+  public <T> T get(int pos, Class<T> javaClass) {
+    if (row.getField(pos) == null) {
+      return null;
+    } else if (getters[pos] != null) {
+      return javaClass.cast(getters[pos].get(row, pos));
+    }
+
+    return javaClass.cast(row.getField(pos));
+  }
+
+  @Override
+  public <T> void set(int pos, T value) {
+    row.setField(pos, value);
+  }
+
+  private interface PositionalGetter<T> {
+    T get(Row row, int pos);
+  }
+
+  private static PositionalGetter buildGetter(Type type) {
+    if (type instanceof Types.StructType) {

Review comment:
       The objects returned by this wrapper need to be Iceberg's internal representation:
   * `int` for `DateType`: number of days from epoch
   * `long` for `TimeType`: number of microseconds from midnight
   * `long` for both `TimestampType`: number of microseconds from epoch
   * `ByteBuffer` for both `fixed(L)` and `binary` types
   * `BigDecimal` for `decimal(P, S)`
   
   Because we Flink uses the same in-memory representation as Iceberg generics, this should use the [same conversions](https://github.com/apache/iceberg/blob/master/data/src/main/java/org/apache/iceberg/data/InternalRecordWrapper.java#L46-L64) that we use for `Record`.




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