[GitHub] [iceberg] rdblue commented on a diff in pull request #5120: Flink: add sql partition functions

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

rdblue commented on code in PR #5120:
URL: https://github.com/apache/iceberg/pull/5120#discussion_r915209596


##########
flink/v1.15/flink/src/main/java/org/apache/iceberg/flink/sink/PartitionTransformUdf.java:
##########
@@ -0,0 +1,159 @@
+/*
+ * 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 Licenet ideajoinet ideajoin for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+package org.apache.iceberg.flink.sink;
+
+import java.math.BigDecimal;
+import java.nio.ByteBuffer;
+import java.time.Instant;
+import java.time.LocalDate;
+import java.time.LocalDateTime;
+import java.time.LocalTime;
+import java.time.ZoneOffset;
+import java.util.Optional;
+import java.util.concurrent.TimeUnit;
+import org.apache.flink.table.annotation.DataTypeHint;
+import org.apache.flink.table.api.DataTypes;
+import org.apache.flink.table.catalog.DataTypeFactory;
+import org.apache.flink.table.functions.ScalarFunction;
+import org.apache.flink.table.types.inference.TypeInference;
+import org.apache.flink.table.types.logical.LogicalTypeRoot;
+import org.apache.iceberg.transforms.Transform;
+import org.apache.iceberg.transforms.Transforms;
+import org.apache.iceberg.types.Types;
+
+public class PartitionTransformUdf {
+
+  public static class Truncate extends ScalarFunction {
+
+    public int eval(int num, int value) {
+      Transform<Integer, Integer> truncate = Transforms.truncate(Types.IntegerType.get(), num);
+      return truncate.apply(value);
+    }
+
+    public long eval(int num, long value) {
+      Transform<Long, Long> truncate = Transforms.truncate(Types.LongType.get(), num);
+      return truncate.apply(value);
+    }
+
+    public String eval(int num, String value) {
+      Transform<String, String> truncate = Transforms.truncate(Types.StringType.get(), num);

Review Comment:
   Can you make these constants rather than looking them up each time?



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