[GitHub] [hive] lcspinter commented on a change in pull request #2333: HIVE-25179: Support all partition transforms for Iceberg in create table

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lcspinter commented on a change in pull request #2333:
URL: https://github.com/apache/hive/pull/2333#discussion_r643744591



##########
File path: ql/src/java/org/apache/hadoop/hive/ql/parse/PartitionTransform.java
##########
@@ -0,0 +1,79 @@
+/*
+ * 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.hadoop.hive.ql.parse;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Map;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
+
+public class PartitionTransform {
+
+  private static final Map<Integer, TransformTypes> TRANSFORMS = Stream
+      .of(new Object[][] { { HiveParser.TOK_IDENTITY, TransformTypes.IDENTITY },
+          { HiveParser.TOK_YEAR, TransformTypes.YEAR }, { HiveParser.TOK_MONTH, TransformTypes.MONTH },
+          { HiveParser.TOK_DAY, TransformTypes.DAY }, { HiveParser.TOK_HOUR, TransformTypes.HOUR },
+          { HiveParser.TOK_TRUNCATE, TransformTypes.TRUNCATE }, { HiveParser.TOK_BUCKET, TransformTypes.BUCKET } })
+      .collect(Collectors.toMap(e -> (Integer) e[0], e -> (TransformTypes) e[1]));
+
+  /**
+   * Parse the partition transform specifications from the AST Tree node.
+   * @param node AST Tree node, must be not null
+   * @return list of partition transforms
+   */
+  public static List<PartitionTransformSpec> getPartitionTransformSpec(ASTNode node) {
+    List<PartitionTransformSpec> partSpecList = new ArrayList<>();
+    for (int i = 0; i < node.getChildCount(); i++) {
+      PartitionTransformSpec spec = new PartitionTransformSpec();
+      ASTNode child = (ASTNode) node.getChild(i);
+      for (int j = 0; j < child.getChildCount(); j++) {
+        ASTNode grandChild = (ASTNode) child.getChild(j);
+        switch (grandChild.getToken().getType()) {
+        case HiveParser.TOK_IDENTITY:
+        case HiveParser.TOK_YEAR:
+        case HiveParser.TOK_MONTH:
+        case HiveParser.TOK_DAY:
+        case HiveParser.TOK_HOUR:
+          spec.transformType = TRANSFORMS.get(grandChild.getToken().getType());
+          break;
+        case HiveParser.TOK_TRUNCATE:
+        case HiveParser.TOK_BUCKET:
+          spec.transformType = TRANSFORMS.get(grandChild.getToken().getType());
+          spec.transformParam = Integer.valueOf(grandChild.getChild(0).getText());
+          break;
+        default:
+          spec.name = grandChild.getText();
+        }
+      }
+      partSpecList.add(spec);
+    }
+
+    return partSpecList;
+  }
+
+  public enum TransformTypes {

Review comment:
       Fixed.




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